SARS-CoV2 in public spaces in West London, UK during COVID-19 pandemic.

BACKGROUND: Spread of SARS-CoV2 by aerosol is considered an important mode of transmission over distances >2 m, particularly indoors. OBJECTIVES: We determined whether SARS-CoV2 could be detected in the air of enclosed/semi-enclosed public spaces. METHODS AND ANALYSIS: Between March 2021 and December 2021 during the easing of COVID-19 pandemic restrictions after a period of lockdown, we used total suspended and size-segregated particulate matter (PM) samplers for the detection of SARS-CoV2 in hospitals wards and waiting areas, on public transport, in a university campus and in a primary school in West London. RESULTS: We collected 207 samples, of which 20 (9.7%) were positive for SARS-CoV2 using quantitative PCR. Positive samples were collected from hospital patient waiting areas, from hospital wards treating patients with COVID-19 using stationary samplers and from train carriages in London underground using personal samplers. Mean virus concentrations varied between 429 500 copies/m3 in the hospital emergency waiting area and the more frequent 164 000 copies/m3 found in other areas. There were more frequent positive samples from PM samplers in the PM2.5 fractions compared with PM10 and PM1. Culture on Vero cells of all collected samples gave negative results. CONCLUSION: During a period of partial opening during the COVID-19 pandemic in London, we detected SARS-CoV2 RNA in the air of hospital waiting areas and wards and of London Underground train carriage. More research is needed to determine the transmission potential of SARS-CoV2 detected in the air.

Impact of the COVID-19 pandemic on young people from black and mixed ethnic groups' mental health in West London: a qualitative study.

OBJECTIVES: The COVID-19 pandemic has disproportionately impacted vulnerable groups' physical and mental health, especially young people and minority ethnic groups, yet little is known about the crux of their experiences and what support they would like. To address this gap, this qualitative study aims to uncover the effect of the COVID-19 outbreak on young people with ethnic minority backgrounds' mental health, how this changed since the end of lockdown and what support they need to cope with these issues. DESIGN: The study utilised semi-structured interviews to conduct a phenomenological analysis. SETTING: Community centre in West London, England. PARTICIPANTS: Ten 15 min in-person semistructured interviews were conducted with young people aged 12-17 years old from black and mixed ethnic groups who regularly attend the community centre. RESULTS: Through Interpretative Phenomenological Analysis, results indicated that the participants' mental health was negatively impacted by the COVID-19 pandemic, with feelings of loneliness being the most common experience. However, positive effects were concurrently observed including improved well-being and better coping strategies post lockdown, which is a testament to the young people's resilience. That said, it is clear that young people from minority ethnic backgrounds lacked support during the COVID-19 pandemic and would now need psychological, practical and relational assistance to cope with these challenges. CONCLUSIONS: While future studies would benefit from a larger ethnically diverse sample, this is a start. Study findings have the potential to inform future government policies around mental health support and access for young people from ethnic minority groups, notably prioritising support for grassroots initiatives during times of crisis.

Twitter mobility dynamics during the COVID-19 pandemic: A case study of London.

The current COVID-19 pandemic has profoundly impacted people's lifestyles and travel behaviours, which may persist post-pandemic. An effective monitoring tool that allows us to track the level of change is vital for controlling viral transmission, predicting travel and activity demand and, in the long term, for economic recovery. In this paper, we propose a set of Twitter mobility indices to explore and visualise changes in people's travel and activity patterns, demonstrated through a case study of London. We collected over 2.3 million geotagged tweets in the Great London Area (GLA) from Jan 2019 -Feb 2021. From these, we extracted daily trips, origin-destination matrices, and spatial networks. Mobility indices were computed based on these, with the year 2019 as a pre-Covid baseline. We found that in London, (1) People are making fewer but longer trips since March 2020. (2) In 2020, travellers showed comparatively reduced interest in central and sub-central activity locations compared to those in outer areas, whereas, in 2021, there is a sign of a return to the old norm. (3) Contrary to some relevant literature on mobility and virus transmission, we found a poor spatial relationship at the Middle Layer Super Output Area (MSOA) level between reported COVID-19 cases and Twitter mobility. It indicated that daily trips detected from geotweets and their most likely associated social, exercise and commercial activities are not critical causes for disease transmission in London. Aware of the data limitations, we also discuss the representativeness of Twitter mobility by comparing our proposed measures to more established mobility indices. Overall, we conclude that mobility patterns obtained from geo-tweets are valuable for continuously monitoring urban changes at a fine spatiotemporal scale.

