April 19, 2024

Pfizer Effectiveness Plummets to 42%, Delta Strain Fatality Rate 0% for Those Under 50, Death, Hospitalization, and ICU Admission Higher Among Vaccinated (Mayo Study, Public Health England)


Mayo Clinic and nference conducted a study to evaluate the effectiveness of the Phizer and Moderna covid vaccines. Among Mayo Clinic and their affiliate hospitals (Arizona, Iowa, Minnesota, Florida, Wisconsin), 636,053 individuals tested positive for covid 19. 333,000+ individuals who tested positive for COVID-19 were unvaccinated. 

179,546 of the 645,109 (27.8%) COVID-19 infected individuals in the Mayo Clinic study data met the criteria for inclusion in the study and were vaccinated, meaning not all infected vaccinated individuals were included in the study.

344,450 of the 645,109 infected individuals were unvaccinated (53.3%) and 50% of Americans are fully vaccinated.

With the vaccinated who are under 18 and had at least one dose of the Pfizer or Moderna COVID-19 vaccine between December 1st, 2020 and July 29th, 2021 accounting for nearly one-third of all cases, the efficacy of the vaccines seems to be significantly lower than the 95% projection last year:

The study found that the Phizer mRNA vaccine was 42% effective against the Delta strain

95% of all three study groups (Moderna vaccinated, Pfizer vaccinated, and unvaccinated) consisted of white patients:

Data from Minnesota COVID-19 cases between December 2020 and July 2021 demonstrated the following:

  • 14 days after second dose, vaccinated were most likely to test positive for COVID-19
  • Pfizer vaccinated individuals were more likely to end up hospitalized and in the ICU because of COVID-19 than the unvaccinated
  • There were 4 associated COVID-19 deaths among 25,101 unvaccinated (fatality rate .0016%) and zero among the vaccinated
  • There were zero deaths for vaccinated and unvaccinated individuals in the first 7 days of the study
  • The fatality rate among the unvaccinated (.0016%) was lower than the overall fatality rate of Delta strain (1.2%, 0% for those under 50)

At least 1.1 million Americans have received at least (3) COVID-19 vaccines:

Fatality Rate of Delta 0% for Those Under 50. Vaccinated Fatality Rate 250% Higher Than Unvaccinated

Key statistics and data from Public Health England’s Technical Briefing 20:

  • 300,010 total COVID-19 Delta mutation cases documented
  • 117,115 cases among the vaccinated (39%) and 481 deaths (0.4% fatality rate)
  • 151,054 cases among the unvaccinated (50.4%) and 253 deaths (0.16% fatality rate)
  • 73% of England adults are fully vaccinated and 89% have received at least one dose of a covid-19 vaccine
  • The fatality rate among partially and fully vaccinated individuals was more than twice that of the unvaccinated 
  • The fatality rate of Delta among 311,117 is 0% for those under 50, 2.0% for those over 50, and 0.2% overall
Delta fatality rate among 265,749 cases for those under 50 is 0%

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