Among people infected by the Delta variant of the coronavirus, fully vaccinated people with "breakthrough" infections may be just as likely as unvaccinated people to spread the virus to others, new research suggests.

In one Wisconsin county, after Delta became predominant, researchers analyzed viral loads on nose-and-throat swab samples obtained when patients were first diagnosed.

They found similar viral loads in vaccinated and unvaccinated patients, with levels often high enough to allow shedding of infectious virus.

"A key assumption" underlying current regulations aimed at slowing COVID-19 transmission "is that those who are vaccinated are at very low risk of spreading the virus to others," said study coauthor Katarina Grande of Public Health Madison & Dane County in Madison, Wisconsin.

The findings, however, indicate "that vaccinated people should take steps to prevent the spread of the COVID-19 virus to others," she added.

In a separate study from Singapore, researchers found that while Delta viral loads were similar in vaccinated and unvaccinated patients, the viral loads decreased faster in the vaccinated group.

  The Lambda variant of the coronavirus, first identified in Peru and now spreading in South America, is highly infectious and more resistant to vaccines than the original version of the virus the emerged from Wuhan, China, Japanese researchers have found.

  Among fully vaccinated people who never had COVID-19, getting a third dose of an mRNA vaccine from Pfizer/BioNTech or Moderna would likely increase levels of antibodies, but not antibodies that are better able to neutralize new virus variants, Rockefeller University researchers reported on Thursday on bioRxiv https://bit.ly/3fnbk6Y ahead of peer review.

"Efforts to promote COVID-19 vaccine uptake among childcare providers take on added significance when considering the emergence of the more transmissible Delta variant," the authors said.

Among people infected by the Delta variant of the coronavirus, fully vaccinated people with "breakthrough" infections may be just as likely as unvaccinated people to spread the virus to others, new research suggests.

In one Wisconsin county, after Delta became predominant, researchers analyzed viral loads on nose-and-throat swab samples obtained when patients were first diagnosed.

Lindsey Graham revealed on Monday he tested positive for COVID-19 after being fully vaccinated against the virus.

On Monday, the hypercontagious Delta variant finally did what Joe Biden couldn’t: convinced 70 percent of U.S.

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