Researchers in Hong Kong are reporting the first confirmed case of a person being reinfected with COVID-19.
They say a 33 year old man first recovered in April from the virus and after returning from Spain this month has tested positive again.
The man was asymptomatic during this second infection.
Researchers say the genetic sequencing showed the virus strains April and august were ‘clearly different’ – which is of concern because they say it suggests that immunity to the coronavirus may last only a few months in some people.
Doctors say this will also have implications for vaccines being developed for the virus.