Having SARS-CoV-2 once confers much greater immunity than Pfizer vaccine

“The natural immune protection that develops after a SARS-CoV-2 infection offers considerably more of a shield against the Delta variant of the pandemic coronavirus than two doses of the Pfizer-BioNTech vaccine, according to a large Israeli study that some scientists wish came with a “Don’t try this at home” label....More...

Vaccine waning studies show large declines in efficacy againt infection for Covid-19 vaccines

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Turkey: 4th vaccination offered to health workers

Turkey’s Health Ministry has announced that health workers and priority groups are now eligible to receive a fourth dose of the COVID-19 vaccine as part of the country’s efforts to combat the resurgence of the disease....More...

mRNA vaccine booster dose antibodies – quantity not quality

“These results suggest that boosting vaccinated individuals with currently available mRNA vaccines would produce a quantitative increase in plasma neutralizing activity but not the qualitative advantage against variants obtained by vaccinating convalescent individuals.”...More...

Israel: 5,770 vaccine breakthrough infections, 495 hospitalized, 123 died

The Israeli Health Ministry reported Thursday the efficacy of Pfizer’s coronavirus vaccine in preventing infection has dropped to 39% but the effectiveness in preventing severe illness still remains relatively high....More...

Pfizer Chief Scientific Officer: after six months there likely is the risk of coronavirus reinfection as antibodies wane

Pfizer Chief Scientific Officer Mikael Dolsten said the recently reported dip in the vaccine’s effectiveness in Israel was mostly due to infections in people who had been vaccinated in January or February....More...

Israel: Hebrew University study finds Pfizer vaccine just 70% effective against Delta variant

In a separate report to the one we mentioned earlier where the efficacy of the Pfizer vaccine was estimated to be just 64%, a new study from the Hebrew University reports that the Pfizer vaccine is 70 percent effective against the new ultra-contagious Delta variant....More...