Category: Pfizer/Biontech

Will the UK’s mass Covid infection experiment pay off?

On the 19th July 2021, Britain’s mass Covid infection experiment began.  More...

Coronaheadsup.com Astrazeneca, B.1.617.2, Children, Coronavirus, Deaths, Delta, Delta-AY.4.2, Elderly, England, Herd Immunity, Hospitalization, Infection, London, Long Covid, Moderna, Northern Ireland, Pfizer/Biontech, Reinfection, Reservoir, Revaccination, Scotland, Superspreader events, Transmission, UK, Vaccine, Vaccine Breakthrough, Vaccine Waning, Wales

UK ONS: Natural infection by Covid provides a similar level of protection to two vaccine doses

UK Office of National Statistics: “Two vaccination doses provided a similar level of protection to previous natural infection during the Delta-dominant period”

Modelled risk ratios of testing positive for COVID-19 by COVID-19 vaccine exposure, when the Delta variant was dominant, UK, 17 May to 14 August 2021

 

  • there was no evidence that the reduction in risk of infection from two doses of either vaccine differed from that of previous natural infection
  • two doses (14 days or more previously) of Pfizer-BioNTech reduced the risk of testing positive by 73% (95% confidence interval: 70% to 76%) in the Delta period, compared with 80% (95% confidence interval: 74% to 85%) in the Alpha period​
  • two doses (14 days or more previously) of Oxford-AstraZeneca reduced the risk of testing positive by 62% (95% confidence interval: 58% to 66%) in the Delta period, compared with 76% (95% confidence interval: 62% to 85%) in the Alpha period
  • the reduction in risk 14 days or more after second dose was significantly higher with Pfizer-BioNTech compared with Oxford-AstraZeneca​
  • the risk reduction from two doses of either vaccine was greater than from one dose (21 days or more previously)

 

UK ONS report:  Coronavirus (COVID-19) Infection Survey Technical Article: Impact of vaccination on testing positive in the UK: October 2021

 

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Coronaheadsup.com Astrazeneca, Coronavirus, Infection, Pfizer/Biontech, Revaccination, Treatment, UK, Vaccine

Israel: 7% of serious Covid cases have had three vaccine shots

Some 7% of Israel’s serious and critical COVID-19 cases were vaccinated with three shots of the coronavirus vaccine, according to data released Friday morning by the Israeli Health Ministry.  More...

Coronaheadsup.com Asia, B.1.617.2, Coronavirus, Delta, Healthcare, Hospitalization, Infection, Israel, Moderna, Pfizer/Biontech, Revaccination, Transmission, Vaccine, Vaccine Breakthrough, Vaccine Waning

Preprint: Breakthrough SARS-CoV-2 infections in 620,000 U.S. Veterans – protection decreased from 92% to 54%

We compared SARS CoV-2 infection by vaccination status from February 1, 2021 to August 13, 2021 in the Veterans Health Administration, covering 2.7% of the U.S.  More...

Coronaheadsup.com America, B.1.617.2, Coronavirus, Delta, Healthcare, Herd Immunity, Hospitalization, Infection, Janssen, Moderna, Pfizer/Biontech, Revaccination, Testing, Transmission, USA, Vaccine, Vaccine Breakthrough, Vaccine Waning

UK ONS: one in sixty people infected with Covid, worst infection rate since January 2021

The prevalence of COVID-19 infections in England increased to around 1 in 60 people in the week ending Oct 9 2021, Britain’s Office for National Statistics said on Friday, reaching its highest level since January 2021.  More...

Coronaheadsup.com Astrazeneca, B.1.617.2, Children, Coronavirus, Delta, England, Herd Immunity, Infection, London, Moderna, Northern Ireland, Pfizer/Biontech, Scotland, Testing, Transmission, UK, Vaccine, Vaccine Breakthrough, Vaccine Waning, Wales