Table of Contents COVID-19 Variants Further Strain Public Health Agencies A health worker handles a COVID-19 test kit in a drive-thru testing center in Lancashire, England, as part of a testing blitz to find cases of the South Africa coronavirus variant. In the United States, vaccinations are ramping up, but states face new challenges with the appearance of more transmissible COVID-19 variants. Peter Byrbe Press Associated via The Associated Press Even as President Joe Biden plans to federalize the pandemic response, new COVID-19 variants will force state and local pub...