Prevention of Parasite Some preventive measures can be taken to fight backany parasite that infects humans. This action is designed to break the chain of transmission cycles and is very important for the successful eradication of parasitic diseases. These steps include: 1) reducing sources of infection. Diagnosis and treatment of parasitic diseases is an important component in preventing the spread of infectious agents. 2) control of sanitation of drinking water and food. 3) proper waste disposal. 4) use of insecticides and other chemicals used to control vector populations. 5) protective clothing that prevents vectors from landing on the surface of the body and introducing pathogens during blood feeding. 6) good personal hygiene. 7) avoid unsafe sexual practices • parasitological classification Parasites that are important in medicine fall under the kingdoms Protista and Animalia. Protists include celled eukaryotessingle microscopic species known as protozoa. In contrast, multicellular worms have well-differentiated tissues and complex organs that are animalia. Medical parasitology is generally classified into: a. Medical protozoology, concerned with the study of medically important protozoa. •Protozoa Protozoan parasites are single cell organismsMorphologically and functionally it can perform all life functions. Parasitic protozoa have organs that are transformed from the active stage (trophozoite) to the inactive stage, losing their motility and encasing themselves in strong walls. The protoplasmic body that forms is known as the cyst stage. At the cyst stage the parasite loses the power to grow and reproduce. Cysts are the survival stage of the parasite and the infective stage for the human host. a. Medical helminthology, concerned with the study of helminth parasitesthat affects humans. Worm parasites are multi-celled, bilateral animalssymmetrical, and has three germ layers. Helminth parasites of importance to humans are divided into three main groups with different category specificities b. Medical entomology, concerned with the study of arthropodscause or transmit disease to humans. • Arthropods Arthropods are the largest group of species withinanimal kingdom. Characterized by having a bilaterally symmetrical and segmented body with jointed appendages, it has a hard exoskeleton, which helps encase and protect muscles and other organs. Arthropods affect human health, as direct causes of disease or carriers for disease transmission. Arthropods that are important for health are found in the Insecta, Arachnida and Crustacea classes which have their own characteristics