Epidemics, pandemics and dentistry: a commentary

There is no doubt that epidemics and pandemics have transformed dentistry beyond recognition. In this commentary we recapitulate the possible reasons for the emergence of major global epidemics and pandemics, how and why they emerge, and the successful attempts of the dental profession to mitigate infectious transmission in the clinic, which in turn has metamorphosed our profession today. We also peer into the future of dentistry through the prism of the new conceptual approach of 'one world, one health' recently declared by the Centers for Disease Control (CDC). Finally, we discuss five realms of dentistry that have been irretrievably impacted by the recent COVID-19 pandemic, viz vaccines, point of care diagnostics, teledentistry, reinforced infection control, and dental pedagogy. CPD/Clinical Relevance: Vaccines and vaccinations have become integral to societal wellbeing and the prevention of global pandemics.

Adaptive reuse of closed malls for dementia programs and services: Community focus group feedback

The double societal hit of dementia and infectious disease outbreaks like COVID-19 have raised a convergence of concerns for the future of care settings for people living with dementia. Images of institutionalized older adults who are quarantined in closed settings have led developers, government agencies, and care administrators to search for innovative options to create more autonomy and quality of life in care settings while protecting the health of residents. This chapter describes the qualitative work being conducted by a Midwestern university research team, laying the groundwork for the conceptual adaptive reuse of an 800,000 square-foot closed mall site for centralized dementia programs, services, housing, and an on-site quarantine and medical center. Focus group outcomes from architects and developers highlighted five principle themes relating to the barriers and benefits of adaptive reuse for this model which include: mixed-use precedents, linking the old with the new, economic factors, development partnerships, and sustainable building practices. (PsycInfo Database Record (c) 2023 APA, all rights reserved)

The underrepresentation of palliative care in global guidelines for responding to infectious disease outbreaks: a systematic narrative review.

BACKGROUND: The importance of palliative care provision has been highlighted in previous humanitarian emergencies. This review aimed to examine the breadth and depth of palliative care inclusion within global guidelines for responding to infectious disease outbreaks. METHODS: The review was conducted using the Preferred Reporting Items for Systematic Reviews and Meta-Analysis guidelines. Electronic searches of MEDLINE, Embase, Cumulative Index to Nursing and Allied Health, PsychInfo and grey literature were performed. Inclusion criteria were guidelines (recommendations for clinical practice or public health policy) for responding to infectious disease outbreaks in the general adult population. Results were limited to the English language, between 1 January 2010 and 17 August 2020. Analysis of the included articles involved assessing the breadth (number of palliative care domains covered) and depth (detail with which the domains were addressed) of palliative care inclusion. RESULTS: A total of 584 articles were retrieved and 43 met the inclusion criteria. Two additional articles were identified through handsearching. There was limited inclusion of palliative care in the guidelines examined. CONCLUSIONS: There is an opportunity for the development of guidelines that include information on palliative care implementation in the context of infectious disease outbreaks in order to reduce the suffering of key vulnerable populations worldwide.

Preferences and values for government policies on infectious disease outbreaks and epidemics for the Japanese population: a conjoint analysis.

AIMS: To investigate the preferences of the Japanese population for government policies expected to address infectious disease outbreaks and epidemics. METHODS: We performed a conjoint analysis based on survey data in December 2022 (registration number: UMIN000049665). The attributes for the conjoint analysis were policies: tests, vaccines, therapeutic drugs, behavior restrictions (e.g. self-restraint or restrictions on the gathering or travel of individuals and the hours of operation or serving of alcoholic beverages in food/beverage establishments), and entry restrictions (from abroad), and monetary attribute: an increase in the consumption tax from the current 10%, to estimate the monetary value of the policies. A logistic regression model was used for the analysis. RESULTS: Data were collected from 2,185 respondents. The accessibility of tests, vaccines, and therapeutic drugs was preferred regardless of the accessibility level. The value for accessibility of drugs to anyone at any medical facility was estimated at 4.80% of a consumption tax rate, equivalent to JPY 10.5 trillion, which was the highest among the policies evaluated in this study. The values for implementing behavior or entry restrictions were negative or lower than those for tests, vaccines, and drugs. LIMITATIONS: Respondents chosen from an online panel were not necessarily representative of the Japanese population. Because the study was conducted in December 2022, a period during the coronavirus disease 2019 (COVID-19) pandemic, the results may reflect the situation at that time and potentially be subject to rapid change. CONCLUSIONS: Among the policy options evaluated in this study, the most preferred option was easily accessible therapeutic drugs and their monetary value was substantial. Wider accessibility of tests, vaccines, and drugs was preferred over behavior and entry restrictions. We believe that the results provide information for policymaking to prepare for future infectious disease epidemics and for assessing the response to COVID-19 in Japan.

