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1.
Multimedia | Multimedia Resources, MULTIMEDIA-SMS-SP | ID: multimedia-13488

ABSTRACT


Subject(s)
COVID-19 , Vaccines
2.
Multimedia | Multimedia Resources, MULTIMEDIA-SMS-SP | ID: multimedia-13489

ABSTRACT


Subject(s)
COVID-19 , Vaccines
3.
Multimedia | Multimedia Resources, MULTIMEDIA-SMS-SP | ID: multimedia-13409

ABSTRACT

Boletim informativo sobre a situação do novo coronavírus na capital paulista nos hospitais da rede municipal e de campanha, contratualizados e Atenção Básica.


Subject(s)
COVID-19
4.
Multimedia | Multimedia Resources, MULTIMEDIA-SMS-SP | ID: multimedia-13410

ABSTRACT

Boletim informativo sobre a situação do novo coronavírus na capital paulista nos hospitais da rede municipal e de campanha, contratualizados e Atenção Básica.


Subject(s)
COVID-19
5.
Multimedia | Multimedia Resources, MULTIMEDIA-SMS-SP | ID: multimedia-13411

ABSTRACT

Boletim informativo sobre a situação do novo coronavírus na capital paulista nos hospitais da rede municipal e de campanha, contratualizados e Atenção Básica.


Subject(s)
COVID-19
6.
Multimedia | Multimedia Resources, MULTIMEDIA-SMS-SP | ID: multimedia-13413

ABSTRACT

Boletim informativo sobre a situação do novo coronavírus na capital paulista nos hospitais da rede municipal e de campanha, contratualizados e Atenção Básica.


Subject(s)
COVID-19
7.
Multimedia | Multimedia Resources, MULTIMEDIA-SMS-SP | ID: multimedia-13414

ABSTRACT

Boletim informativo sobre a situação do novo coronavírus na capital paulista nos hospitais da rede municipal e de campanha, contratualizados e Atenção Básica.


Subject(s)
COVID-19
8.
Multimedia | Multimedia Resources, MULTIMEDIA-SMS-SP | ID: multimedia-13415

ABSTRACT

Boletim informativo sobre a situação do novo coronavírus na capital paulista nos hospitais da rede municipal e de campanha, contratualizados e Atenção Básica.


Subject(s)
COVID-19
9.
Glob Health Action ; 17(1): 2371184, 2024 Dec 31.
Article in English | MEDLINE | ID: mdl-38949664

ABSTRACT

BACKGROUND: The COVID-19 pandemic prompted varied policy responses globally, with Latin America facing unique challenges. A detailed examination of these policies' impacts on health systems is crucial, particularly in Bolivia, where information about policy implementation and outcomes is limited. OBJECTIVE: To describe the COVID-19 testing trends and evaluate the effects of quarantine measures on these trends in Cochabamba, Bolivia. METHODS: Utilizing COVID-19 testing data from the Cochabamba Department Health Service for the 2020-2022 period. Stratified testing rates in the health system sectors were first estimated followed by an interrupted time series analysis using a quasi-Poisson regression model for assessing the quarantine effects on the mitigation of cases during surge periods. RESULTS: The public sector reported the larger percentage of tests (65%), followed by the private sector (23%) with almost double as many tests as the public-social security sector (11%). In the time series analysis, a correlation between the implementation of quarantine policies and a decrease in the slope of positive rates of COVID-19 cases was observed compared to periods without or with reduced quarantine policies. CONCLUSION: This research underscores the local health system disparities and the effectiveness of stringent quarantine measures in curbing COVID-19 transmission in the Cochabamba region. The findings stress the importance of the measures' intensity and duration, providing valuable lessons for Bolivia and beyond. As the global community learns from the pandemic, these insights are critical for shaping resilient and effective health policy responses.


