A 25-year-old Reno man with mild COVID-19 symptoms initially was found to have the virus in April. He recovered and tested negative twice, and then tested positive again in June. He was much sicker the second time, with pneumonia that required hospitalisation and oxygen treatment.

US: Nevada man infected twice with COVID-19, HK researchers confirmed similar case

World's first case of Coronavirus reinfection has been found in Hong Kong. A 33-year-old man had a different strain of the Coronavirus than the one he was previously infected with in March.

COVID-19 reinfection: Hong Kong reports world's first 'proven' case

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US: Nevada man infected twice with COVID-19, HK researchers confirmed similar case

COVID-19 reinfection: Hong Kong reports world's first 'proven' case