Category: Revaccination

WHO: 500,000 deaths from Covid in Europe this winter

“The current pace of transmission across the 53 countries of the European Region is of grave concern,” said regional WHO head Hans Kluge.  More...

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

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

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Europe suddenly ablaze with Covid – it could be the biggest wave yet

We predicted here and here that we would see a fresh Covid wave after October 19th, but even we didn’t expect Europe to ignite into a raging inferno within a couple of days.  More...

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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

 

   More...

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