Main findings: The findings highlight the importance of stringent quarantine measures in managing infectious disease outbreaks, offering valuable insights for policymakers worldwide in strategizing effective public health interventions.Added knowledge: By providing a detailed analysis of testing disparities and quarantine policies' effectiveness within a specific Latin American context, our research fills a critical gap in understanding their impacts on health system responses and disease control.Global health impact for policy and action: The findings highlight the importance of stringent quarantine measures in managing infectious disease outbreaks, offering valuable insights for policymakers worldwide in strategizing effective public health interventions.


Subject(s)
COVID-19 , Interrupted Time Series Analysis , Quarantine , SARS-CoV-2 , Humans , COVID-19/prevention & control , COVID-19/epidemiology , Bolivia/epidemiology , Health Policy , COVID-19 Testing/statistics & numerical data , Pandemics/prevention & control
10.
JAMA Netw Open ; 7(7): e2419258, 2024 Jul 01.
Article in English | MEDLINE | ID: mdl-38949812

ABSTRACT

Importance: In the context of emerging SARS-CoV-2 variants or lineages and new vaccines, it is key to accurately monitor COVID-19 vaccine effectiveness (CVE) to inform vaccination campaigns. Objective: To estimate the effectiveness of COVID-19 vaccines administered in autumn and winter 2022 to 2023 against symptomatic SARS-CoV-2 infection (with all circulating viruses and XBB lineage in particular) among people aged 60 years or older in Europe, and to compare different CVE approaches across the exposed and reference groups used. Design, Setting, and Participants: This case-control study obtained data from VEBIS (Vaccine Effectiveness, Burden and Impact Studies), a multicenter study that collects COVID-19 and influenza data from 11 European sites: Croatia; France; Germany; Hungary; Ireland; Portugal; the Netherlands; Romania; Spain, national; Spain, Navarre region; and Sweden. Participants were primary care patients aged 60 years or older with acute respiratory infection symptoms who were recruited at the 11 sites after the start of the COVID-19 vaccination campaign from September 2022 to August 2023. Cases and controls were defined as patients with positive and negative, respectively, reverse transcription-polymerase chain reaction (RT-PCR) test results. Exposures: The exposure was COVID-19 vaccination. The exposure group consisted of patients who received a COVID-19 vaccine during the autumn and winter 2022 to 2023 vaccination campaign and 14 days or more before symptom onset. Reference group included patients who were not vaccinated during or in the 6 months before the 2022 to 2023 campaign (seasonal CVE), those who were never vaccinated (absolute CVE), and those who were vaccinated with at least the primary series 6 months or more before the campaign (relative CVE). For relative CVE of second boosters, patients receiving their second booster during the campaign were compared with those receiving 1 booster 6 months or more before the campaign. Main Outcomes and Measures: The outcome was RT-PCR-confirmed, medically attended, symptomatic SARS-CoV-2 infection. Four CVE estimates were generated: seasonal, absolute, relative, and relative of second boosters. CVE was estimated using logistic regression, adjusting for study site, symptom onset date, age, chronic condition, and sex. Results: A total of 9308 primary care patients were included, with 1687 cases (1035 females; median [IQR] age, 71 [65-79] years) and 7621 controls (4619 females [61%]; median [IQR] age, 71 [65-78] years). Within 14 to 89 days after vaccination, seasonal CVE was 29% (95% CI, 14%-42%), absolute CVE was 39% (95% CI, 6%-60%), relative CVE was 31% (95% CI, 15% to 44%), and relative CVE of second boosters was 34% (95% CI, 18%-47%) against all SARS-CoV-2 variants. In the same interval, seasonal CVE was 44% (95% CI, -10% to 75%), absolute CVE was 52% (95% CI, -23% to 82%), relative CVE was 47% (95% CI, -8% to 77%), and relative CVE of second boosters was 46% (95% CI, -13% to 77%) during a period of high XBB circulation. Estimates decreased with time since vaccination, with no protection from 180 days after vaccination. Conclusions and Relevance: In this case-control study among older Europeans, all CVE approaches suggested that COVID-19 vaccines administered in autumn and winter 2022 to 2023 offered at least 3 months of protection against symptomatic, medically attended, laboratory-confirmed SARS-CoV-2 infection. The effectiveness of new COVID-19 vaccines against emerging SARS-CoV-2 variants should be continually monitored using CVE seasonal approaches.