Potential threats of cholera amidst COVID pandemic in the Democratic Republic of Congo; bridging the gaps: a review.

Cholera, being a global health issue has remarkably affected the wellness of the people, especially in the Democratic Republic of Congo (DRC). This has worsened during the COVID-19 pandemic, and it could be more if no concrete Intervention is done to curtail the outbreak. The authors reviewed past and present literatures on cholera and COVID-19 from the year 2013-2023 in well renowned scientific journals such as PUBMED, ResearchGate, Google Scholar. Database servers of these journals were accessed based on their permissions. From this search the authors found that, cholera is at its peak amidst COVID in DRC. Between the 10 March 2020 to the 10 March 2022, DRC reported a total of 86 462 cases of COVID-19 in 314 health zones in all 26 provinces of the country, with 1335 deaths recorded. And since the beginning of 2022, 6692 suspected cholera cases including 107 deaths have been reported in 54 health zones in 11 provinces of DRC, compared with 3681 suspected cases and 91 deaths reported during the same period in 2021 in 67 health zones in 14 provinces in the country. The authors realized that despite all efforts to mitigate the spread of cholera in DRC by the Congolese government and the non-governmental organizations in the country, there are still some gaps required to be filled, such as; limited community mobilizations and awareness campaigns about the signs and symptoms of cholera and COVID-19, unavailability of free cholera and COVID-19 vaccines to all the Congolese populations as well as association of witchcraft to diseases. etc. Hence, to mitigate this menace, the authors urge the Congolese government to utilize research implementation strategies such as increase mass awareness campaigns on cholera and COVID among the Congolese populations as well as training workshops for the religious and traditional leaders as well as the healthcare providers in the country for a better diagnosis and treatment of these diseases.

Ventilation strategies based on an aerodynamic analysis during a large-scale SARS-CoV-2 outbreak in an acute-care hospital.

BACKGROUND: This study aimed to investigate ventilation strategies to prevent nosocomial transmission of coronavirus disease 2019 (COVID-19). METHODS: We conducted a retrospective epidemiological investigation of a severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) outbreak in a teaching hospital (February-March 2021). The largest outbreak ward was studied, and measurements were taken to determine the pressure difference and air change per hour (ACH) of the rooms. Airflow dynamics were assessed using an oil droplet generator, indoor air quality sensor, and particle image velocimetry in the index patient's room, corridor, and opposite rooms, by varying the opening and closing of windows and doors. RESULTS: During the outbreak, 283 COVID-19 cases were identified. The SARS-CoV-2 spread occurred sequentially from the index room to the nearest room, especially the opposite. The aerodynamic study demonstrated that droplet-like particles in the index room diffused through the corridor and the opposite room through the opening door. The mean ACH of the rooms was 1.44; the air supply volume was 15.9% larger than the exhaust volume, forming a positive pressure. Closing the door prevented diffusion between adjacent rooms facing each other, and natural ventilation reduced the concentration of particles within the ward and minimised their spread to adjacent rooms. CONCLUSIONS: Spread of droplet-like particles between rooms could be attributed to the pressure difference between the rooms and corridor. To prevent spread of SARS-CoV-2 between rooms, increasing the ACH in the room by maximising ventilation and minimising the positive pressure through supply/exhaust control and closing the room door are essential.

