The man had been infected earlier this year in March and got reinfected in August, the study said

According to the pre-print study, the man's second case of COVID-19 occurred 142 days after the first bout
The 33-year-old had first tested positive for the virus on March 26

He experienced a cough, sore throat, fever, and headache

During the second infection, the man tested positive during entry screening at the Hong Kong airport on August 15

He remained asymptomatic this time
The study indicates that SARS-CoV-2 may persist in humans in spite of acquired immunity, much like the coronaviruses causing common cold, the researchers noted
Dr. Kelvin Kai-Wang To of the University of Hong Kong - "The finding does not mean taking vaccines will be useless"

"Immunity induced by vaccination can be different from those induced by natural infection"
Researchers said that even people who have been infected should get vaccinated whenever a vaccine becomes available

They added, "Patients with previous COVID-19 infection should also comply with epidemiological control measures such as universal masking and social distancing"
Maria Van Kerkhove—WHO's technical lead for coronavirus response —said, "What I think is really important is that we put this into context"

She said, "There's been more than 24 million cases reported to date

And we need to look at something like this on a population level"
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