Watch more in iWantv or TFC.tv

MANILA - Sen. Sonny Angara said Saturday he tested positive for the coronavirus disease 2019 (COVID-19) again nearly a month since his recovery, but that nothing was yet sure as doctors were looking at possible remnants of the virus from his earlier infection.

In a statement, Angara said the result came out in a swab test he again took while preparing for his second plasma donation to help in the treatment of coronavirus patients.

"It has been close to one month since I recovered from COVID-19. But while preparing to donate my blood plasma for a second time, my doctors, after the results of the initial antibody test taken before donating, had me take another swab test, which registered positive," Angara said.

His doctors, however, said his wife's negative test showed he may no longer be infectious and that "the latest positive result is probably picking up remnants of the virus."

Angara said he has returned to isolation and that he would participate in Senate duties remotely, with Congress resuming sessions on Monday.

"Nothing is 100% sure at this point so it is best to be prudent and cautious and thus it is best that I not attend Senate sessions in person for the risk posed to others. And we will follow the usual quarantine procedures for myself and members of my household as a precaution," said Angara.

Angara, 47, had announced on April 6 he had recovered from the contagious disease. On April 17, he posted a photo showing he had been reunited with his family.

• LOOK: Angara back with family after recovering from COVID-19

"It was hard being isolated from my family before when I tested positive. I felt so much joy and happiness when I was cleared and was able to kiss and hug them again. Now I'm back in isolation. I am hopeful that soon our lives will return to normal," said the lawmaker.

"I will continue to stay at home for now but I will participate in Senate proceedings through teleconferencing which the Senate may allow starting Monday after an amendment to our Rules. Rest assured that I will continue working from home like many of our countrymen and performing my duties as senator to the best of my ability," he said.