A case of Kretschmer's sensitive delusion related to COVID-19 pandemic

Presents a case report of a 45-year-old woman with a brief psychotic disorder, in which pathogeny was an effect of the pandemic, modulating a classic syndrome described more than one century ago by Ernst Kretschmer. During the mandatory screening before hospital admission, the patient tested positive for SARS-CoV-2. Basic tests were performed, including blood alcohol concentration, urinary drug screening, and brain computerized tomography - all normal. Regarding her premorbid personality, she had cluster C personality traits. The discharge diagnosis was a Brief psychotic disorder. Other differential diagnoses were considered such as schizophreniform disorder, psychotic depression, bipolar disorder, late-onset schizophrenia, but the rapid onset of the picture, the brief resolution, the absence of dominant affective symptomatology, and the absence of negative symptomatology led to assume that it was more likely a brief reactive psychosis. antipsychotic medication was suspended gradually and she didn't present any recurrence of symptoms. In this case report, the author reviews a classic nosological entity, commonly forgotten, revived by a very current and particular social situation (the COVID-19 pandemic), whose social conditionings can affect mental health. The author emphasizes the importance of a thorough anamnesis with a complete evaluation of the premorbid character, which allowed an early intervention and subsequent better prognosis. (PsycInfo Database Record (c) 2023 APA, all rights reserved)

Australia to set up CDC

PUBLIC HEALTH ;Australia is establishing a Centre for Disease Control (CDC), joining the majority of advanced countries in having a national health agency. Australia's states and territories will retain responsibility for public health;the new CDC is meant to provide nationwide surveillance of disease outbreaks and help improve coordination, "something that was sorely lacking during COVID", says Ben Marais, an infectious disease specialist at the University of Sydney. [Extracted from the article] Copyright of Science is the property of American Association for the Advancement of Science and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full . (Copyright applies to all s.)

Cross-Sectional Survey of Views on COVID-19 and Its Vaccines among Pregnant Women

Objective The objective of this study is to evaluate the acceptance of pregnant women with regards to coronavirus disease 2019 (COVID-19) vaccination during pregnancy and to identify any significant changes in their anxiety and knowledge on COVID-19 compared to our previous study. Methods This cross-sectional survey was performed in the antenatal clinics of United Christian Hospital and Tseung Kwan O Hospital of Hong Kong, China. Questionnaires were distributed to pregnant women for self-completion when attending follow-up from August to October 2021. Apart from basic demographic data, the questionnaire comprised of questions including knowledge on COVID-19 and its vaccines in pregnancy as well as attitudes and behaviors of pregnant women and their partners toward COVID-19. Continuous variables were analyzed by Student's test and Levene's test was used to confirm normal distribution and homogeneity of variance for continuous variables, whereas categorical variables were analyzed by the Chi-squared test or Fisher's exact test as appropriate. A P value of <0.05 was considered to be statistically significant. Results A total of 816 completed questionnaires were included for analysis. Pregnant women were less worried about COVID-19 in the current survey as compared to the last survey (393/816, 48.2% vs. 518/623, 83.1%, P?<?0.001). Fewer pregnant women believed that pregnancy were more susceptible to contract SARS-CoV-2 as compared to the last survey (265/816, 32.5% vs. 261/623, 41.9%, P?<?0.001). They have significant knowledge gap and concerns about COVID-19 vaccines. Nearly half of the participants believed that pregnant women cannot have COVID-19 vaccination (402/816, 49.3%) and it is unsafe to fetus (365/816, 44.7%). Around a third of women perceived that they were more prone to the side effects and complications of COVID-19 vaccines than the general population (312/816, 38.2%) and did not recognize that maternal COVID-19 vaccination could effect transferral of antibodies to the fetus to promote postnatal passive immunity (295/816, 36.2%). Most of them had not been vaccinated (715/816, 87.6%) and only (12/715) 1.7% of them would consider vaccination during pregnancy. Conclusion Despite the local and international recommendations for pregnant women to be vaccinated, the uptake of COVID-19 vaccines during pregnancy remained extremely low. Efforts should be made to effectively provide information about the safety and benefits of COVID-19 vaccines during pregnancy. There is an urgent need to booster vaccination rates in pregnant women to avoid excessive adverse pregnancy outcomes related to COVID-19.Copyright © the Author(s). Published by Wolters Kluwer Health, Inc.

COVID-19 outbreak in a religious village community in Republic of Korea and risk factors for transmission.

