Researchers say once you’ve had coronavirus, your immunity may last for a long time. KDKA’s Dr. Maria Simbra has more. Coronaviruscoronavirus immunityCOVID-19COVID19Dr. Maria SimbraHintsimmune systemIMMUNITYinfectionKDKA-TV News EveningLocal TVLonglastingresearchvideoVITAMINvlogYouTube