The 64-year-old actor had kept his hospitalization private until now. He says he was treated with the drug remdesivir.
Gibson has tested negative several times since leaving the hospital and has tested positive for antibodies to the virus.
Gibson is among many public figures in entertainment, sports and other high-profile fields to disclose positive diagnoses of COVID-19, including Tom Hanks and his wife Rita Wilson, Idris Elba and singer P!nk.
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