(Photo: AP-Yonhap News)
The top infectious disease expert in the United States says there is reason to be concerned about the impact of some coronavirus mutations on vaccines, but that scientists have plenty of room for modifications to maintain their effectiveness.
Dr. Anthony Fauci said Wednesday that there is particular concern about the so-called South African variant, because lab tests have shown it can diminish the protective power of the vaccines approved to date.
However, Fauci stressed the level of protection provided was still well within what he called the "cushion" of vaccine effectiveness.
He added that the government was working with pharmaceutical companies on potential "booster" shots to combat the variants.
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