FrogReaver
The most respectful and polite poster ever
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Decline in influenza vaccine effectiveness with time after vaccination, Navarre, Spain, season 2011/12 - PubMed
This study evaluates the influenza vaccine effectiveness (VE) in preventing laboratory-confirmed cases in Navarre, Spain, in the 2011/12 season in which the peak was delayed until week 7 of 2012. We conducted a test-negative case–control study. Patients with influenza-like illness in hospitals...www.ncbi.nlm.nih.gov
The timeframe was <100 days and the geographical position was unchanged. I.e. same strains prevalent.
The first article states: "Most characterized viruses did not match the vaccine strains." That's contrary to your assertion above. I see no evidence in that article of whether the vaccine was less effective due to fewer antibodies over time or due to other flu strains prevalent in the area.
And another: Waning vaccine protection against influenza A (H3N2) illness in children and older adults during a single season. - PubMed - NCBI
ETA: I have no idea how I quoted an old message initially. Fixed it.
This article also doesn't note whether it's a different strain of influenza A that infected people later in the season than the vaccine was designed to prevent.
Do you have any evidence that actually supports your conclusion. I find the premise fascinating but I've seen nothing in those articles or anywhere else to confirm it.