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Study: COVID-19 and Flu Vaccine Co-Administration Leads to Higher Risk of Stroke

A pre-print study posted on 15 October 2023 titled “Ischemic Stroke after Bivalent COVID-19 Vaccination: A Self-Controlled Case Series Study” by S. Xu et al of Kaiser Permanente Southern California has found that those who are <65 years old, COVID-19-vaccinated and flu-vaccinated are at increased risk of a getting a stroke.


The study period was from 1 September 2022 to 31 March 2023. The risk intervals are for 1–21 days and 1–42 days after administration of the COVID-19 vaccines for individuals aged ≥12 years for Pfizer and aged ≥18 years for Moderna.


Overall, there are over four thousand ischemic stroke events in the sample. More were aged ≥65 years with up to three times more than those aged <65 years, depending on the subgroup and interval.


According to the analysis, there is no significantly elevated risk of stroke for 1–21 days overall or any of the subgroups. However, for 1–42 days, there is an elevated risk for some subgroups aged <65 years. (See Table 2 and Table 4 reproduced below for actual figures.)

  • Pfizer and influenza vaccine co-administration, relative incidence is 2.14 (95% CI, 1.02–4.49).

  • Pfizer and influenza vaccine co-administration and with a history of COVID-19 infection, relative incidence is 3.94 (95% CI, 1.10–14.16).

  • Moderna and influenza vaccine co-administration, relative incidence is 1.33 (95% CI, 0.56–3.18).

  • Moderna and influenza vaccine co-administration and with a history of COVID-19 infection, relative incidence is 2.43 (95% CI, 0.54–10.87).

  • Moderna and no influenza vaccine co-administration but with a history of COVID-19 infection, relative incidence is 2.69 (95% CI, 0.98–7.36).


The sample is arguably not huge and the 95% CI are admittedly wide but one has to wonder what these so-called vaccines are really doing…


Table 2: Ischemic Stroke Events and Relative Incidences in the 42 Days after Pfizer-BioNTech Bivalent COVID-19 Vaccination.
Table 2: Ischemic Stroke Events and Relative Incidences in the 42 Days after Pfizer-BioNTech Bivalent COVID-19 Vaccination.
Table 4: Ischemic Stroke Events and Relative Incidences in the 42 Days after Moderna Bivalent COVID-19 Vaccination.
Table 4: Ischemic Stroke Events and Relative Incidences in the 42 Days after Moderna Bivalent COVID-19 Vaccination.
 

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