Subject(s)
COVID-19 Vaccines , COVID-19 , SARS-CoV-2 , Seasons , Vaccine Efficacy , Humans , Aged , COVID-19/prevention & control , COVID-19/epidemiology , COVID-19 Vaccines/administration & dosage , COVID-19 Vaccines/therapeutic use , Female , Europe/epidemiology , Male , SARS-CoV-2/immunology , Middle Aged , Case-Control Studies , Aged, 80 and over , Vaccination/statistics & numerical data , European People
11.
BMJ Open ; 14(6): e083224, 2024 Jul 01.
Article in English | MEDLINE | ID: mdl-38951002

ABSTRACT

OBJECTIVES: To determine acceptability and feasibility of a theatre-based wellness programme to support the health and well-being of people with long COVID. DESIGN: Single-group, repeated-measures feasibility study. SETTING: Community centre and online. PARTICIPANTS: Adults with diagnosed long COVID experiencing breathlessness, pain and/or loneliness. INTERVENTION: Six-week participatory creative programme delivered to one online and one in-person group facilitated by movement, voice and drama consultants using breathing, visualisation, singing, poetry, storytelling and movement exercises. PRIMARY OUTCOME MEASURES: Programme acceptability and feasibility measured via uptake, reasons for non-attendance and barriers to engagement. SECONDARY OUTCOME MEASURES: Feasibility of recruitment and data collection procedures measured through proportion of missing data and follow-up rates, mechanisms of action of the programme identified through qualitative interviews, changes in mental health, well-being, quality of life, loneliness, social support, fatigue, breathlessness and post-COVID-19 functional status at 8-week follow-up. RESULTS: 21 people expressed interest in participating, 20 people took part in the programme, 19 completed baseline and 16 completed follow-up assessments. Participants attended an average of 4.8 of 6 sessions (SD=1.5, range 2-6). Exploratory analyses demonstrated significant improvements in self-rated health (t-test mean difference=0.12, 95% CI=0.00, 0.23, p=0.04) and chronic fatigue symptoms (mean difference=-3.50, 95% CI=-6.97, -0.03, p=0.05) at 8 weeks. Key mechanisms of action that supported health and well-being included: increased sense of community, illness acceptance, experiencing joy, increased confidence in managing everyday life, increased ability to relax and reconnection with previous identity. Barriers to engagement included: activities being outside of the participant's comfort zone, ongoing long COVID symptoms, emotional consequences of sharing experiences and connectivity and connecting online. CONCLUSIONS: A 6-week theatre-based programme was perceived as acceptable to most participants and resulted in some positive psychosocial impacts. The findings provide a rationale for supporting the ongoing development and scale-up of this and related arts programmes to support people living with long COVID.


Subject(s)
COVID-19 , Feasibility Studies , Health Promotion , Quality of Life , SARS-CoV-2 , Humans , COVID-19/psychology , Male , Female , Middle Aged , Aged , Health Promotion/methods , Drama , Loneliness/psychology , Patient Acceptance of Health Care/psychology , Adult , Social Support
12.
Nat Commun ; 15(1): 5503, 2024 Jun 29.
Article in English | MEDLINE | ID: mdl-38951531

ABSTRACT

Proline is widely known as the only proteogenic amino acid with a secondary amine. In addition to its crucial role in protein structure, the secondary amino acid modulates neurotransmission and regulates the kinetics of signaling proteins. To understand the structural basis of proline import, we solved the structure of the proline transporter SIT1 in complex with the COVID-19 viral receptor ACE2 by cryo-electron microscopy. The structure of pipecolate-bound SIT1 reveals the specific sequence requirements for proline transport in the SLC6 family and how this protein excludes amino acids with extended side chains. By comparing apo and substrate-bound SIT1 states, we also identify the structural changes that link substrate release and opening of the cytoplasmic gate and provide an explanation for how a missense mutation in the transporter causes iminoglycinuria.