OBJECTIVES: This study aimed to assess the scale and transmission patterns of coronavirus disease 2019 (COVID-19) in a religious village community in South Korea, to determine the risk factors of transmission, and to evaluate vaccine effectiveness. METHODS: An epidemiological survey was conducted, and data were collected and analyzed from 602 villagers in the religious village community. Multivariate logistic regression analysis was used to identify the risk factors for COVID-19 transmission and to evaluate vaccine effectiveness. RESULTS: The outbreak attack rate was 72.1% (434/602). The attack rate was high among women in their 60s, the unemployed, residents living near religious facility (<500 m), and the unvaccinated. Age, the distance between religious facility and residences, and the absence of vaccination were identified as risk factors for transmission. Vaccine effectiveness was 49.0%, and the highest effectiveness was seen in the age group of 59 years or younger (65.8%). CONCLUSION: This village community was isolated, with little communication with the outside world. However, the frequency of close contact between residents was relatively high, contributing to the spread of COVID-19 in the village even with relatively short exposure. Vaccination rates in the village community were also lower than those in the general public. Public health authorities should consider the potential impact of cultural factors, including religion, that could lead to the exponential spread of COVID-19 in closed village communities.

A continent-wide effort and solidarity at curbing COVID-19 pandemic: the Africa task force for novel coronavirus (AFTCOR) infection prevention and control technical working group's experience.

A continent-wide Africa Task Force for Coronavirus with its six technical working groups was formed to prepare adequately and respond to the novel Coronavirus disease (COVID-19) outbreak in Africa. This research in practice article aimed to describe how the infection prevention and control (IPC) technical working group (TWG) supported Africa Centre for Disease Control and Prevention (Africa CDC) in preparedness and response to COVID-19 on the continent. To effectively address the multifaceted IPC TWG mandate of organizing training and implementing rigorous IPC measures at healthcare service delivery points, the working group was sub-divided into four sub-groups-Guidelines, Training, Research, and Logistics. The action framework was used to describe the experiences of each subgroup. The guidelines subgroup developed 14 guidance documents and two advisories; all of which were published in English. In addition, five of these documents were translated and published in Arabic, while three others were translated and published in French and Portuguese. Challenges faced in the guidelines subgroup included the primary development of the Africa CDC website in English, and the need to revise previously issued guidelines. The training subgroup engaged the Infection Control Africa Network as technical experts to carry out in-person training of IPC focal persons and port health personnel across the African continent. Challenges faced included the difficulty in conducting face-to-face IPC training and onsite technical support due to the lockdown. The research subgroup developed an interactive COVID-19 Research Tracker on the Africa CDC website and conducted a context-based operation and implementation research. The lack of understanding of Africa CDC's capacity to lead her own research was the major challenge faced by the research subgroup. The logistics subgroup assisted African Union (AU) member states to identify their IPC supply needs through capacity building for IPC quantification. A notable challenge faced by the logistics subgroup was the initial lack of experts on IPC logistics and quantifications, which was later addressed by the recruitment of professionals. In conclusion, IPC cannot be built overnight nor can it be promoted abruptly during outbreaks of diseases. Thus, the Africa CDC should build strong national IPC programmes and support such programmes with trained and competent professionals.

Pandemic preparedness of diagnostic radiographers during COVID-19: A scoping review.

INTRODUCTION: As chest imaging is a tool for detecting coronavirus disease 2019 (COVID-19), diagnostic radiographers are a key component of the frontline workforce. Due to its unforeseen nature, COVID-19 has challenged radiographers' preparedness in combating its effects. Despite its importance, literature specifically investigating radiographers' readiness is limited. However, the documented experiences are prognostic of pandemic preparedness. Hence, this study aimed to map this literature by addressing the question: 'what does the existing literature reveal about the pandemic preparedness of diagnostic radiographers during COVID-19?'. METHODS: Using Arksey and O'Malley's framework, this scoping review searched for empirical studies in MEDLINE, Embase, Scopus, and CINAHL. Consequently, 970 studies were yielded and underwent processes of deduplication, title and abstract screening, full-text screening, and backward citation searching. Forty-three articles were deemed eligible for data extraction and analysis. RESULTS: Four themes that reflected pandemic preparedness were extrapolated: infection control and prevention, knowledge and education, clinical workflow, and mental health. Notably, the findings highlighted pronounced trends in adaptation of infection protocols, adequate infection knowledge, and pandemic-related fears. However, inconsistencies in the provision of personal protective equipment, training, and psychological support were revealed. CONCLUSION: Literature suggests that radiographers are equipped with infection knowledge, but the changing work arrangements and varied availability of training and protective equipment weakens their preparedness. The disparate access to resources facilitated uncertainty, affecting radiographers' mental health. IMPLICATIONS FOR PRACTICE: By reiterating the current strengths and weaknesses in pandemic preparedness, the findings can guide clinical practice and future research to correct inadequacies in infrastructure, education, and mental health support for radiographers in the current and future disease outbreaks.

