Elderly Vaccinated Danes more likely to get Flu A /H3N2 than the unvaccinated/ Eurosurveillance
This may mean the vaccine was of no use due to high rates of mutation. Or it could mean the vaccine-induced antibodies made you more likely to get sick. (I have previously talked about the concept of blocking antibodies, which have occasionally been seen after introduction of a new vaccine, increasing the propensity to get the disease you are ostensibly being protected from. The new vaccine is soon taken off the market.)