KGO ABC World News Tonight With David Muir May 20, 2020 00:34:00
That, and the race for a vaccine tonight. >> reporter: tonight, an encouraging turn in the battle against the pandemic. after fears that virus patients in south korea had gotten it a second time, the south korean cdc thinks it's likely that people cannot be infected twice. but that conclusion is still preliminary. and they don't know how long that immunity lasts. those scientists pointing to those relapsing cases, now saying they were actually due to testing failures. >> these results are very encouraging and should be very reassuring to the public. that once you get infected with covid-19, it...
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