SARS-CoV-2 (COVID-19) superspreader events

BACKGROUND & OBJECTIVES: A significant number of reported COVID-19 cases can be traced back to superspreader events (SSEs), where a disproportionally large number of secondary cases relative to the standard reproductive rate, R0, are initiated. Although a superspreader is an individual who undergoes more viral shedding and transmission than others, it appears likely that environmental factors have a substantial role in SSEs. We categorise SSEs into two distinct groups: ‘societal’ and ‘isolated’ SSEs. METHODS: We summarise SSEs that have occurred using multiple databases that have been cross referenced to ensure numbers are as reliable as we can ascertain. This enables more focussed and productive control of the current pandemic and future pandemics, especially as countries and regions ease lockdown restrictions. RESULTS AND DISCUSSION: ‘Societal’ SSEs pose a significant threat as members of the event are free to mingle and can infect individuals in the outside community. On the other hand, ‘isolated’ SSEs can be effectively quarantined as only a few individuals can transmit the virus from the isolated community to the outside community, therefore lowering further societal infection.