Guinea Worm DiseaseThis disease may be on the verge of being completely eradicated, but that doesn't stop it from being one of the most disgusting things anyone has ever seen. The parasite enters the body through unsafe drinking water. When people drink water they become infected with water fleas that have hosted the larvae of the parasite. At first there are no symptoms, but about a year later blisters begin to develop on the feet or legs and then the fully developed adult worm crawls out of the host body within a few weeks. The pain is said to be intense and can incapacitate a person for weeks at a time. The pain may continue for months after the infection. The parasite must infect a person at least once a year to continue. Approximately 3.5 million cases occurred in 1986, but the disease has declined significantly over time and only 22 cases were reported in 2015. This disease will likely be the first parasitic disease to be completely eradicated in humans. Filariasis: This disgusting parasitic worm is spread by flies and mosquitoes. The adult worm spreads its larvae into the host's lymphatic system and causes blockage of the lymph nodes. This causes the host's body tissue to swell and create massive muscle deformations, otherwise known as elephantiasis. Elephantiasis mainly affects the legs and genitals. The disease also affects the eyes but can be easily detected through close inspection but commonly causes river blindness in the host. The parasite has been estimated to be a leading cause of blindness worldwide. Boy Fly Larvae The botfly is a regular family of flies that has the horrible habit of growing their larvae on the skin... in the middle of the paper. ...the now adult wasps simply fly away from the dead host caterpillar that served as their apartment during their developmental stages. Wasps are endemic to Europe and several tropical areas of the world. Leishmaniasis This parasite is spread through the bite of sandflies. There are three different types of infections and each shows different degrees of severity. The cutaneous form produces mild skin ulcers, the mucocutaneous form produces ulcers in the mouth and nose, and the visceral form of the disease begins with skin ulcers and then fever, low red blood cell counts, and an enlarged spleen and liver. The parasite is detected under a microscope and the guts can also be found by doing blood tests. There are 12 million people infected in 98 different countries and 2 million new cases are found every year. Furthermore, the disease kills 20 to 50 thousand people a year.