That sounds like a coincidence.
Think of all the people, everyday, that accidentally get a mouthful of tank water while starting a siphon. Beyond that, millions more who are putting their hands in the tank for extended periods of time without consequences. Just having your hands in and getting splashed a bit will not hurt you.
I would not suggest drinking the water, but in general even that is not necessarily that big of a deal. The water that goes in the tank is drinking quality. Plus you treat it. And, you change it out with more drinking quality water. You certainly have the potential for some tummy-upsetting microbes to get in there though. So, I don't suggest drinking it.
There are a few diseases that could be potentially harmful, like TB. But, that is very rare in an aquarium setting, not really worth fretting over.
Also, keep in mind that most diseases have an incubation period and do not manifest symptoms mere hours after exposure.