Health
Hong Kong researchers report first documented coronavirus reinfection
Hong Kong — Hong Kong people who recovered from COVID-19 were re-infected in the first documented reinfection case four and a half months later, researchers at the University of Hong Kong said Monday.
Studies show that the disease, which killed more than 800,000 people worldwide, could continue to spread to the world’s population, despite collective immunity.
A 33-year-old man cleared COVID-19 in April and was discharged from the hospital, but again tested positive after returning from Spain via the UK on 15 August.
The patient appeared to have been healthy before, the researchers said in a paper, which was accepted by the international medical journal Clinical Infectious Diseases.
He was infected with a different coronavirus strain than he had previously been infected and remained asymptomatic with the second infection.
“This finding doesn’t mean that vaccination is useless,” Dr. Kai Wang To, one of the lead authors of the paper, told Reuters.
“The immunity elicited by vaccination can be different from the immunity elicited by natural infection.” “[We] We need to wait for the results of the vaccine trial to see how effective the vaccine is. “
World Health Organization (WHO) epidemiologist Maria Wankelhove said Monday that she would not have to jump to conclusions in response to the Hong Kong incident.
In mainland China, cases of people who have been discharged from hospitals and tested positive for COVID-19 infection again have been reported. However, in those cases, it was not clear whether the virus was re-infected after a complete recovery, as it happened to a patient in Hong Kong, or if the virus remained in the body from the first infection.
At a news conference in May, Wang Guiqiang, an infectious disease specialist in the COVID-19 therapeutics expert group in China, said the preliminary number of patients who were positively diagnosed again after leaving the hospital was 5% to 15%. I said yes.
One explanation was that the virus was still present in the patient’s lungs but was not detected in samples taken from the upper respiratory tract, he said. Other possible causes are poor test sensitivity and weak immunity, which could result in persistent positive results, he added.
Jeffrey Barrett, expert and consultant for the COVID-19 Genome Project at the Welcome Sanger Institute in the UK, said in an email comment to Reuters that it is very difficult to make strong inferences from a single observation. It was
“Given the number of global infections to date, it’s not so surprising to see one reinfection, even if it’s a very rare case,” he said. (This story modifies “will” in paragraph 2 to “may”)
(Report by Farah Master in Hong Kong, Roxanne Liu in Beijing, Kate Kelland in London, edited by Alex Richardson)
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