Subject(s)
Angiotensin-Converting Enzyme 2 , Cryoelectron Microscopy , Proline , SARS-CoV-2 , Angiotensin-Converting Enzyme 2/metabolism , Angiotensin-Converting Enzyme 2/chemistry , Angiotensin-Converting Enzyme 2/genetics , Proline/metabolism , Humans , SARS-CoV-2/metabolism , SARS-CoV-2/genetics , COVID-19/virology , COVID-19/metabolism , Amino Acid Transport Systems, Neutral/metabolism , Amino Acid Transport Systems, Neutral/genetics , Amino Acid Transport Systems, Neutral/chemistry , Models, Molecular
13.
Sci Rep ; 14(1): 15005, 2024 07 01.
Article in English | MEDLINE | ID: mdl-38951534

ABSTRACT

To assess malnutrition contribution to the functional status and health related quality of life after hospitalization due to COVID-19 pneumonia, 66 selected adults referred for physical rehabilitation accepted to participate in the study; none of them required oxygen supply or had history of lung/musculoskeletal/neurological/immune/rheumatic disease or trauma, or contraindication for respiratory-function tests. At three evaluations, with 3 months in-between, assessments included: self-report of functional status, the St. George's Respiratory Questionnaire, spirometry, the 6-min-walk-test, the MRC-scale, the 30-s sit-to-stand-test, the timed-up-and-go-test, nutritional status, and ultrasound imaging (vastus medialis and diaphragm). At referral, patients had nutritional deficits with protein deficiency, which gradually improved; while muscle thickness (of both vastus medialis and diaphragm) increased, along with muscle strength and mobility (ANOVA, p < 0.05). Contrarywise, the distance covered during the 6-min-walk-test decreased (ANOVA, p < 0.05), with a negative influence from excess body mass. During rehabilitation, health-related quality of life and functional status improved, with negative influence from a history of tobacco use and referral delay, respectively. After hospitalization due to COVID-19, early diagnosis of both protein deficiency and decrease of skeletal muscle thickness could be relevant for rehabilitation, while pondering the negative impact of excess body mass on submaximal exercise performance.


Subject(s)
COVID-19 , Functional Status , Malnutrition , Nutritional Status , Quality of Life , Humans , COVID-19/psychology , COVID-19/epidemiology , COVID-19/physiopathology , Male , Female , Middle Aged , Aged , Follow-Up Studies , SARS-CoV-2/isolation & purification , Adult , Hospitalization , Muscle Strength/physiology , Surveys and Questionnaires
14.
Sci Rep ; 14(1): 14982, 2024 07 01.
Article in English | MEDLINE | ID: mdl-38951554

ABSTRACT

Our objective was to study disparities in access to contraception during the COVID-19 pandemic. We performed a cross-sectional study at the University of Campinas, Brazil using a Google questionnaire applied from December 2021 until February 2022, disseminated via snowball technique. The survey asked about sociodemographic characteristics and contraceptive use, as well as the demand for new methods and difficulties in continuing to use contraceptives during the COVID-19 pandemic. We analyzed 1018 completed questionnaires; in total, 742 (72.9%) were women aged between 20 and 39 years, 746 (73.3%) were White and 602 (59.2%) used contraceptives. During the COVID-19 pandemic, about 23% of respondents changed their method and approximately 20% of respondents looked for new methods. Among the latter, 31.3% reported some difficulty with obtaining guidance on new methods while only 5.3% of the respondents reported some difficulty with continuing their contraceptive. The main difficulty in both cases was the difficulty with getting a healthcare provider appointment. Our results point to a particular epidemiological population, of younger black and biracial women, with lower education and lower income, which suffered health disparities during the COVID-19 pandemic and found difficulties with using contraceptives and accessing family planning services.


