AdvertisementU.S. Is In A Race Between Vaccines And Variants, Says Public Health ExpertMarch 28, 2021Pien HuangfacebookEmailA nurse administers a shot at a COVID-19 mass vaccination site at Martinsville speedway in Ridgeway, Va., on March 12. Ashish Jha, a public health policy researcher, noted Sunday that "despite phenomenal vaccination rates, variants pulled ahead this week." (AFP via Getty Images)