Originally published on MannaPro.com Infectious horse diseases are those that horses can get from each other, or via a transmitter such as a mosquito or tick, which may transmit the disease from horse to horse. Knowledge is key to prevention. Here are some of the most common horse diseases: Potomac Horse Fever This disease is most often seen in spring, summer, and early fall and is associated with pastures bordering water sources such as creeks or rivers. PHF is an acute ente