By Lauran Neergaard AP Medical Writer The top U.S. infectious disease expert said AstraZeneca's suspension of final testing of its COVID-19 vaccine candidate shows 'one of the safety valves' built into the studies to spot any potential problems. 'It's unfortunate that it happened and hopefully they'll be able to proceed along with the remainder of the trial. But you don't know — they need to investigate it further,' Dr. Anthony Fauci, infectious diseases chief at the National Institutes of Health, told 'CBS This Morning' on Wednesday. Late Tuesday, AstraZeneca announced its final-stage studies are on temporary hold while the company […]

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