Outbreak report of SARS-CoV-2 infection by airborne transmission: Epidemiologic and molecular evidence. / Reporte de un brote de infección por SARS-CoV-2 por transmisión aérea: evidencia epidemiológica y molecular

INTRODUCTION: It has been shown that the transmission of SARS-CoV-2 occurs mainly by air, and the risk of infection is greater in closed spaces. OBJECTIVE: To describe the epidemiology, virology and molecular characterization of a COVID-19 outbreak at a closed vaccination point during the third wave of SARS-CoV-2 in Colombia. MATERIALS AND METHODS: Diagnostic tests, interviews, sampling, cell cultures and viral sequencing were carried out, the latter being molecular characterization and lineage identification. RESULTS: Seven workers were positive for SARS-CoV-2; among these, 3 samples were analyzed, plus an additional sample belonging to the mother of the presumed index case; all samples were identified with lineage B.1.625, with a maximum of 2 nucleotides difference between them. CONCLUSIONS: Variant B.1.625 was identified as the cause of the COVID-19 outbreak, and a co-worker was also identified as the index case. Unexpectedly, attending a vaccination day became a risk factor for acquiring the infection.

Introducción. Se ha demostrado que la transmisión de SARS-CoV-2 se produce principalmente por vía aérea y el riesgo de infección es mayor en espacios cerrados con alta concentración de personas; este último factor se presentó en algunos de los puestos de vacunación de la ciudad de Medellín. Objetivo. Describir la epidemiología, virología y caracterización molecular de un brote de COVID-19 en un punto de vacunación cerrado durante la tercera ola de SARS-CoV-2 en Colombia. Materiales y métodos. Se realizaron test diagnósticos, entrevistas, toma de muestras, aislamiento viral y secuenciación genómica. Con esta última, se hizo la caracterización molecular y se identificó el linaje. Resultados. Siete trabajadores fueron positivos para SARS-CoV-2, y de estos, tres muestras fueron secuenciadas, más una muestra adicional perteneciente a la madre del presunto caso índice. Todas las muestras fueron identificadas con el linaje B.1.625, con un máximo de dos nucleótidos de diferencia entre ellas. Conclusiones. Se identificó la variante B.1.625 como la causante del brote de COVID-19, y también un compañero de trabajo fue identificado como el caso índice. De forma imprevista, asistir a una jornada de vacunación se convirtió en un factor de riesgo para adquirir la infección.

Success both in rescue and scientific research: comparison of medical papers published by Chinese in two epidemics. TT -:.

Facing the unprecedented epidemic situation of novel coronavirus pneumonia (COVID-19), medical workers in China have not only successfully controlled the spread of the epidemic in Chinese mainland in just 4 months, but also have made great achievements in scientific research on COVID-19. In the past 4 months, a total of 1 033 English papers about COVID-19 written by Chinese scholars have been published and included in PubMed database, which is 6.6 times the number of articles published in 2003. The proportion of papers published by authors in Chinese mainland has increased from 48.7% (76/156) during the SARS epidemic in 2003 to 84.8% (876/1 033) with 4 months in 2020. The papers were also published significantly earlier than before. Chinese researchers identified the novel coronavirus that caused the outbreak less than 1 month after the COVID-19 outbreak (on January 7, 2020) and reported it to the WHO. They also published articles on the genetic sequence and transmission dynamics of the virus and clinical characteristics of COVID-19 patients in that month. China pays more attention to drug safety of patients. The proportion of English and Chinese literature published by pharmaceutical authors increased from 0 and 0.2% (10/4 023) in 2003 to 2.3% (24/1 032) and 9.3% (215/2 317) from January to April in 2020, respectively. China has not only become a model for the world in epidemic control, but also made important contributions to the relevant academic research.Copyright © 2020 by the Chinese Medical Association.