How Does Living in Temporary Accommodation and the COVID-19 Pandemic Impact under 5s' Healthcare Access and Health Outcomes? A Qualitative Study of Key Professionals in a Socially and Ethnically Diverse and Deprived Area of London.

Background: Children < 5 years living in temporary accommodation (U5TA) are vulnerable to poor health outcomes. Few qualitative studies have examined service provider perspectives in family homelessness; none have focused on U5TA with a cross-sector approach. This study explored professionals' perspectives of the barriers and facilitators, including pandemic-related challenges, experienced by U5TA in accessing healthcare and optimising health outcomes, and their experiences in delivering services. Methods: Sixteen semi-structured online interviews were conducted. Professionals working in Newham (London) with U5TA families were recruited from non-profit organisations, the health sector, and Local Authority. A thematic analysis was conducted. Findings: Professionals described barriers including poor parental mental health; unsuitable housing; no social support; mistrust of services; immigration administration; and financial insecurity. Digital poverty, language discordance, and the inability to register and track U5TA made them even less visible to services. Professionals tried to mitigate barriers with improved communication, and through community facilitators. Adverse pandemic effects on U5TA health included delay and regression in developmental milestones and behaviours. In-person services were reduced, exacerbating pre-existing barriers. Interpretation: COVID-19 further reduced the ability of professionals to deliver care to U5TA and significantly impacted the lives of U5TA with potential life-long risks. Innovative and tailored cross-sector strategies are needed, including co-production of public health services and policies focusing on early development, mental health support, employment training, and opportunities for parents/carers.

Sensing dynamic human activity zones using geo-tagged big data in Greater London, UK during the COVID-19 pandemic.

Exploration of dynamic human activity gives significant insights into understanding the urban environment and can help to reinforce scientific urban management strategies. Lots of studies are arising regarding the significant human activity changes in global metropolises and regions affected by COVID-19 containment policies. However, the variations of human activity dynamics amid different phases divided by the non-pharmaceutical intervention policies (e.g., stay-at-home, lockdown) have not been investigated across urban areas in space and time and discussed with the urban characteristic determinants. In this study, we aim to explore the influence of different restriction phases on dynamic human activity through sensing human activity zones (HAZs) and their dominated urban characteristics. Herein, we proposed an explainable analysis framework to explore the HAZ variations consisting of three parts, i.e., footfall detection, HAZs delineation and the identification of relationships between urban characteristics and HAZs. In our study area of Greater London, United Kingdom, we first utilised the footfall detection method to extract human activity metrics (footfalls) counted by visits/stays at space and time from the anonymous mobile phone GPS trajectories. Then, we characterised HAZs based on the homogeneity of daily human footfalls at census output areas (OAs) during the predefined restriction phases in the UK. Lastly, we examined the feature importance of explanatory variables as the metric of the relationship between human activity and urban characteristics using machine learning classifiers. The results show that dynamic human activity exhibits statistically significant differences in terms of the HAZ distributions across restriction phases and is strongly associated with urban characteristics (e.g., specific land use types) during the COVID-19 pandemic. These findings can improve the understanding of the variation of human activity patterns during the pandemic and offer insights into city management resource allocation in urban areas concerning dynamic human activity.

Ethnic inequalities in the impact of COVID-19 on primary care consultations: a time series analysis of 460,084 individuals with multimorbidity in South London.

