Guinea WormThis disease may be on the verge of being completely eradicated, but that doesn't stop it from being one of the grossest things that l 'we've never seen. The parasite enters the body through unsafe drinking water. When people drink water infected with water fleas that harbor the larvae of the parasite. At first there are no symptoms, but about a year later, blisters on the feet or legs begin to develop, and then the fully grown adult worm crawls out of the host body over a period of a few weeks. The pain is said to be intense and can paralyze a person for weeks. Pain may also persist for months after infection. The parasite must infect a person at least once a year to continue. There were an estimated 3.5 million cases in 1986, but the disease has been significantly reduced 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. FilariasisThis disgusting parasite is spread by flies and mosquitoes. The adult worm spreads its larvae throughout the host's lymphatic system and causes obstruction of the lymph nodes. This also causes the host's body tissues to swell and creates massive muscle deformities, also known as elephantiasis. Elephantiasis mainly affects the legs and genitals. The disease also affects the eyes, but this can be easily detected by careful inspection, but it usually causes river blindness in the host. This parasite is estimated to be one of the leading causes of blindness worldwide. ..... the now grown wasps simply fly away from the dead host caterpillar that served as their apartment throughout their developmental stages. Wasps are endemic to Europe and several tropical areas around the world.LeishmaniasisThis parasite is spread by the bite of sandflies. There are three different types of infections and each has varying 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, then fever, low red blood cell count, and enlargement of the spleen and liver. The parasite is detected under a microscope and viscerals can also be detected by doing blood tests. 12 million people are infected in 98 different countries and 2 million new cases are discovered each year. The disease also kills around 20 to 50,000 people per year.