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Joseph Prezioso/AFP via Getty Images hide caption toggle caption Joseph Prezioso/AFP via Getty Images Elvin Toro, 26, a former army medic, organizes his syringes before giving out the next dose of a COVID-19 vaccine to a local in Central Falls, R.I., on Saturday. Joseph Prezioso/AFP via Getty Images There s evidence of at least seven U.S. variants of the coronavirus, while another that emerged from the U.K. is poised to become the dominant strain here by the end of March. One adviser from the Food and Drug Administration tells NPR there s a tipping point to watch for: when a fully vaccinated person winds up hospitalized with a coronavirus variant. ....