A 33-year-old man living in Hong Kong had Covid-19 twice this year, according to preliminary research. He had symptoms the first time around, but no obvious symptoms the second time, the team at the University of Hong Kong reports.
A 33-year-old man living in Hong Kong had Covid-19 twice this year, according to preliminary research.
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.
Woman tests positive for Covid-19 twice. Hear what she has to say. 04:03Read More"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.
How antibodies protect us from viruses 01:37Dr. Paul Offit, director of the Vaccine Education Center and professor of pediatrics at Children's Hospital of Philadephia, said it was"great news" that the man in the new study had no symptoms the second time he was infected."That's all you want to see," said Offit, who was not involved in the study.He told CNN that this is a good indicator that a Covid-19 vaccine will do something similar.
"Second infection was asymptomatic. While immunity was not enough to block reinfection, it protected the person from disease," Iwasaki tweeted."Patient had no detectable antibody at the time of reinfection but developed detectable antibody after reinfection. This is encouraging."She added that since reinfection can occur, herd immunity by natural infection is unlikely to eliminate the novel coronavirus.
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