Vaccinated People Easily Transmit COVID-19 Delta Variant in Households: UK Study

Graphic by Think for Yourself; feel free to share!

by Jack Phillips, Epoch Times, Oct. 28, 2021

The Delta COVID-19 variant can easily transmit from vaccinated people to their household members, said a recent UK study, although its researchers concluded that vaccinations and boosters are the way forward.

A year-long study from the Imperial College London published in The Lancet on Thursday found that the Delta variant is still highly transmissible within a vaccinated population.

“By carrying out repeated and frequent sampling from contacts of COVID-19 cases, we found that vaccinated people can contract and pass on infection within households, including to vaccinated household members,” Dr. Anika Singanayagam, co-lead author of the study, said in a statement.

The findings, Singanayagam added, provide some insight into why the Delta variant is “continuing to cause high COVID-19 case numbers … even in countries with high vaccination rates.”

An analysis found that the viral load declined most rapidly for those who were vaccinated with the Delta variant compared with those who are unvaccinated, according to the researchers.

But the peak levels of the CCP (Chinese Communist Party) virus [SARS-CoV2] which causes COVID-19, in vaccinated people were similar to levels in unvaccinated people, they found, adding that it might be the reason why the Delta variant can spread despite vaccination.

Because the Delta variant can spread easily among vaccinated people, another researcher involved in the study, Dr. Ajit Lalvani, argued it is necessary for people to get the vaccine or boosters to reduce severe COVID-19 symptoms.

“We found that susceptibility to infection increased already within a few months after the second vaccine dose … so those offered a booster should get it promptly,” Lalvani said.

Their study, which surveyed 621 participants, found that of 205 household contacts of people who had the Delta infection, about 38 percent of household contacts who were not vaccinated tested positive, compared with 25 percent who tested positive among vaccinated household contacts.

Immunity from full vaccination also dropped in as little as three months, their research also found. They didn’t say whether it should inform the UK’s booster policy.

However, amid the push to get large swaths of the population vaccinated, some immunologists and doctors have argued that natural immunity needs more research and should be factored into policy decision-making.

Steve Templeton, an immunologist with Indiana University’s school of medicine, wrote that “the key to ending the pandemic has always been the immune system.”

“The fact that so many have recovered from infection and that robust, durable, and protective immunity in those individuals has been unequivocally proven should be considered a good thing,” he said in an article dated Oct. 22.

He added that “there appears to be a drive to cancel the term ‘natural immunity,’ a pretense that the vaccinated need fear the unvaccinated, and an unwillingness to treat the public as adults that can handle nuanced information and make decisions regarding their health.”

This is another version of the same story:

Vaccinated People Also Spread the Delta Variant, Yearlong Study Shows

by Suzi Ring,, Oct. 28, 2021

  •  Study found similar peak viral load with or without shots
  •  Immunized household contacts have a 25% chance of infection

People inoculated against Covid-19 are just as likely to spread the delta variant of the virus to contacts in their household as those who haven’t had shots, according to new research.

In a yearlong study of 621 people in the U.K. with mild Covid-19, scientists found that their peak viral load was similar regardless of vaccination status, according to a paper published Thursday in The Lancet Infectious Diseases medical journal.

The analysis also found that 25% of vaccinated household contacts still contracted the disease from an index case, while 38% of those who hadn’t had shots became infected.

The results go some way toward explaining why the delta variant is so infectious even in nations with successful vaccine rollouts, and why the unvaccinated can’t assume they are protected because others have had shots.

Those who were inoculated cleared the virus more quickly and had milder cases, while unvaccinated household members were more likely to suffer from severe disease and hospitalization.

“Our findings show that vaccination alone is not enough to prevent people from being infected with the delta variant and spreading it in household settings,” said Ajit Lalvani, a professor of infectious diseases at Imperial College London who co-led the study.

“The ongoing transmission we are seeing between vaccinated people makes it essential for unvaccinated people to get vaccinated to protect themselves.”

Vaccination was found to reduce household transmission of the alpha variant — first discovered in the U.K. in late 2020 — by between 40% and 50%, and infected vaccinated individuals had a lower viral load in the upper respiratory tract than those who hadn’t had shots. The delta variant has been the dominant strain globally for some time, however.

The research also showed that immunity from full vaccination waned in as little as three months. The authors said there wasn’t enough data to advise on whether this should lead to a change in the U.K.’s booster policy, where third doses are currently being offered to older and more vulnerable people six months after their second shot.

Six months was an arbitrary time period chosen following early data from Israel on the effectiveness of boosters, but there is no reason to believe they would be less effective if given earlier, said Neil Ferguson, an epidemiologist at Imperial College London and investigator on the study, at a press briefing Thursday. 

The booster program could help halt the virus, as extra shots or repeated infections tend to lead to longer immunological memory, potentially protecting people for up to a year, Lalvani said. More data are needed to confirm this, he said.

The authors didn’t analyze infections based on the type of vaccines people had received. Maria Zambon, head of influenza and respiratory virology at the U.K. Health Security Agency, noted that there are still more than 300 vaccines in development, and said it’s possible that future generations of shots may be better at preventing transmission.

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Natural Immunity Offers 13x Better Protection Against Delta Variant Than Pfizer Vaccine: Study

by Spencer Brown,, Aug 31, 2021

A recently released study — pending peer review — from researchers in Israel found that individuals who developed natural immunity after contracting the Wuhan coronavirus are better protected against the Delta variant than those who only have immunity induced by the Pfizer mRNA vaccine.

The findings reported in this massive study directly contradict findings from the CDC released earlier in August and used to urge those who already had COVID to get vaccinated. 

Spurred by reports that vaccine-induced immunity wanes over time, researchers in Israel compared three groups of people — unvaccinated individuals who had COVID, individuals vaccinated with the two-dose Pfizer vaccine, and individuals who had COVID and received one dose of the Pfizer vaccine — to see who is best protected against the Delta variant.

1-According to the largest study done comparing the effectiveness of natural immunity to fully-vaccinated, natural immunity wins hands down.

2-Largest study finds dramatically more Covid-19 hospitalizations among fully-vaccinated compared to previously-infected.

The study looked for three outcomes among these populations to measure the efficacy of natural immunity and vaccination: Wuhan coronavirus infection, symptomatic disease, and infection-related hospitalization or death . . .

Hypothesizing that “the more extensive immune response to the SARS-CoV-2 proteins than that generated by the anti-spike protein immune activation conferred by the vaccine” offers better protection against the Wuhan coronavirus, the researchers conclude that “natural immunity confers longer-lasting and stronger protection against infection, symptomatic disease and hospitalization caused by the Delta variant of SARS-COV-2, compared to the… two-dose vaccine-induced immunity.”

[full article at this link]

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