Duda, who has recovered from the virus himself, told reporters that a COVID-19 survivor “will not contract the coronavirus himself a second time while he has antibodies, and will not infect anyone else.”
He added that those who gave gotten well after suffering COVID-19 could provide help “in places where potentially more people are at risk."
The Polish president tested positive for the coronavirus in October. He recovered after suffering only mild symptoms.
Duda then donated plasma to help coronavirus patients and encouraged all COVID-19 survivors to follow in his footsteps.
Poland on Tuesday reported 9,105 new coronavirus infections and 449 more deaths, bringing its total number of cases to 999,924 and fatalities to 17,599.
Meanwhile, 597,589 people have now recovered from COVID-19 throughout the country, including 20,075 over the last 24 hours, the health ministry said.