| Early transmissibility assessment of the N501Y mutant strains of SARS-CoV-2 in the United Kingdom, October to November 2020 | Eurosurveillance | 2021 | 395 |
| COVID-19 Vaccination Hesitancy in the United States: A Rapid National Assessment | Journal of Community Health | 2021 | 348 |
| Increased transmissibility and global spread of SARS-CoV-2 variants of concern as at June 2021 | Eurosurveillance | 2021 | 298 |
| Updating guidance for reporting systematic reviews: development of the PRISMA 2020 statement | Journal of Clinical Epidemiology | 2021 | 279 |
| Evidence for antibody as a protective correlate for COVID-19 vaccines | Vaccine | 2021 | 277 |
| Factors influencing variation in implementation outcomes of the redesigned community health fund in the Dodoma region of Tanzania: a mixed-methods study | BMC Public Health | 2021 | 275 |
| Transmission of SARS-CoV-2 by inhalation of respiratory aerosol in the Skagit Valley Chorale superspreading event | Indoor Air | 2021 | 274 |
| COVID-19 vaccine hesitancy in a representative working-age population in France: a survey experiment based on vaccine characteristics | Lancet Public Health, The | 2021 | 274 |
| Causes of blindness and vision impairment in 2020 and trends over 30 years, and prevalence of avoidable blindness in relation to VISION 2020: the Right to Sight: an analysis for the Global Burden of Disease Study | The Lancet Global Health | 2021 | 253 |
| Predictors of intention to vaccinate against COVID-19: Results of a nationwide survey | Vaccine | 2021 | 232 |
| Racial, Economic, and Health Inequality and COVID-19 Infection in the United States | Journal of Racial and Ethnic Health Disparities | 2021 | 206 |
| COVID-19 in Health-Care Workers: A Living Systematic Review and Meta-Analysis of Prevalence, Risk Factors, Clinical Characteristics, and Outcomes | American Journal of Epidemiology | 2021 | 205 |
| The PRISMA 2020 statement: An updated guideline for reporting systematic reviews | Journal of Clinical Epidemiology | 2021 | 201 |
| Vaccine hesitancy in the era of COVID-19 | Public Health | 2021 | 191 |
| Effects of the COVID-19 pandemic on maternal and perinatal outcomes: a systematic review and meta-analysis | The Lancet Global Health | 2021 | 189 |
| Non-compliance with COVID-19-related public health measures among young adults in Switzerland: Insights from a longitudinal cohort study | Social Science and Medicine | 2021 | 181 |
| Depression, Anxiety and Stress Among Indians in Times of Covid-19 Lockdown | Community Mental Health Journal | 2021 | 177 |
| Knowledge, Attitudes and Practices Towards COVID-19: An Epidemiological Survey in North-Central Nigeria | Journal of Community Health | 2021 | 173 |
| Willingness to get the COVID-19 vaccine with and without emergency use authorization | American Journal of Infection Control | 2021 | 173 |
| Indoor transmission of SARS-CoV-2 | Indoor Air | 2021 | 170 |
| Systematic review with meta-analysis of the accuracy of diagnostic tests for COVID-19 | American Journal of Infection Control | 2021 | 168 |
| COVID-19 vaccine hesitancy among medical students | Journal of Public Health | 2021 | 164 |
| How and why patients made Long Covid | Social Science and Medicine | 2021 | 163 |
| Humoral Response to the Pfizer BNT162b2 Vaccine in Patients Undergoing Maintenance Hemodialysis | Clinical Journal of the American Society of Nephrology: CJASN | 2021 | 159 |
| Cadmium toxicity in plants: Impacts and remediation strategies | Ecotoxicology and Environmental Safety | 2021 | 156 |
