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Test monkeys infected with the novel coronavirus responsible for the COVID-19 pandemic were protected from reinfection for up to 28 days later, according to a Chinese study published in the journal Science.    

Scientists from Peking Union Medical College infected six rhesus macaques in their trachea with a dose of the SARS-CoV-2 virus. They developed mild to moderate symptoms, and took about two weeks to recover.  

Twenty-eight days after the first infection, four of the six monkeys received another dose of virus, but this time, despite a brief rise in temperature, they showed no sign of reinfection, the study authors wrote.

While the monkeys displayed initial immunity, it is not clear how long such immunity will last in humans – it will be necessary to wait for months, or even years, to know if the millions of people infected at the start of the pandemic are protected from reinfection. 

Al Jazeera News

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