5teady, yes, you really should be washing your hands. The chances are low, but not zero. The tuberculosis bacteria is zoonotic (ha! I've been waiting to use that word since I learned what it meant -- "Zoonotic diseases are diseases caused by infectious agents that can be transmitted between (or are shared by) animals and humans.") though the TB bacteria that infects human usually only causes a mild reaction to humans. There is a chance there is salmonella bacteria in the water, though again that it rare. Here is an article of possible things that could be in the tank that are dangerous:
<a href="http
/www.aquarticles.com/articles/manage...r_Aerosols.html" target="_blank">http
/www.aquarticles.com/articles/manage...r_Aerosols.html</a>
see also
+++ I can't get the link to work right because there are spaces in the URL, but the link to other fish disease that can infect humans is in the above link. It's under point #5 about 75% of the way down the page +++
But, again, I stress that these things are exceptionally, exceptionally rare.
On the great scheme of things to be worried about in life, you are much, much more likely to be killed by getting hit by a bus crossing the street than a disease from your fish tank. I don't expend much worry about fish disease getting me at all.
It's just a good idea not to be dumb about these kind of things, and just take 12 extra seconds to wash your hands after you are done. If your immune system should ever be compromised, like if you needed chemotherapy for cancer, or if you contracted AIDS or if you needed to be extra careful like if you ever got pregnant, then getting some large gloves or getting someone else to do the work is probably a good idea. But, really, for the large majority of us, there is nothing to worry about.