It’s not just a myth: birds can carry diseases that humans can contract. Pigeon and seagull droppings carry an increased risk of transmitting these diseases. That’s why it’s essential to protect buildings and other living spaces from infestations of these species. Here are some of the diseases and bacteria that humans can catch after contact with birds or their droppings: salmonellosis, E. coli bacteria, ornithosis, psittacosis, avian flu, fungal infections, bird mites, etc. You should know that birds can also carry pests, such as ticks or fleas.