Absolutely. Just like most wild animal feces, bird feces contains dangerous bacteria and viruses that can be harmful or deadly to people or our pets. Histoplasmosis is a human health hazard that can be caused by fungus found in bird and bat droppings. Most human cases include only mild symptoms such as fever, shills, headaches, muscle aches, dry cough, chest discomfort and fatigue. However, more severe symptoms (usually in people with compromised immune systems) can affect any part of your body and can be fatal if left untreated.