Bij de griepprik is het 'ingewikkeld'.
2015
Getting a flu shot every year? More may not be better
"Findings that suggest the science is more complicated than initially believed could lead people to assume annual flu shots are detrimental to their health. That’s not the message researchers such as Belongia want to convey."
2019
Repeated vaccination against matched H3N2 influenza virus gives less protection than single vaccination in ferrets
"Ferrets that received either vaccine regimen were protected against influenza disease and infection relative to naive unvaccinated ferrets, but the repeat vaccination group shed more virus, especially at the peak of virus shedding 2 days post infection and regained weight more slowly than those in the CS group."
2021
Decline in Seasonal Influenza Vaccine Effectiveness With Vaccination Program Maturation: A Systematic Review and Meta-analysis
"We included 72 articles from 11 931 citations. Across the 3 categorizations of PM, a lower pooled VE against all influenza for all patients was observed with PM. Substantially higher reductions were observed in older adults (?65 years). We observed similar results for A(H1N1)pdm09, A(H3N2), and influenza B."