Child caught in liquid pigeon droppings. Is this dangerous?

Hello everyone, Today, while playing outside, my child (4 years old) got his whole hand in wet, liquid pigeon droppings/bird droppings. Some time had passed before we reached the next water basin. My child was now asleep and coughing unusually loudly. Coincidence? Hence my question: how and whether one can get sick from "moist, runny…