WASHINGTON - The government's top infectious disease expert told a House committee on Tuesday he believes "it will be when and not if" there will be a COVID-19 vaccine and that he remains "cautiously optimistic" that some will be ready at the end of the year.Download the FOX 5 DC News App for Local Breaking News and WeatherWith coronavirus cases rising in about half the states and political polarization competing for attention with public health recommendations, Dr.
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