BACKGROUND: The COVID-19 pandemic caused rapid changes in primary care delivery in the UK, with concerns that certain groups of the population may have faced increased barriers to access. This study assesses the impact of the response to the COVID-19 pandemic on primary care consultations for individuals with multimorbidity and identifies ethnic inequalities. METHODS: A longitudinal study based on monthly data from primary care health records of 460,084 patients aged ≥18 years from 41 GP practices in South London, from February 2018 to March 2021. Descriptive analysis and interrupted time series (ITS) models were used to analyse the effect of the pandemic on primary care consultations for people with multimorbidity and to identify if the effect varied by ethnic groups and consultation type. RESULTS: Individuals with multimorbidity experienced a smaller initial fall in trend at the start of the pandemic. Their primary care consultation rates remained stable (879 (95% CI 869-890) per 1000 patients in February to 882 (870-894) March 2020), compared with a 7% decline among people without multimorbidity (223 consultations (95% CI 221-226) to 208 (205-210)). The gap in consultations between the two groups reduced after July 2020. The effect among individuals with multimorbidity varied by ethnic group. Ethnic minority groups experienced a slightly larger fall at the start of the pandemic. Individuals of Black, Asian, and Other ethnic backgrounds also switched from face-to-face to telephone at a higher rate than other ethnic groups. The largest fall in face-to-face consultations was observed among people from Asian backgrounds (their consultation rates declined from 676 (659-693) in February to 348 (338-359) in April 2020), which may have disproportionately affected their quality of care. CONCLUSIONS: The COVID-19 pandemic significantly affected primary care utilisation in patients with multimorbidity. While there is evidence of a successful needs-based prioritisation of multimorbidity patients within primary care at the start of the pandemic, inequalities among ethnic minority groups were found. Strengthening disease management for these groups may be necessary to control widening inequalities in future health outcomes.

Training during the COVID-19 pandemic: the experience of public health registrars in the London and Kent, Surrey, Sussex training programme.

BACKGROUND: Public Health registrars (SpRs) were an important component of the workforce that contributed to the COVID-19 response. This study explores their contribution and the impact the early stages of the pandemic had on their learning and training. METHODS: Data were collected from SpRs in the London and Kent, Surrey, Sussex training programme between July and September 2020 through a mixture of questionnaires and semi-structured interviews. A thematic analysis of interview transcripts was undertaken to identify themes. RESULTS: 35/128 SpRs responded to the survey and 11 were interviewed. SpRs were placed across a range of organizations and made a significant contribution to the COVID-19 response. Overall, SpRs learned important skills but working on the response may for some have impacted negatively on training. A number of facilitators and barriers to learning were identified. CONCLUSION: The study findings highlight the opportunities for learning created by the pandemic. However, changing projects and the desire of SpRs to contribute to the response meant the impacts on training were mixed. Future deployment of SpRs should consider the balance of responsibility and pace when delegating work, as well as the need to supervise effectively and support remote working to maintain good mental wellbeing.

Impact of the COVID-19 pandemic on timeliness and equity of measles, mumps and rubella vaccinations in North East London: a longitudinal study using electronic health records.

