. >> that's josh haskell reporting. a possible safety, you has stopped testing of a covid-19 antibody therapy. the eli lilly study has been put on hold over an unspecified concern. eli lilly is working on a therapy similar to a treatment president trump received after he was skgs diagnosed. a temporary halt by johnson & johnson following an unexplained illness of one of the participants in the study. now abc 7 news anchor dion lim has a look at a bay area connection in the race for a covid treatment. >> reporter: researchers at stanford were just days away from joining the trial of a promising covid vaccine candidate. then came word that manufacturer johnson & johnson is pausing the study after a participant became sick after an unexplained illness. now comes the challenge of figuring out why. >> they'll need to do follow-up, lab tests, alcoholism clinical . we just don't know what the issue is. >> reporter: an infectious disease ex personality at stanford. although she's not directing the trial, she says the interrupti