I doubt whether anyone ever fell ill because a dog or a child was near them in a cafe.

Doubt all you want. Have any evidence?

Near them" perhaps not. After having touched them, or touching something that they had prevoisly touched, licked, or rubbed their butts or other parts of their anatomies against, most assurecly so.

How about a nice case of roundworms? Or toxoplasmosis? or ringworm? What about Campylobacteriosis? Or tapeworm?

Maybe you'd prefer Scabies? What about the ever upular Leptospirosis??

And that's only a small selection of what's available from dogs & cats.

Look it up.

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Donuel- that's a small price to pay for idiots with no responsibility.
Tracking traces into the house is also not recommended - see above.