OBJECTIVES: To quantify the effect of the COVID-19 pandemic on the timeliness of, and geographical and sociodemographic inequalities in, receipt of first measles, mumps and rubella (MMR) vaccination. DESIGN: Longitudinal study using primary care electronic health records. SETTING: 285 general practices in North East London. PARTICIPANTS: Children born between 23 August 2017 and 22 September 2018 (pre-pandemic cohort) or between 23 March 2019 and 1 May 2020 (pandemic cohort). MAIN OUTCOME MEASURE: Receipt of timely MMR vaccination between 12 and 18 months of age. METHODS: We used logistic regression to estimate the ORs (95% CIs) of receipt of a timely vaccination adjusting for sex, deprivation, ethnic background and Clinical Commissioning Group. We plotted choropleth maps of the proportion receiving timely vaccinations. RESULTS: Timely MMR receipt fell by 4.0% (95% CI: 3.4% to 4.6%) from 79.2% (78.8% to 79.6%) to 75.2% (74.7% to 75.7%) in the pre-pandemic (n=33 226; 51.3% boys) and pandemic (n=32 446; 51.4%) cohorts, respectively. After adjustment, timely vaccination was less likely in the pandemic cohort (0.79; 0.76 to 0.82), children from black (0.70; 0.65 to 0.76), mixed/other (0.77; 0.72 to 0.82) or with missing (0.77; 0.74 to 0.81) ethnic background, and more likely in girls (1.07; 1.03 to 1.11) and those from South Asian backgrounds (1.39; 1.30 to 1.48). Children living in the least deprived areas were more likely to receive a timely MMR (2.09; 1.78 to 2.46) but there was no interaction between cohorts and deprivation (Wald statistic: 3.44; p=0.49). The proportion of neighbourhoods where less than 60% of children received timely vaccination increased from 7.5% to 12.7% during the pandemic. CONCLUSIONS: The COVID-19 pandemic was associated with a significant fall in timely MMR receipt and increased geographical clustering of measles susceptibility in an area of historically low and inequitable MMR coverage. Immediate action is needed to avert measles outbreaks and support primary care to deliver timely and equitable vaccinations.

Experience of homelessness during the COVID-19 pandemic in Tower Hamlets, London: a health needs assessment.

BACKGROUND: The COVID-19 pandemic has affected people experiencing homelessness in multiple ways. The Everyone In initiative during 2020 was initially transformative in providing short-term accommodation for this group but was accompanied by major disruptions to treatment and support services. Understanding how these changes have affected health needs of people experiencing homelessness in the inner-city London Borough of Tower Hamlets can inform future service commissioning. METHODS: We conducted a focussed health needs assessment of people experiencing homelessness in Tower Hamlets. Quantitative data were gathered from the Combined Homelessness and Information Network (CHAIN), local authority housing services, primary care datasets, and substance dependency services. These data were combined with qualitative data from stakeholder meetings, facility visits, and lived experience insight from service users through interviews and focus groups. Analysis was targeted towards identifying gaps in existing commissioning. FINDINGS: We gathered data from 80 service users experiencing homelessness in Tower Hamlets between Sept 1 to Dec 31, 2021. Participants reported the largest impact of the pandemic being on their mental health. For people registered with specific homeless primary care services, 26·3% were experiencing depression and 12·8% other severe mental health issues. Service users with lived experience of homelessness described feeling let down by mental health support systems, describing that, despite positive experiences of individual staff, they felt the system as a whole was not well integrated. Specific issues were identified in hostel-based accommodation, where poor psychological and physical safety during lockdowns contributed to declines in mental health. INTERPRETATION: Using a health needs assessment, a necessity was identified to support the mental health of people experiencing homelessness in Tower Hamlets emerging from pandemic restrictions. People with lived experience of homelessness attributed deteriorations in mental health to extended time in inadequate accommodation, and reported that environments that take account of emotional and psychological needs were required. Provision of psychologically-informed accommodation environments and improved support service integration must be priorities for future local authority commissioning. FUNDING: None.

The effect of indoor soundscape on sexual wellbeing during the COVID-19 lockdown in London: a thematic analysis of remote workers' experiences.

