The two shots, based on same technology, have come under suspicion of causing very rare but serious blood clots in a handful of cases among millions vaccinated
European drug regulator says authorization for the single-dose vaccine could be granted by mid-March if its 'efficacy, safety and quality are sufficiently comprehensive and robust'
Johnson & Johnson's easy to administer, easy to store COVID shot likely to be 3rd vaccine to win US approval with 72% effectivity, dropping to 57% against more contagious mutuation
FDA says Oxford vaccine testing can resume; other nations already determined participant's illness not related; J&J also finds no link to subject's illness in its trial
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