Parasitic infections are infectious diseases caused by parasites. Malaria and toxoplasmosis are two examples of parasitic diseases. Malaria is typically transmitted through the bite of an infected mosquito and can cause symptoms like vomiting, abdominal pain, and muscle pain. Toxoplasmosis is caused by a parasite found in cat feces and undercooked meat that can be dangerous for pregnant women and cause birth defects if transmitted to the fetus. Both diseases are transmitted through contaminated food, water, blood, or from infected animals or mosquitoes.