BACKGROUND: Despite sexual wellbeing representing a potential component of the overall wellbeing of individuals, its relationship to indoor soundscape has not been investigated. The aim of this study was to identify acoustic-related variables linked to sexual wellbeing during the COVID-19 lockdown; the mechanisms through which those variables exert an influence; and the components of an ideal indoor soundscape for sexual wellbeing. METHODS: We did a thematic analysis of answers to an online survey conducted on Jan 18-19, 2021, via the Prolific participant platform. The survey was completed by 464 adult individuals working at home in London during the third national COVID-19 lockdown (Jan 6 to March 8, 2021). This study focused on two optional open-ended questions concerning (1) effects of the acoustic environment on sexual activity and (2) characteristics of an ideal soundscape for best experiencing sexual intercourse. The formation of codes and themes followed a combination of inductive and deductive approaches. FINDINGS: 345 responses were collected for question 1 (134 [39%] men, 210 [61%] women, one [<1%] other) and 310 responses for question 2 (124 [40%] men, 185 [60%] women, one [<1%] other), with a respondent age range of 18-65 years. The thematic analysis produced four themes: contextual features, characteristics of the acoustic environment, soundscape interpretation, and coping strategies. With regard to the acoustic environment, the main variables were related to the type of sound, sound dominance, and temporal patterns. Among the participants who provided relevant answers (n=239), 132 (55%) considered the acoustic environment irrelevant while being focused on the sexual activity, 72 (30%) reported negative or mixed effects, and 35 (15%) described only positive effects. Indoor soundscape resulted in privacy concerns, distraction, disruption, or support to sexual wellbeing. Soundscape interpretation triggered coping strategies (eg, adjusting windows or playing music) and behavioural changes (eg, lowering voice level), which in turn limited or increased sexual freedom, and affected or promoted sexual wellbeing. The ideal soundscape was described by three themes related to the availability of privacy and control, quietness, and pleasant sounds. INTERPRETATION: Although this study is qualitative in nature and no causal link can be established, it highlights the influence the acoustic environment at home had on sexual wellbeing during lockdown. FUNDING: Chartered Institution of Building Services Engineers.

How did living in temporary accommodation during the COVID-19 pandemic affect children younger than 5 years' access to health care and health outcomes? A qualitative study of key professionals in a socially and ethnically diverse and deprived area of London.

BACKGROUND: Children younger than 5 years living in temporary accommodation due to homelessness (U5TA) are extremely vulnerable to the effects of the COVID-19 pandemic. Few qualitative studies have examined provider perspectives in family homelessness, but none focused on U5TA specifically. We aimed to qualitatively explore professionals' perspectives of pandemic-related challenges and barriers experienced by U5TA in accessing health care and optimising health outcomes, and their experiences of delivering U5TA services. METHODS: 16 semi-structured interviews were done online. Professionals working in the London Borough of Newham with U5TA families were purposively sampled and recruited from non-profit organisations, the health sector, and local authority. A thematic codebook approach was used to analyse the data combining inductive and deductive codes using an adapted socioecological model as a guiding theoretical framework. FINDINGS: Two non-profit organisation professionals, seven health visitors, one GP, therapist, dietician, nurse, public health consultant, and two social workers from the local authority's No Recourse to Public Funds team described adverse pandemic effects on U5TA health: delay and regression in developmental milestones and behaviours-eg, toileting, feeding skills, emotional regulation, and social-communication skills. Pre-existing systemic barriers were exacerbated during the pandemic when the reduction of in-person services with professionals necessitated remote delivery of health and social care services. Differential effects of digital poverty, language discordance, and inability to register and track U5TA rendered this population invisible to services. Professionals highly agreed that barriers to optimal health outcomes and service access included poor mental health, unsuitable housing, no social support, mistrust of mainstream services, immigration administration, financial insecurity, and loss of informal jobs among U5TA families. Professionals sometimes mitigated these barriers with good communication skills, developing trusting relations, and through community facilitators. INTERPRETATION: COVID-19 widened health inequalities and inequities, substantially affecting the lives of U5TA and ability of professionals to deliver quality care to U5TA. Innovative and tailored cross-sector strategies, including co-production of public health services, are required. Policies and services urgently need to focus on early development, mental health support, employment training, and opportunities for parents and carers, plus unambiguous definitions of what is deemed suitable accommodation and actionable planned steps to ensure enforcement. FUNDING: None.

Implementing behavioural science informed letter interventions to increase COVID-19 vaccination uptake in uncontactable London residents: a difference-in-difference study in London, UK.

