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While the efficacy of coronavirus disease 2019 (COVID-19) vaccines has been evaluated in numerous trials, comprehensive evidence on how protection by different vaccines has varied over time remains limited. We aimed to compare protective effects of different vaccines against different viral variants. To achieve this, we searched Medline, Cochrane Library and Embase for randomized controlled trials assessing the efficacy of COVID-19 vaccines. Forest plots using Mantel–Haenszel and random-effects models were generated showing risk ratios (RRs) and 95% CIs by vaccines and variants. We included 36 studies with 90 variant-specific primary outcomes. We found a RR of 0.26 (95% CI 0.21 to 0.31) against all variants overall, with the highest protective effects against the wild-type (RR 0.13; 95% CI 0.10 to 0.18), followed by Alpha (RR 0.26; 95% CI 0.18 to 0.36), Gamma (RR 0.34; 95% CI 0.21 to 0.55), Delta (RR 0.39; 95% CI 0.28 to 0.56) and Beta (RR 0.49; 95% CI 0.40 to 0.62) variants. Nucleic acid vaccines showed the highest protection levels against all variants (RR 0.11; 95% CI 0.08 to 0.15), followed by protein subunit, inactivated virus and viral vector. In conclusion, we found high but heterogenous levels of protection for most COVID-19 vaccines, with decreasing protective effects for vaccines based on traditional technologies as SARS-CoV-2 variants emerged over time. Novel nucleic acid-based vaccines offered substantially higher and more consistent protection. [ABSTRACT FROM AUTHOR]

Objectives Research on family caregiving for older adults has largely focused on primary caregivers. We identify caregiving task-sharing patterns among multiple caregivers, including family members and live-in hired workers. In addition, we investigate caregiver and care-recipient characteristics associated with these patterns. Methods We interviewed 278 primary family caregivers of home-dwelling older adults in Singapore about who provides what assistance across 3 domains: activities of daily living, health and social services use, and socioemotional and other needs. Latent class analysis was used to identify caregiving task-sharing patterns. Results Three patterns were identified: (a) "Shared-Diverse" (39%)—multiple caregivers assisting in all 3 domains, (b) "Shared-Domestic" (32%)—multiple caregivers assisting with activities of daily living and socioemotional and other needs, and (c) "Solo-Diverse" (29%)—a sole caregiver assisting in all 3 domains. "Solo-Diverse" caregivers were less likely to be employed and had higher depressive symptoms relative to "Shared-Diverse" primary family caregivers. Discussion The predominance of caregiving task-sharing patterns involving multiple caregivers calls for expansion of research, policies, and programs beyond primary caregivers. Greater attention should be given to how families and live-in hired workers share caregiving tasks for older adults, and how this varies across cultural settings, especially in familial Asian societies. The findings further highlight the vulnerabilities of solo caregivers, whose employment capacity and mental health may be adversely affected by their caregiving duties. Policy-makers should ensure that solo caregivers have access to support programs that address their financial and mental health needs. [ABSTRACT FROM AUTHOR]

BACKGROUND: In 2022, many universities transitioned from virtual learning back to in-person teaching. Significant changes in working conditions, along with COVID-19-related anxiety during the pandemic, might impact the well-being of lecturers. OBJECTIVE: This study aims to assess the perceived stress, self-rated physical and occupational health of Vietnamese lecturers in 2022 compared to the pre-pandemic levels, and to identify their associating factors. METHOD: This is a cross-sectional study conducted in May–June 2022 through an online survey questionnaire. A sample of 425 university lecturers were included. Participants' stress levels were assessed using the Perceived Stress Scale. Participants were asked to compare their current physical and occupational health with before the pandemic. Explanatory variables included (1) COVID-19 exposure; and (2) perceptions of changes in working environment due to the pandemic. Multivariable ordinal least squared regression analyses were used to estimate the coefficient and 95% confidence intervals for the associations between COVID-19 exposure variables, work conditions, and each outcome. RESULTS: Our findings indicated that over 60% of participants experienced moderate stress, while nearly half reported worsened physical and occupational health during the pandemic. Gender, age, perceptions of workload, workplace safety, COVID-19 infection, and incentive programs were significant factors associated with higher stress levels and worse self-rated health. CONCLUSION: To ensure occupational safety and support lecturers as they return to in-person classes, it is crucial to provide appropriate psychological and health support services. [ABSTRACT FROM AUTHOR]

During the first 6 months of 2020, severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) spread to almost all countries and infected [approximately equal to] 4 million persons worldwide (1). Air [...]

