On Monday August 24th, researchers in Hong Kong announced they had discovered a 33 year old man who had contracted COVID-19 a second time after recovering from a prior infection 4 months earlier. This represents the first confirmed case  of re-infection of the SARS COV-2 virus. The Hong Kong man’s second infection is completely asymptomatic, but it still raises concerns about  the effectiveness  and duration of natural immunity to the virus. Dr. Jeff Pothof is the UW Health Chief Quality Officer.  He joined Monday Buzz host Brian Standing on Monday, August 31.