BACKGROUND: The UK COVID-19 vaccination programme began in December, 2020. By February, 2021, eight North West London Clinical Commissioning Groups (CCGs) had the lowest vaccination rates nationally. This study evaluated the impact of behavioural science-informed (BI) letters on vaccination uptake. METHODS: Unvaccinated residents of the Central London CCG who were deemed uncontactable (through text messaging and phone calls) were identified with the whole systems integrated care database. BI letters were sent to residents in the intervention CCG between May and June, 2021. Three neighbouring CCGs in London with similar non-responder data were used as control groups. A linear difference-in-difference analysis was undertaken to assess change in vaccine uptake rate across all four CCGs. Percentage point change was adjusted for selected covariates including ethnicity, age, gender, and index of multiple deprivation (IMD) quintiles. Approval was obtained from the quality improvement and audit office of Imperial College Healthcare NHS Trust (London, UK). FINDINGS: Within the intervention Central London CCG, 10 161 residents received the BI letter. The control CCGs contained 27 383 uncontactable residents. All CCGs showed an increase in vaccination rates in this population. The linear difference-in-difference analysis showed an increase in vaccination uptake in the intervention CCG (relative change 31·9% (95% CI 30·5-33·3; p<0·0001). Residents in IMD quintile 5 (least deprived) showed the largest rate of change (4·1%; p<0·0001). Residents with a mixed or multiple ethnic background were less likely to receive a COVID-19 vaccine (-4·1%, p<0·0001). INTERPRETATION: BI letters improved the rate of vaccine uptake. The percentage point increase of 31·9% equates to 436 additional previously uncontactable residents being vaccinated. Our data highlighted differences in the effect of BI-informed interventions in population subgroups. BI letters are a cost-effective and trusted communication tool, effectively engaging residents where other communication strategies did not work. FUNDING: None.

The impact of the COVID-19 pandemic on people experiencing homelessness: a qualitative interview study in the UK.

BACKGROUND: People experiencing homelessness faced unique challenges during the COVID-19 pandemic, including changes to accommodation availability, societal restrictions impacting access to essentials like food, and services moving to remote access. There is a paucity of in-depth qualitative research exploring how the pandemic affected this population, which this research aims to address. METHODS: 33 semi-structured qualitative interviews (22 with people who experienced homelessness during the pandemic and 11 with homelessness sector service providers) were done in the UK between April 26, 2021, and Jan, 25, 2022. Ethical approval was granted by the University College London research ethics committee (Project ID: 14895/005) and all participants provided informed consent. Interviews were audio-recorded, transcribed, and analysed using reflexive thematic analysis utilising NVivo software. Four interviews were coded by two researchers for consistency of codes. FINDINGS: In our sample of people experiencing homelessness, 11 (50%) were female, 13 (59%) White British, all were aged between 24 and 59 years, and all had lived in hostels or hotels, with friends or family, or on the streets during the pandemic. Providers interviewed worked for varied services, including support charities, housing, and addiction services. Four key themes were identified: understanding of and adherence to COVID guidelines; changes to accommodation and experiences of "Everyone In" (a government initiative in which people sleeping on the street or in accommodation where it was difficult to self-isolate were provided emergency accommodation); living through a pandemic while navigating homelessness; and, adaptations to service provision for people experiencing homelessness. INTERPRETATION: Policy makers and public health communicators must learn from people experiencing homelessness to maximise effectiveness of future public health strategies. Housing providers and support services should recognise the implications of imposing a scarcity of choice on people who need accommodation during a public health emergency. The loss of usual support was destabilising for people experiencing homelessness, triggering a need to adopt survival tactics which negatively influence their health. Although this research was limited by the possibility that views expressed might differ from those unwilling or unable to participate, it does highlight successes and difficulties in supporting people experiencing homelessness during the COVID-19 pandemic and informs planning for similar public health events. FUNDING: Nuffield Foundation, Wellcome Trust.

"We've all got the virus inside us now": Disaggregating public health relations and responsibilities for health protection in pandemic London.