Background One hundred days after severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) was first reported in Vietnam on 23 January, 270 cases were confirmed, with no deaths. We describe the control measures used by the government and their relationship with imported and domestically acquired case numbers, with the aim of identifying the measures associated with successful SARS-CoV-2 control. Methods Clinical and demographic data on the first 270 SARS-CoV-2 infected cases and the timing and nature of government control measures, including numbers of tests and quarantined individuals, were analyzed. Apple and Google mobility data provided proxies for population movement. Serial intervals were calculated from 33 infector-infectee pairs and used to estimate the proportion of presymptomatic transmission events and time-varying reproduction numbers. Results A national lockdown was implemented between 1 and 22 April. Around 200 000 people were quarantined and 266 122 reverse transcription polymerase chain reaction (RT-PCR) tests conducted. Population mobility decreased progressively before lockdown. In total, 60% (163/270) of cases were imported; 43% (89/208) of resolved infections remained asymptomatic for the duration of infection. The serial interval was 3.24 days, and 27.5% (95% confidence interval [CI], 15.7%-40.0%) of transmissions occurred presymptomatically. Limited transmission amounted to a maximum reproduction number of 1.15 (95% CI,.·37–2.·36). No community transmission has been detected since 15 April. Conclusions Vietnam has controlled SARS-CoV-2 spread through the early introduction of mass communication, meticulous contact tracing with strict quarantine, and international travel restrictions. The value of these interventions is supported by the high proportion of asymptomatic and imported cases, and evidence for substantial presymptomatic transmission. [ABSTRACT FROM AUTHOR]

To assess the role of in-flight transmission of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), we investigated a cluster of cases among passengers on a 10-hour commercial flight. Affected persons were passengers, crew, and their close contacts. We traced 217 passengers and crew to their final destinations and interviewed, tested, and quarantined them. Among the 16 persons in whom SARS-CoV-2 infection was detected, 12 (75%) were passengers seated in business class along with the only symptomatic person (attack rate 62%). Seating proximity was strongly associated with increased infection risk (risk ratio 7.3, 95% CI 1.2-46.2). We found no strong evidence supporting alternative transmission scenarios. In-flight transmission that probably originated from 1 symptomatic passenger caused a large cluster of cases during a long flight. Guidelines for preventing SARS-CoV-2 infection among air passengers should consider individual passengers' risk for infection, the number of passengers traveling, and flight duration. [ABSTRACT FROM AUTHOR]

Purpose: The purpose of the study was to explore how caring for older adults with both diabetes and functional limitations impacts caregiver depressive symptoms and whether this impact is moderated by caregivers' expressive social support and psychological resilience., Method: Cross-sectional data of 278 dyads, each comprising an older adult with functional limitations and his/her primary family caregiver were analyzed. Older adult diabetes status (yes/no) was based on ever-diagnosis of diabetes. Caregiver depressive symptoms, expressive social support, and psychological resilience were measured using standard scales. Multivariable linear regression was used to assess the association of interest and its moderation by caregiver expressive social support and psychological resilience., Results: Caregivers of older adults with both diabetes and functional limitations had a higher depressive symptoms score compared to caregivers of older adults with only functional limitations. This association was inversely moderated by caregiver expressive social support. As caregiver expressive social support increased, the difference in depressive symptoms between caregivers of older adults with diabetes and functional limitations and caregivers of older adults with only functional limitations reduced., Conclusion: Family caregivers of older adults with functional limitations and diabetes have a higher depressive symptoms score. However, enhancing caregiver expressive social support could mitigate this risk. Service providers should prioritize support for caregivers in such vulnerable situations and strive to enhance their expressive social support., Competing Interests: Declaration of Conflicting InterestsThe authors declare no conflict of interest.

Surveillance is the backbone of any response to an infectious disease outbreak, and comprehensive evaluation of surveillance systems is crucial. However, structured evaluations of surveillance systems during the COVID-19 pandemic are scarce. We conducted a after action review (AAR) of the performance of the COVID-19 surveillance system in Quang Ninh Province, Vietnam, during 2020 using the COVID-19-specific AAR methodology developed by the World Health Organization in combination with guidance from the US Centers for Disease Control and Prevention (CDC). We conducted a stakeholder survey, document reviews, and key informant interviews with staff from Quang Ninh CDC's COVID-19 surveillance system. The COVID-19 surveillance system was based on the pre-existing surveillance system in the province. The system's strengths were early preparation for emergency response, strong governance and central coordination, and multidisciplinary collaboration. Stakeholders agreed that the system proved useful and adaptive to the fast-evolving COVID-19 situation but was weakened by overly complex systems, redundant administrative processes, unclear communication channels, and lack of resources. Overall, the surveillance systems in Quang Ninh province proved effective in containing COVID-19 and adaptive in a fast-changing epidemiological context. Several recommendations were made based on identified areas of concern that are of relevance for COVID-19 surveillance systems in Vietnam and similar settings.