Protozoal infections are diseases caused by single-celled organisms known as protozoa. These microscopic creatures can enter the human body through contaminated food, water, or insect bites. Common protozoal infections include malaria, amoebic dysentery, and giardiasis, which can lead to symptoms like diarrhea, fever, and abdominal pain. Treatment for protozoal infections often involves specific medications that target the parasites. Prevention strategies include practicing good hygiene, drinking clean water, and using insect repellent in areas where diseases like malaria are prevalent. Awareness and early diagnosis are crucial for effective management of these infections.