COVID-19 REINFECTION: HONG KONG RESEARCHERS REPORT FIRST CASE, BUT MORE STUDY IS NEEDED

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By Jacqueline Howard, CNN 15 hrs ago

A 33-year-old man living in Hong Kong had Covid-19 twice this year, according to preliminary research.

a close up of a hand: HKUMed: Pseudo-colour scanning electron micrograph of SARS-CoV-2 grown in culture from a patient isolate. After 24 hours in culture there are large numbers of orange viral particles on the surface of the cell (blue). Image courtesy of LKS Faculty of Medicine, Department of Electrical and Electronic Engineering (K.Tsia, K.Lee and Q.Lai), and Electron Microscopy Unit, The University of Hong Kong© The University of Hong Kong HKUMed: Pseudo-colour scanning electron micrograph of SARS-CoV-2 grown in culture from a patient isolate. After 24 hours in culture there are large numbers of orange viral particles on the surface of the cell (blue). Image courtesy of LKS Faculty of Medicine, Department of Electrical and Electronic Engineering (K.Tsia, K.Lee and Q.Lai), and Electron Microscopy Unit, The University of Hong Kong

He had symptoms the first time around, but no obvious symptoms the second time, the team at the University of Hong Kong reported Monday.

The pre-print study -- which the University of Hong Kong said has been accepted for publication in the journal Clinical Infectious Diseases -- found that the man's second case of Covid-19 occurred 142 days after the first.

During his first episode of illness, the patient had a cough, sore throat, fever and headache for three days, according to the study. He tested positive for Covid-19 on March 26.

Then during his second episode, the patient was returning to Hong Kong from traveling in Spain via the United Kingdom, and he tested positive during his entry screening at the Hong Kong airport on August 15, the researchers said. The man was hospitalized again but remained asymptomatic.

"The patient got re-infected 4.5 months after the first infection. Therefore, it shows that for this patient, the immunity induced by the first infection is short lasting," Dr. Kelvin Kai-Wang To of the University of Hong Kong, who worked on the study, said in an email to CNN.

a person standing in a body of water with a city in the background: HONG KONG, CHINA - JULY 30: A couple enjoy their moment at a typhoon shelter during sunset in front of Hong Kong skyline on July 30, 2020 in Hong Kong, China. Hong Kong have recorded the highest daily tally of Covid-19 with 149