The COVID-19 pandemic has disproportionately impacted ethnic minorities in the global north, evidenced by higher rates of transmission, morbidity, and mortality relative to population sizes. Orthodox Jewish neighbourhoods in London had extremely high SARS-CoV-2 seroprevalence rates, reflecting patterns in Israel and the US. The aim of this paper is to examine how responsibilities over health protection are conveyed, and to what extent responsibility is sought by, and shared between, state services, and 'community' stakeholders or representative groups, and families in public health emergencies. The study investigates how public health and statutory services stakeholders, Orthodox Jewish communal custodians and households sought to enact health protection in London during the first year of the pandemic (March 2020-March 2021). Twenty-eight semi-structured interviews were conducted across these cohorts. Findings demonstrate that institutional relations - both their formation and at times fragmentation - were directly shaped by issues surrounding COVID-19 control measures. Exchanges around protective interventions (whether control measures, contact tracing technologies, or vaccines) reveal diverse and diverging attributions of responsibility and authority. The paper develops a framework of public health relations to understand negotiations between statutory services and minority groups over responsiveness and accountability in health protection. Disaggregating public health relations can help social scientists to critique who and what characterises institutional relationships with minority groups, and what ideas of responsibility and responsiveness are projected by differently-positioned stakeholders in health protection.

Troponin and short-term mortality in hospitalised patients with COVID-19 infection: a retrospective study in an inner-city London hospital.

OBJECTIVE: To investigate the association between troponin positivity in patients hospitalised with COVID-19 and increased mortality in the short term. SETTING: Homerton University Hospital, an inner-city district general hospital in East London. DESIGN: A single-centre retrospective observational study. PARTICIPANTS: All adults admitted with swab-proven RT-PCR COVID-19 to Homerton University Hospital from 4 February 2020 to 30 April 2020 (n=402). OUTCOME MEASURES: We analysed demographic and biochemical data collected from the patient record according to the primary outcome of death at 28 days during hospital admission. METHODS: Troponin positivity was defined above the upper limit of normal according to our local laboratory assay (>15.5 ng/L for females, >34 ng/L for males). Univariate and multivariate logistical regression analyses were performed to evaluate the link between troponin positivity and death. RESULTS: Mean age was 65.3 years for men compared with 63.8 years for women. A χ2 test showed survival of patients with COVID-19 was significantly higher in those with a negative troponin (p=3.23×10-10) compared with those with a positive troponin. In the multivariate logistical regression, lung disease, age, troponin positivity and continuous positive airway pressure were all significantly associated with death, with an area under the curve of 0.889, sensitivity of 0.886 and specificity of 0.629 for the model. Within this model, troponin positivity was independently associated with short-term mortality (OR 2.97, 95% CI 1.34 to 6.61, p=0.008). CONCLUSIONS: We demonstrated an independent association between troponin positivity and increased short-term mortality in COVID-19 in a London district general hospital.

Transmission of SARS-CoV-2 by children to contacts in schools and households: a prospective cohort and environmental sampling study in London.

