I believe some cases have occurred when the person has unknowingly put their hand on grass soaked with rat urine and then rubbed their eyes or eaten something.Yes, Weil's disease, leptospirosis, spread by rats in watery habitats. Anyone getting immersed in dirty or stagnant water should get a checkup afterwards.
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I'm not a great one for sitting on the ground, but never do so near a river.
Rat bites can also be fatal through a rare allergic reaction.
A few years ago a woman tried to release a rat which had become entangled in her bird feeder.
The rodent repaid the kindness by biting and killing her.