Pfizer Vaccine’s ‘Efficacy’ for a Severe Adverse Reaction Is 450%
The vaccinated are 19 times less likely to contract Covid and 4.5 times more likely to report a severe reaction that requires hospitalization
8 of 17411 subjects vaccinated in the Pfizer trial went on to nonetheless test positive in the next two months, while 162 of the 17511 in the control group did so.
Pfizer therefore calculates the vaccine has a “95% efficacy” in warding off a COVID infection. (Ie it is not at all a guarantee that 95% of the vaccinated are now immune. It is simply the observation that in the vaccinated group infection incidence was reduced by 19 times from 0.9% to 0.05%.)
The same trial also reported two grade 3 or higher adverse reactions in the control group, and nine in the vaccinated group. By the same comparative calculation, the vaccine’s “efficacy” when it comes to giving you a severe adverse reaction is 450%. (Incidence rose 4.5 times from 0.01% to 0.05%.)*
A grade 3 reaction is classified as a reaction causing hospitalization, or prolonging existing hospitalization:
“Severe or medically significant but not immediately lifethreatening; hospitalization or prolongation of hospitalization indicated; disabling; limiting self-care ADL”
Grade 4 is life-threatening, and grade 5 is death.
For the record, of the non-vaccinated group 5 ended up in the hospital due to COVID, and 0 of the vaccinated group. However, since 9 from the latter group experienced grade 3 severe reactions and just 2 in the control group that means that when vaccine-related hospitalizations are added, overall there were actually slightly more (28%) hospitalizations in the vaccine group. (0 + 9 compared to 5 + 2.)
These are the short-term hazards. What the long-term hazards are nobody knows for sure this being a completely new type of vaccine. One that is theoretically far safer than the old kind, but that we simply won’t be in the position to know for sure for another 5-10 years.
*More formally you would say not vaccinating has a 78% (1-1/4.5) efficacy in staving off a severe adverse reaction to the vaccine.