Delta infections produce similar virus levels regardless of vaccination, early analysis suggests

Coronavirus levels in people with the Delta variant may be similar regardless of whether or not they’ve been vaccinated – and it could have implications for infectiousness, early analysis suggests.

Public Health England’s (PHE) said initial findings suggested “levels of virus in those who become infected with Delta having already been vaccinated may be similar to levels found in unvaccinated people.” The Delta variant has become the dominant coronavirus type globally. Latest hospitalization data confirm again that vaccines, while providing high levels of protection, are not 100% effective. Of recent admissions for the virus, 808 (55.1%) were unvaccinated, while 512 (34.9%) had received both doses of a vaccine, said PHE.

Vaccines have been shown to provide good protection against severe disease and death from Delta, especially with two doses, but there is less data on whether vaccinated people can still transmit it to others.

The Delta variant, which originated in India, remains dominant in the UK and accounts for approximately 99% of cases, said PHE in its latest variant briefing. PHE has currently identified four variants of concern (VOCs) and 10 variants under investigation (VUIs).

“There is preliminary laboratory evidence to suggest that vaccination and previous infection may be less effective at preventing infection with VUI-21JUL-01,” said PHE. “However, this data is very limited and more research is required. There is no evidence to suggest that VUI-21JUL-01 is more transmissible than the dominant Delta variant.”



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Jennifer is a CEO, executive producer, host of "Politics in skirts," and a former correspondent for Fox News. She is a lawyer, journalist, and TV and radio host.

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