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Can someone get the coronavirus twice?

Even if people can get reinfected, the World Health Organization says it likely wouldn’t happen regularly.

Can I get the coronavirus twice?

It seems possible, though how often it happens isn’t known.

Researchers in Hong Kong recently reported evidence of a person who got the coronavirus a second time, months after an initial infection.

RELATED: Scientists say Hong Kong man is first confirmed case of coronavirus reinfection

The finding has not yet been published in a journal. But scientists said the 33-year-old man had mild symptoms the first time and none the second time, suggesting his immune system may have provided some protection against serious illness even if it could not prevent a reinfection. His more recent infection was detected through screening and testing at the Hong Kong airport, and researchers said genetic tests revealed different strains of the virus.

Several other possible cases have been reported, including a U.S. man who was sicker the second time than the first.

Even if people can get reinfected, the World Health Organization says it likely wouldn't happen regularly.

RELATED: Nevada man may be first documented COVID-19 reinfection case in US

Health experts generally believe people who had COVID-19 will have some immunity against a repeat infection. But they don’t know how much protection, or how long it would last.

This is important because if immunity wears off, it could pose a challenge for vaccines. Some experts say booster shots may be needed.

It's also unclear whether reinfected people would be able to spread the virus to others. That's another reason scientists say people should continue to wear masks, social distance and practice good hygiene.

For most people, the new coronavirus causes mild or moderate symptoms. For some, especially older adults and people with existing health problems, it can cause more severe illness, including pneumonia and death.

The United States has more than 6.1 million confirmed cases of COVID-19, according to statistics from Johns Hopkins University.

Just after 4 a.m. EDT Thursday, the U.S. had more than 185,000 deaths from the virus. Worldwide, there are more than 26 million confirmed cases with more than 863,000 deaths.

RELATED: US coronavirus cases surpass 6 million