I'm not saying to make them pets LOL.
I just hope they aren't killing them. As far as the feces, pigeon poo carries toxins too, but as long as you aren't rolling in piles of the stuff naked, I am pretty sure you would be ok.
One of my favorite "dirty jobs" episodes was the one where he went into brakken cave and saw the MILLIONS of bats. The guano was at least a couple of feet deep, the only thing they were worried about was the ammonia and the flesh eating beetles. I think the disease that you are thinking of is histoplasmosis and is very rarely anything more than just a small case of the flu.
H. capsulatum is found throughout the world and is
endemic in certain areas of the
United States, particularly in states bordering the
Ohio River valley and the lower
Mississippi River. (Positive histoplasmin skin tests occur in as many as 80% of the people living in areas where
H. capsulatum is common, such as the eastern and central United States.) H. capsulatum grows in soil and material contaminated with bird or bat droppings (
guano). The fungus has been found in poultry house litter, caves, areas harboring bats, and in bird roosts (particularly those of
starlings). The fungus is
thermally dimorphic. In the environment it grows as a brownish
mycelium, whereas at body temperature (37°C in humans) it morphs into a
yeast. The inoculum is represented principally by
microconidia that, once inhaled into the
alveolar spaces, germinate and then transform into budding yeast cells. Histoplasmosis is not contagious, but is contracted by inhalation of the spores from disturbed soil or guano.