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Update October 30, 2021: a UK study finds that “the domestic secondary attack rate for delta infection, regardless of vaccination status, was 26%” and “peak viral load did not differ from vaccination status” .

  • Update October 29, 2021: unlike natural immunity, Israeli data confirm that the protection of the Pfizer vaccine has vanished in a few months in all age groups.
  • Update October 13, 2021: UK data finds that vaccines are “highly effective”, but effectiveness declines after just 3-4 months.

Fully vaccinated individuals had received Pfizer.

Update October 8, 2021: A study of healthcare workers in Vietnam found that vaccinated people infected with Delta Covid-19 carry “unusually high viral loads” in their nostrils that are “251 times higher” than normal.

healthcare-workers-banner-1066x600-1725578The study said that during a time when vaccinated patients are infected but don’t know it yet, they could be responsible for a greater spread to other vaccinated or unvaccinated. The subjects had been fully vaccinated with the AstraZeneca vaccine.Israel announced that around half of the adults infected with Covid-19 during its outbreak in June 2021 have been fully vaccinated.

According to the Epoch Times, nearly 4,000 fully vaccinated people in Massachusetts tested positive for Covid-19 in June 2021. On April 30, “the CDC reported that approximately 10,626 breakthrough cases have been reported in 46 states and territories.” Revolutionary cases are those in which fully vaccinated people end up infected with Covid-19 again.

Scientists hoped that Covid-19 vaccines would be effective in Covid-19 variants, which are naturally occurring mutations with viruses and have always been expected with Covid-19. However, the effectiveness of the variant vaccine may be limited. CDC and vaccine manufacturers are studying the medical landscape to find out more.

Covid-19 occurring in fully vaccinated people.

epidemiologists-meeting-in-laboratory-290x253-1-9985911Update August 24, 2021: With immunity tests plummeting at five to six months, the CDC is now recommending a third “booster”. In highly vaccinated Israel, recognizing that vaccination probably does not confer protection beyond a few months, the country has reinvented its vaccination passports.

They will only apply to people who have had three doses and will only be valid for a period of six months.Update 10 September 2021: An analysis of data in Israel, which has one of the highest levels of Covid-19 vaccination in the world, showed that nearly 60% of those hospitalized for Covid were fully vaccinated.

“This is a very clear warning sign for the rest of the world,” said Ran Balicer, CIO of Clalit Health Services, Israel’s largest health organization. “If it can happen here, it can probably happen anywhere.”

Pfizer vaccine is administered in Israel.

Update October 4, 2021: A study by university scientists and NIH in the United States finds that antibodies from the Pfizer vaccine disappear after about 7 months in many patients.
Summary by country

what-is-epidemiology-and-what-does-an-epidemiologist-do-1-5702853Austria: Some AstraZeneca “lots” banned. Brazil: Several Brazilian states suspended the use of AstraZeneca’s Covid-19 vaccine for pregnant women in May 2021 after a pregnant woman died after being vaccinated.

The decisions follow the recommendation of the country’s National Health Surveillance Agency, which recommended the “immediate discontinuation” of the AstraZeneca Covid-19 vaccine for pregnant women after the results of the adverse event monitoring of the vaccine in the country.

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