Pay attention to the medication safety of patients during the period of coronavirus disease 2019 epidemic prevention.

The coronavirus disease 2019 (COVID-19) epidemic is facing the most critical situation. As of January 11, 2021, there have been nearly 90 million confirmed cases worldwide and nearly 2 million deaths. The local epidemic situation in China is sporadic and locally clustered, and the situation of epidemic prevention is difficult and complicated. In this situation, there are many problems in medication safety of patients, such as safety issues in off-label medication and compassionate medication of COVID-19 treatment, safety problems in the combination use of drugs for COVID-19 and drugs for other diseases, monitoring of adverse drug reactions in COVID-19 treatment, the safety issues in self-purchased drugs for prevention and treatment of COVID-19, and the medication safety in patients with other diseases during the epidemic. Therefore, it is necessary to pay more attention to the medication safety of patients to fight the epidemic scientifically and to win a greater victory in the fight against the COVID-19 epidemic at a smaller price.Copyright © 2021 Chinese Medical Association

A local outbreak as mirror-like scenario for COVID-19 worldwide progression. Clinical presentation to the Emergency Department during one of the first sub-regional outbreak in Italy A lesson to learn

BACKGROUND: One of the most precocious Italian COVID-19 outbreaks began in February 2020 in Medicina, a small town in the province of Bologna. We compared the characteristics of different cohorts, to identify potential predictive factors for outcome: patients of Medicina outbreak versus those of the surrounding district (Imola), and before or after the local medical intervention. METHOD(S): Between March the 3rd and April the 9th, 2020 167 adults with COVID-19 were admitted to the Emergency Department (ED) (78 from Medicina cluster, 89 from Imola district). Data at ED presentation were collected;hospitalized patients were followed until death or discharge. RESULT(S): Medicina and Imola cohorts were similar in age, main comorbidities, clinical presentation, laboratory tests, arterial blood gas analysis (ABG), death and acute respiratory distress syndrome (ARDS) rates. Age, hypertension, diabetes, chronic obstructive pulmonary disease, dyspnea, body temperature, quickSOFA Score, elevated C-reactive protein (CRP), creatinine, urea, DELTA A-a O2, respiratory rate and FiO2 were associated with death and ARDS. Elevated Glasgow Coma Scale, diastolic blood pressure, oxygen peripheral saturation, P/F and pH were associated with patient survival and protective from ARDS. After the intervention in Medicina district, patients presenting at ED were younger and with long-lasting symptoms;CRP values were significantly lower, ABG and respiratory clinical parameters were less severely impaired. These differences did not affect the outcome. CONCLUSION(S): Since the results of our study are consistent with worldwide evidences, we suggest that the early insight of a small local SARS-CoV-2 outbreak can be representative and predictive of the subsequent course of the virus in wider areas. This must be kept in mind to manage next epidemic waves.Copyright © 2022 EDIZIONI MINERVA MEDICA.

Tolerance Increase in Escherichia coli O157:H7 and Methicillin-Resistant Staphylococcus Aureus USA300 Exposed to Low-Power Continuous Ultraviolet Radiation from Narrow-Wavelength Sources

