Last time I had the flu I had a fever and didn’t really notice until I got to the gym and noticed how much weaker I was that day and how cold I felt, my being fit made it not feel that bad unless I exerted myself, but I was definitely still sick and contagious. I also didn’t have my flu shot because I don’t really think the flu is that bad, but you bet your ass I get my tetanus shots when I need to and whatnot

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I also got COVID once and didn’t notice it until they tested me for it at the hospital when I had an unrelated issue, but I was fully vaccinated for COVID at that point so I’d probably say that was because the shot was doing its job

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