"Parasitic infections" refers to illnesses caused by tiny organisms called parasites, which can enter the body and live off of another organism, harming it in the process. Full definition
One of the most common and prevalent signs of parasitic infection of the respiratory tract is coughing. (wagwalking.com)
Genes were identified linking feeding behaviour to control of parasitic infection in N'Dama, horn development and coat colour in the Ankole and thermo - regulation (heat tolerance) in the three zebu breeds. (sciencedaily.com)
Cats are susceptible to many different types of parasitic infections such as heartworms, hookworms, roundworms, tapeworms, whipworms and ringworm (which isn't actually a worm, but a fungus.) (vetinfo.com)