Subject(s)
COVID-19 , Contraception , Health Services Accessibility , SARS-CoV-2 , Humans , COVID-19/epidemiology , Brazil/epidemiology , Female , Adult , Cross-Sectional Studies , Young Adult , Contraception/statistics & numerical data , Health Services Accessibility/statistics & numerical data , SARS-CoV-2/isolation & purification , Surveys and Questionnaires , Contraception Behavior/statistics & numerical data , Pandemics , Healthcare Disparities/statistics & numerical data
15.
Sci Rep ; 14(1): 15048, 2024 07 01.
Article in English | MEDLINE | ID: mdl-38951614

ABSTRACT

The widespread adoption of smartphones coupled with advancements in artificial intelligence has significantly propelled the use of intelligent personal assistants (IPAs). These digital assistants have become indispensable for many users, particularly during the COVID-19 pandemic. Employing coviance-based structural equation modeling (CB-SEM) and analyzing data from 260 participants, this study explores the key factors influencing IPA usage intensity. Contrary to expectations, affective risk perception showed no significant impact on either IPA usage or parasocial interaction during the pandemic. In stark contrast, cabin fever syndrome significantly influenced both IPA usage and parasocial interaction, underscoring the role of environmental and psychological stressors in shaping technology use. Furthermore, loneliness was found to significantly enhance parasocial interaction with IPAs, though it did not affect usage intensity. The findings highlight a substantial connection between parasocial interaction and IPA usage intensity, suggesting that users who engage in human-like interactions with IPAs tend to use them more extensively. These insights not only deepen our understanding of how IPAs are utilized during health crises but also point to potential directions for developing IPAs that are more responsive to users' emotional and social needs.


Subject(s)
COVID-19 , Humans , COVID-19/epidemiology , COVID-19/psychology , Female , Male , Adult , SARS-CoV-2 , Smartphone , Pandemics , Computers, Handheld , Middle Aged , Loneliness/psychology , Young Adult
16.
BMC Health Serv Res ; 24(1): 772, 2024 Jul 01.
Article in English | MEDLINE | ID: mdl-38951799

ABSTRACT

BACKGROUND: Alcohol-related mortality and morbidity increased during the COVID-19 pandemic in England, with people from lower-socioeconomic groups disproportionately affected. The North East and North Cumbria (NENC) region has high levels of deprivation and the highest rates of alcohol-related harm in England. Consequently, there is an urgent need for the implementation of evidence-based preventative approaches such as identifying people at risk of alcohol harm and providing them with appropriate support. Non-alcohol specialist secondary care clinicians could play a key role in delivering these interventions, but current implementation remains limited. In this study we aimed to explore current practices and challenges around identifying, supporting, and signposting patients with Alcohol Use Disorder (AUD) in secondary care hospitals in the NENC through the accounts of staff in the post COVID-19 context. METHODS: Semi-structured qualitative interviews were conducted with 30 non-alcohol specialist staff (10 doctors, 20 nurses) in eight secondary care hospitals across the NENC between June and October 2021. Data were analysed inductively and deductively to identify key codes and themes, with Normalisation Process Theory (NPT) then used to structure the findings. RESULTS: Findings were grouped using the NPT domains 'implementation contexts' and 'implementation mechanisms'. The following implementation contexts were identified as key factors limiting the implementation of alcohol prevention work: poverty which has been exacerbated by COVID-19 and the prioritisation of acute presentations (negotiating capacity); structural stigma (strategic intentions); and relational stigma (reframing organisational logics). Implementation mechanisms identified as barriers were: workforce knowledge and skills (cognitive participation); the perception that other departments and roles were better placed to deliver this preventative work than their own (collective action); and the perceived futility and negative feedback cycle (reflexive monitoring). CONCLUSIONS: COVID-19, has generated additional challenges to identifying, supporting, and signposting patients with AUD in secondary care hospitals in the NENC. Our interpretation suggests that implementation contexts, in particular structural stigma and growing economic disparity, are the greatest barriers to implementation of evidence-based care in this area. Thus, while some implementation mechanisms can be addressed at a local policy and practice level via improved training and support, system-wide action is needed to enable sustained delivery of preventative alcohol work in these settings.


