. >> reporter: jennifer roach and her colleagues were apomong the first to get a shot they hope will be a game changer. >> the benefit of getting the shot and not getting covid versus not getting the shot and getting covid is extreme. >> reporter: as it turns out, john muir was able to vaccinate more than 600 of the front line health care workers on wednesday and they're finding out each vile of the pfizer vaccine contains more doses than expected. >> when they are reconstituting the viles, they are finaling an extra dose in them that's a perfectly good dose so it's a great thing, unexpectedly, everyone that got these shipments will get another dose than expected. >> reporter: given the federal health emergency, the drug agency is advising it is acceptable to use the extra dose from one vile. but not pull the liquid from multiple viles. jennifer roach told us despite the mild side effects, the benefit of getting the vaccine far out weighs the risk of ending up in a covid unit like hers. >> you might have a little soreness, a little tiredness but getting covid is a completely differen

. >> reporter: a nurse in the covid unit jennifer roach and her colleagues were among the first to get a shot they hope will be a game changer. >> the benefit of getting the shot and not getting covid versus not getting the shot and getting covid is extreme. >> reporter: as it turns out, john muhr were able to vaccinate 600 workers on wednesday and they are finaling out, each vile of the pfizer vaccine contains more doses than expected. >> when they are reconstituting the viles, they are finding an extra dose in them and that's a perfectly good dose so it's a great thing unexpectedly, everyone that got this shipment of this vaccine will get another dose than expected. >> reporter: given the public health emergency, the federal dreg administration is advising hospitals and pharmacies that it is acceptable to use the extra dose from one vile but not pull the liquid from multiple viles. despite the mild side effects, the benefit far outweighs the risk of ending up in a covid unit like hers. >> you might have a little soreness and tiredness but getting covid is a completely different ball