CDC Director Dr. Rochelle Walensky told CNN on Friday that the COVID vaccine cannot prevent the transmission of the disease.

Dr. Rochelle Walensky: Our vaccines are working exceptionally well. They continue to work well for Delta in regard to severe illness and death being prevented. But what they can’t do anymore is prevent transmission.

Earlier, Public Health England said on August 6 that of confirmed Delta cases that had ended up hospitalized since July 19, 55% were unvaccinated, while 35% had received two doses of a COVID-19 vaccine. The data also means that symptomatic Coronavirus spreads heavily among the vaccinated.

Besides, Covid-19 vaccines appeared to be less effective against the delta variant among people in a Colorado county hit early by the more infectious strain, according to a CDC study released Friday. Other studies also concluded that vaccinated people are more vulnerable to the delta strain and may carry as much virus as unvaccinated people.

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