Subject(s)
Alcoholism , COVID-19 , Qualitative Research , Secondary Care , Humans , COVID-19/epidemiology , COVID-19/prevention & control , COVID-19/psychology , England/epidemiology , SARS-CoV-2 , Female , Male , Pandemics/prevention & control , Adult , Interviews as Topic
17.
BMC Public Health ; 24(1): 1751, 2024 Jul 01.
Article in English | MEDLINE | ID: mdl-38951819

ABSTRACT

BACKGROUND: At the time of the emergence of COVID-19, denialist and anti-vaccine groups have also emerged and are shaking public confidence in vaccination. METHODS: A qualitative study was conducted using online focus groups. Participants had not received any doses of vaccination against the disease. A total of five focus group sessions were conducted with 28 participants. They were recruited by snowball sampling and by convenience sampling. RESULTS: The two major topics mentioned by the participants were adverse effects and information. The adverse effects described were severe and included sudden death. In the case of information, participants reported: (1) consultation of websites on which scientists posted anti-vaccination content; and (2) distrust. CONCLUSIONS: At a time when anti-vaccine groups pose a major challenge to public health in general, and to COVID-19 vaccination campaigns in particular, this study is a first step towards gaining deeper insight into the factors that lead to COVID-19 vaccine refusal.


Subject(s)
COVID-19 Vaccines , COVID-19 , Focus Groups , Qualitative Research , Vaccination Hesitancy , Vaccination Refusal , Humans , Spain , COVID-19/prevention & control , COVID-19/psychology , Female , Male , Adult , COVID-19 Vaccines/administration & dosage , Vaccination Hesitancy/psychology , Vaccination Hesitancy/statistics & numerical data , Vaccination Refusal/psychology , Middle Aged , Anti-Vaccination Movement/psychology , Aged , Young Adult , SARS-CoV-2
18.
Int J Equity Health ; 23(1): 131, 2024 Jul 01.
Article in English | MEDLINE | ID: mdl-38951827

ABSTRACT

Health inequalities amplified by the COVID-19 pandemic have disproportionately affected racialized and equity-deserving communities across Canada. In the Municipality of Peel, existing data, while limited, illustrates that individuals from racialized and equity-deserving communities continue to suffer, receive delayed care, and die prematurely. In response to these troubling statistics, grassroots community advocacy has called on health systems leaders in Peel to work with community and non-profit organizations to address the critical data and infrastructure gaps that hinder addressing the social determinants of health in the region. To support these advocacy efforts, we used a community-based participatory research approach to understand how we might build a data collection ecosystem across sectors, alongside community residents and service providers, to accurately capture the data about the social determinants of health. This approach involved developing a community engagement council, defining the problem with the community, mapping what data is actively collected and what is excluded, and understanding experiences of sociodemographic data collection from community members and service providers. Guided by community voices, our study focused on sociodemographic data collection in the primary care context and identified which service providers use and collect these data, how data are used in their work, the facilitators and barriers to data use and collection. Additionally, we gained insight into how sociodemographic data collection could be respectful, safe, and properly governed from the perspectives of community members. From this study, we identify a set of eight recommendations for sociodemographic data collection and highlight limitations. This foundational community-based work will inform future research in establishing data governance in partnership with diverse and equity-deserving communities.


