The Delta Covid-19 variant first detected in India now accounts for 83.2% of Covid-19 cases in the US, and 90% of cases in Missouri, according to estimates updated Tuesday by the US Centers for Disease Control and Prevention.
CDC Director Dr. Rochelle Walensky told a Senate Committee on Health, Education, Labor, and Pensions hearing about the 83% projection earlier on Tuesday. “This is a dramatic increase, up from 50% for the week of July 3rd,” she said.
The Delta variant, also known as B.1.617.2, now accounts for nearly 90% of cases in Missouri, the CDC says.
The B.1.1.7 or Alpha variant first detected in the UK accounted for 8.3% of cases in the US as of July 17, the CDC estimates. The P.1 or Gamma variant first seen in Brazil accounts for 3.3% of cases. Other variants account for very few cases, the CDC estimates show.
The CDC used data collected in the two weeks ending in July 17. It creates estimates by sequencing samples taken from some people and modeling what that might mean for the whole country.