Using the US as an example just because, but it applies all over. Saw a photo of Kamala Harris giving someone a hug at a campaign event and I realized she must be hugging and shaking hands with hundreds, if not thousands, of people every day. Trump is seeing approximately the same number of people every day.

Even for those running for congress, senate, county sheriff, etc - they're all doing daily events at a minimum during election time and touching / being in close proximity to so many people, and many candidates are quite elderly, but you rarely hear that a candidate has a sickness.

TLDR: How do Kamala and Trump shake so many hands and not get sick?