First, how do you know you had the flu? There are more than 100 viruses that can cause “colds and flu” symptoms — though a bad flu is worse than most of them. Doctors often describe it as “high fever, aches and the feeling that you’ve been hit by a truck.” The country is having an early flu season, plus a big wave of norovirus (sometimes called “stomach flu” or “winter vomiting flu”), plus its worst whooping cough outbreak in 50 years, plus the usual spate of winter colds. Unless a doctor took a nasal swab, you can’t be sure that what you had was flu — and unless it was sent on to a top state laboratory or to the Centers for Disease Control and Prevention lab for sequencing (which is not routine), even your doctor wouldn’t be able to say for sure exactly which flu virus it was.
Second, even if you had the flu, you presumably had only one strain, which you now have antibodies against. There are at least four strains circulating this year: H3N2, H1N1, and two different B strains. The flu shot contains vaccines against three of them (it only has one of the B’s). By next year, some flu shots will have four vaccines. So a shot would still offer protection against flus you have not had. I suppose your chances of getting flu twice in one season aren’t huge — but some people just get unlucky. And if you have any reason to particularly fear flu, like a depressed immune system, serious obesity or diabetes, or if you are pregnant, you should definitely talk to a medical professional about this.
Well: Ask Well: Do I Need a Flu Shot if I've Had the Flu?
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Well: Ask Well: Do I Need a Flu Shot if I've Had the Flu?
