Researchers in the US have reported the country’s first confirmed case of coronavirus reinfection.

A 25-year-old man with no known immune disorders or underlying conditions was infected with Covid-19 on two separate occasions, according to a study published in the Lancet Infectious Diseases journal.

While the authors said further research was required, they added the findings indicate previous exposure to the virus may not guarantee total immunity, and that all individuals should comply with control measures.

It is the fifth confirmation of reinfection worldwide, researchers said, with at least four other cases confirmed in Belgium, the Netherlands, Hong Kong, and Ecuador.

The second infection of the patient, who lives in Washoe County, Nevada, was more severe than the first and resulted in hospitalisation with oxygen support.

Researchers from the Nevada State Public Health Laboratory and the University of Nevada, Reno School of Medicine said he tested positive for the virus in April this year, and later tested negative on two separate occasions.

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