SARS-CoV-2 Infection Risk Factors in Beijing during November 2022: A Case Control Study

Since the outbreak of COVID-19, countries and regions worldwide have implemented multifaceted prevention and control measures, including vaccinations, antiviral drugs, mask wearing, and social distancing. However, omicron variants, with significantly increased endogenous and occult transmission, have significantly complicated epidemic prevention and control[1]. Thus, studying the key and difficult aspects that affect the effectiveness of prevention and control of omicron can provide a reference for the spread of other respiratory infectious diseases. SARS-CoV-2 infection is influenced by multiple factors such as viral transmission, ventilation, personal protective equipment (PPE), population density, and contact time[2].