England says Delta infections produce similar virus levels regardless of vaccine status
The findings chime with those from the U.S. Centers for Disease Control and Prevention, which last week raised concerns that vaccinated people infected with Delta could, unlike with other variants, readily transmit it.The highly infectious Delta variant has become the dominant coronavirus type globally, sustaining a pandemic that has already killed more than 4.4 million people, including over 130,000 in Britain.
"Some initial findings ... indicate that levels of virus in those who become infected with Delta having already been vaccinated may be similar to levels found in unvaccinated people," PHE said in a statement. PHE said that of confirmed Delta cases that had ended up hospitalised since July 19, 55.1% were unvaccinated, while 34.9% had received two doses of a COVID-19 vaccine.
Separately, PHE said another variant, known as B.1.621, first detected in Colombia, had shown signs of evading the immune response triggered by either COVID-19 vaccines or previous infection.
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