BACKGROUND: Assessing transmission of SARS-CoV-2 by children in schools is of crucial importance to inform public health action. We assessed frequency of acquisition of SARS-CoV-2 by contacts of pupils with COVID-19 in schools and households, and quantified SARS-CoV-2 shedding into air and onto fomites in both settings. METHODS: We did a prospective cohort and environmental sampling study in London, UK in eight schools. Schools reporting new cases of SARS-CoV-2 infection to local health protection teams were invited to take part if a child index case had been attending school in the 48 h before a positive SARS-CoV-2 PCR test. At the time of the study, PCR testing was available to symptomatic individuals only. Children aged 2-14 years (extended to <18 years in November, 2020) with a new nose or throat swab SARS-CoV-2 positive PCR from an accredited laboratory were included. Incidents involving exposure to at least one index pupil with COVID-19 were identified (the prevailing variants were original, α, and δ). Weekly PCR testing for SARS-CoV-2 was done on immediate classroom contacts (the so-called bubble), non-bubble school contacts, and household contacts of index pupils. Testing was supported by genome sequencing and on-surface and air samples from school and home environments. FINDINGS: Between October, 2020, and July, 2021 from the eight schools included, secondary transmission of SARS-CoV-2 was not detected in 28 bubble contacts, representing ten bubble classes (participation rate 8·8% [IQR 4·6-15·3]). Across eight non-bubble classes, 3 (2%) of 62 pupils tested positive, but these were unrelated to the original index case (participation rate 22·5% [9·7-32·3]). All three were asymptomatic and tested positive in one setting on the same day. In contrast, secondary transmission to previously negative household contacts from infected index pupils was found in six (17%) of 35 household contacts rising to 13 (28%) of 47 household contacts when considering all potential infections in household contacts. Environmental contamination with SARS-CoV-2 was rare in schools: fomite SARS-CoV-2 was identified in four (2%) of 189 samples in bubble classrooms, two (2%) of 127 samples in non-bubble classrooms, and five (4%) of 130 samples in washrooms. This contrasted with fomites in households, where SARS-CoV-2 was identified in 60 (24%) of 248 bedroom samples, 66 (27%) of 241 communal room samples, and 21 (11%) 188 bathroom samples. Air sampling identified SARS-CoV-2 RNA in just one (2%) of 68 of school air samples, compared with 21 (25%) of 85 air samples taken in homes. INTERPRETATION: There was no evidence of large-scale SARS-CoV-2 transmission in schools with precautions in place. Low levels of environmental contamination in schools are consistent with low transmission frequency and suggest adequate cleaning and ventilation in schools during the period of study. The high frequency of secondary transmission in households associated with evident viral shedding throughout the home suggests a need to improve advice to households with infection in children to prevent onward community spread. The data suggest that SARS-CoV-2 transmission from children in any setting is very likely to occur when precautions are reduced. FUNDING: UK Research and Innovation and UK Department of Health and Social Care, National Institute for Health and Care Research.

Uncovering SARS-COV-2 vaccine uptake and COVID-19 impacts among First Nations, Inuit and Métis Peoples living in Toronto and London, Ontario.

BACKGROUND: First Nations, Inuit and Métis Peoples across geographies are at higher risk of SARS-CoV-2 infection and COVID-19 because of high rates of chronic disease, inadequate housing and barriers to accessing health services. Most Indigenous Peoples in Canada live in cities, where SARS-CoV-2 infection is concentrated. To address gaps in SARS-CoV-2 information for these urban populations, we partnered with Indigenous agencies and sought to generate rates of SARS-CoV-2 testing and vaccination, and incidence of infection for First Nations, Inuit and Métis living in 2 Ontario cities. METHODS: We drew on existing cohorts of First Nations, Inuit and Métis adults in Toronto (n = 723) and London (n = 364), Ontario, who were recruited using respondent-driven sampling. We linked to ICES SARS-CoV-2 databases and prospectively monitored rates of SARS-CoV-2 testing, diagnosis and vaccination for First Nations, Inuit and Métis, and comparator city and Ontario populations. RESULTS: We found that SARS-CoV-2 testing rates among First Nations, Inuit and Métis were higher in Toronto (54.7%, 95% confidence interval [CI] 48.1% to 61.3%) and similar in London (44.5%, 95% CI 36.0% to 53.1%) compared with local and provincial rates. We determined that cumulative incidence of SARS-CoV-2 infection was not significantly different among First Nations, Inuit and Métis in Toronto (7364/100 000, 95% CI 2882 to 11 847) or London (7707/100 000, 95% CI 2215 to 13 200) compared with city rates. We found that rates of vaccination among First Nations, Inuit and Métis in Toronto (58.2%, 95% CI 51.4% to 64.9%) and London (61.5%, 95% CI 52.9% to 70.0%) were lower than the rates for the 2 cities and Ontario. INTERPRETATION: Although Ontario government policies prioritized Indigenous populations for SARS-CoV-2 vaccination, vaccine uptake was lower than in the general population for First Nations, Inuit and Métis Peoples in Toronto and London. Ongoing access to culturally safe testing and vaccinations is urgently required to avoid disproportionate hospital admisson and mortality related to COVID-19 in these communities.