Subject(s)
COVID-19 , Community-Based Participatory Research , Social Determinants of Health , Humans , Canada , COVID-19/epidemiology , SARS-CoV-2 , Health Equity , Health Status Disparities , Pandemics , Urban Population
19.
BMC Public Health ; 24(1): 1738, 2024 Jun 29.
Article in English | MEDLINE | ID: mdl-38951834

ABSTRACT

Research indicates that COVID-19 has had adverse effects on the mental health of adolescents, exacerbating their negative psychological states. The purpose of this study is to investigate the impact of Physical Literacy (PL) on Negative Mental State caused by COVID-19 (NMSC) and identify potential factors related to NMSC and PL in Chinese adolescents. This cross-sectional study involved a total of 729 Chinese high school students with an average age of 16.2 ± 1.1 years. Participants' demographic data, PL data, and NMSC data were collected. PL and NMSC were measured using the self-reported Portuguese Physical Literacy Assessment Questionnaire (PPLA-Q), the Stress and Anxiety to Viral Epidemics-6 (SAVE-6), and the Fear of COVID-19 Scale (FCV-19). Adolescents in the current study demonstrated higher levels of NMSC and lower PL, with average scores of 3.45 and 2.26, respectively (on a scale of 5). Through multiple linear regression analysis, Motivation (MO), Confidence (CO), Emotional Regulation (ER), and Physical Regulation (PR) were identified as factors influencing NMSC in adolescents. The study findings contribute to providing guidance for actions aimed at alleviating NMSC among adolescents.


Subject(s)
COVID-19 , Resilience, Psychological , Adolescent , Female , Humans , Male , China/epidemiology , COVID-19/psychology , COVID-19/epidemiology , COVID-19/prevention & control , Cross-Sectional Studies , East Asian People , Health Literacy/statistics & numerical data , Mental Health , Surveys and Questionnaires
20.
BMC Infect Dis ; 24(1): 654, 2024 Jun 29.
Article in English | MEDLINE | ID: mdl-38951848

ABSTRACT

Vaccination against COVID-19 was integral to controlling the pandemic that persisted with the continuous emergence of SARS-CoV-2 variants. Using a mathematical model describing SARS-CoV-2 within-host infection dynamics, we estimate differences in virus and immunity due to factors of infecting variant, age, and vaccination history (vaccination brand, number of doses and time since vaccination). We fit our model in a Bayesian framework to upper respiratory tract viral load measurements obtained from cases of Delta and Omicron infections in Singapore, of whom the majority only had one nasopharyngeal swab measurement. With this dataset, we are able to recreate similar trends in URT virus dynamics observed in past within-host modelling studies fitted to longitudinal patient data.We found that Omicron had higher R0,within values than Delta, indicating greater initial cell-to-cell spread of infection within the host. Moreover, heterogeneities in infection dynamics across patient subgroups could be recreated by fitting immunity-related parameters as vaccination history-specific, with or without age modification. Our model results are consistent with the notion of immunosenescence in SARS-CoV-2 infection in elderly individuals, and the issue of waning immunity with increased time since last vaccination. Lastly, vaccination was not found to subdue virus dynamics in Omicron infections as well as it had for Delta infections.This study provides insight into the influence of vaccine-elicited immunity on SARS-CoV-2 within-host dynamics, and the interplay between age and vaccination history. Furthermore, it demonstrates the need to disentangle host factors and changes in pathogen to discern factors influencing virus dynamics. Finally, this work demonstrates a way forward in the study of within-host virus dynamics, by use of viral load datasets including a large number of patients without repeated measurements.


Subject(s)
COVID-19 Vaccines , COVID-19 , SARS-CoV-2 , Vaccination , Humans , COVID-19/immunology , COVID-19/prevention & control , COVID-19/virology , COVID-19/epidemiology , SARS-CoV-2/immunology , COVID-19 Vaccines/immunology , COVID-19 Vaccines/administration & dosage , Middle Aged , Aged , Adult , Singapore/epidemiology , Age Factors , Viral Load , Young Adult , Bayes Theorem , Models, Theoretical , Male , Aged, 80 and over , Female , Adolescent
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