evidence: - MYTH: You can catch the flu from the vaccine. The flu shot is made from an inactivated virus that can't transmit infection. So, people who get sick after receiving a flu vaccination were going to get sick anyway. It takes a week or two to get protection from the vaccine. But people assume that because they got sick after getting the vaccine, the flu shot caused their illness. [...] - MYTH: Getting the flu vaccination is all you need to do to protect yourself from the flu.