Escherichia coli O157:H7 is a major cause of foodborne disease outbreaks throughout the world, while methicillin-resistant Staphylococcus aureus (MRSA) is responsible for many difficult-to-treat infections in humans. Ultraviolet (UV) irradiation is commonly used for disinfection in food processing, medical facilities, and water treatment to prevent the transmission of these pathogen. With increased use of UV disinfection technologies over the last few years because of COVID-19 and concerns about other communicable disease, it has become a concern that microbial species could develop tolerance to UV irradiation, especially when it is applied continuously. To elucidate the effect of continuous UV exposure at different wavelengths and power levels on the tolerance development of bacteria, Escherichia coli O157:H7 and MRSA)USA300 growths were investigated by continuously exposing inoculated agar plates to six different commercially available UV sources at wavelengths of 222 nm, 254 nm, 275 nm, and 405 nm. The agar plates in these experiments were partially covered by a thin acrylic sheet, which provided either complete protection from the UV to the cells directly under the sheet, no protection if significantly away from the sheet, or partial protection near the edges of the sheet due to shading or small amounts of UV reflection under the sheet at the edges. In these experiments, tolerant cells of E. coli and S. aureus were found from the 222 nm, the 405 nm, and one of the 254 nm sources. Upon examination of the power of each UV source, it was shown that the 275 nm and 254 nm sources that resulted in no tolerant cells had surface power densities [at 25 cm (10 in.)] that were more than 10-200 times greater than those that had tolerant cells. These results suggests that bacterial cells have a higher chance to develop UV tolerance under lower power UV sources (under the experimental conditions in our laboratory). Genome investigation of the tolerant colonies revealed that there are no significant differences between the cells that developed tolerance and the original organism, hinting at the need to explore the role of epigenetics mechanisms in the development of UV tolerance in these bacteria. © 2023 American Society of Civil Engineers.

Evaluation of Risk Perception of COVID-19 Disease: A Community-Based Participatory Study.

OBJECTIVE: How people behave in a crisis depends on their understanding and evaluation of risk and vulnerability. Therefore, this study was conducted to investigate the Iranians' risk perception of coronavirus disease (COVID-19). METHODS: An online survey was applied, which resulted in the collection of information on demographics, the 5 dimensions of risk perception (cognitive, political, social, cultural, and emotional), and trust in the government among the Iranian users of social networks. Data were analyzed by descriptive and analytical tests of SPSS (IBM Corp, Armonk, NY) software, and confirmatory factor analysis of Amos software. RESULTS: A total of 364 persons from 20 provinces completed the questionnaire during February 25 to March 2, 2020. More than 80% of the participants believed that negligence and lack of close supervision of the authorities have led to the spread of COVID-19. The mean (SD) risk perception was 58.77 (± 10.11), indicating the medium level of risk perception of people. The second-order confirmatory factor analysis also indicated that cultural dimension had the highest positive correlation (0.96), emotional dimension had the highest negative correlation (-0.65), and social dimension had the least correlation with the risk perception model (0.08). CONCLUSION: Iranians' risk perception of the COVID-19 outbreak is not optimal, and it seems necessary to improve it.

Assessing the impact of local context and priorities regarding domestic disease outbreaks and imported risk on early pandemic response: Cross-continental comparisons.

Introduction: Containment and closure policies are effective measures used in the early stages of a highly transmissible global pandemic such as COVID-19 to mitigate the spread and reduce transmissions. However, these policies can have negative impacts on the economy and personal freedom. Governments must carefully consider the necessity of increasing their stringency. Local contexts and priorities regarding domestic disease outbreaks and the risk of imported cases from other countries may vary among different countries, and could influence the decision to increase containment measures. Thus, this study aimed to differentiate the impacts of these affecting factors on the stringency of governmental containment measures through cross-continental comparisons. Methods: This study utilized a zero/one inflated beta (ZOIB) regression model to investigate how domestic epidemic, imported risk, and local context affect government responses to a pandemic. We used a country's weekly confirmed case and death numbers as a measure of its domestic threat. The imported risk was measured using a combination of weekly new cases in each country and the air passenger traffic between countries. Results: The findings indicate that domestic case numbers are a primary concern for governments when deciding to increase policy stringency. Countries with higher development levels tend to implement stricter policies as they can better handle the negative impacts. Additionally, there is an interaction between case numbers and development level, with countries at the second or third highest development level focusing more on domestic outbreaks than imported risks, while those at the highest level have similar concerns for both. Conclusions: We concluded that most countries adjust policies' stringency majorly based on the variation of domestic case number rather than the other pandemic factors and the countries with a high development level tend to implement strict policies since their socio-economical condition could afford such policies. These insights can aid policymakers in improving containment and closure policies for future pandemics.