In any other circumstance, it would have been a two-dose vaccine,” said Barry Bloom, a research professor of public health and former dean of Harvard T.H. Chan School of Public Health.
Scientists scramble on COVID-19 vaccine dosing; challenge remains for drugmakers
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Dr. Bloom said vaccine makers use the cell lines because they act as a factory that can grow massive quantities of the adenovirus vector.
Catholics urged by U.S. church leadership to avoid Johnson & Johnson COVID-19 vaccine
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