Can getting the flu shot cause the flu?

So my husband went to get the flu today. But he was scared telling me that he’s never been sick before and that now he’s worried he’ll catch the flu with the shot he received today. He said he barely gets colds and any other kind of sickness. He thinks maybe if he did get the flu he was a child but that’s about it. He scared me and now i’am thinking what happens if it does cause him the flu or gets him sick with a bad cold.

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