Vaccine Effectiveness Dropped After Delta Became Dominant: US Health Body

The effectiveness of Covid-19 vaccines among front-line workers declined to 66% after the delta variant became dominant, compared with 91% before it arose, according to a report from the U.S. Centers...

from NDTV News - Topstories https://ift.tt/2Wn71Se
https://ift.tt/eA8V8J