Only once in the past ten years was a flu shot at least 50% effective–and that is according to CDC, which has a history of making vaccines appear more effective than they are
Only once in the past ten years was a flu shot at least 50% effective–and that is according to CDC, which has a history of making vaccines appear more effective than they are
Non-CDC analyses have concluded that in some years the shot has negative efficacy: those vaccinated are more likely to come down with flu than the unvaccinated
