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Maybe you didn't get the flu. Flu like symptoms are very common in a huge variety of ailments. Vaccinations are very effective protective measures. Just not at

• blattimwind 7y ago
  Vaccinations are very much like a blacklist (or signature-based anti-virus). They are generally highly effective against what's on the list, but they don't interact with stuff that isn't on it. Of course, some vaccines work better than others. Additionally, most vaccinations, and all the common ones, are very safe. So even though e.g. the flu shot is not 100 % effective in preventing the flu², it is practically 100 % safe, which means your expected outcome can only improve by taking it. ² I believe the actual numbers are something like 80 % for the flu: people vaccinated against flu strain X only contract it at 20 % the rate of unvaccinated people, or numbers to that effect