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Doctor on spread of highly contagious COVID-19 variant in U.S.
U.S. monitoring spread of highly contagious COVID-19 variant as vaccination rate slows
Tufts doctor on US spread of contagious COVID-19 strain
Highly contagious delta variant now dominant Covid strain in the U.S.
Latest COVID variants BA.4 and BA.5 are highly contagious, doctor says
US health experts brace for highly contagious variant of COVID-19
Omicron is ‘an astronomically contagious disease,’ medical expert says
6 things to know about the highly contagious coronavirus Delta variant | Yahoo News Explains
U.S. hits record number of new COVID-19 infections Monday as Omicron variant spreads
Doctor on COVID-19 variants and booster shots as virus spreads in under-vaccinated areas
Doctor on COVID-19 variants' potential spread, impact on vaccines
Is there a new highly contagious COVID variant in the US?