Serological Survey following SARS-COV-2 Outbreaks at Long Term Care Facilities in Metro Vancouver, British Columbia: Implications for Outbreak Management and Infection Control Policies.

A cross-sectional serological survey was carried out in two long term care facilities that experienced COVID-19 outbreaks in order to evaluate current clinical COVID-19 case definitions. Among individuals with a negative or no previous COVID-19 diagnostic test, myalgias, headache and loss of appetite were associated with serological reactivity. The US CDC probable case definition was also associated with seropositivity. Public health and infection control practitioners should consider these findings for case exclusion in outbreak settings.