Ranging from several feet long, to microscopic, parasites are easily some of the most disgusting creatures on earth. Many will suck its host’s blood, while others will give it’s host life-threatening diseases, or even both! Some of the most common examples are the mosquito, or the tick, but there are many more than those. Many parasites will hurt a lot, while others will sit there, feasting painlessly, until they are noticed. Some of the most painful parasites are the screwworm fly, the guinea worm, the brain-eating amoeba, the mosquito, and lastly, the tick.First, easily one of the most disgusting parasites, as well as a really painful one, is the screwworm fly. The fly gets its name because the larvae has ridged spines, which give the worm a screw-like appearance. The screwworm fly has been controlled by scientists by sterilizing male flies (“Blow-fly”). The female fly is attracted to open wounds, and if found, it will immediately lay down 100-300 eggs at the site of the wound, weather it is a human or animal. In about 24 hours, the larvae of the eggs will hatch from the eggs, and feed on the wound and the flesh near it. It takes about one to two weeks for the larvae to fully develop. If left untreated, the infestations could be fatal, where the host is eaten alive, but it is unlikely for that to happen (Drees).The guinea worm, or dracunculiasis, is an exceptionally painful parasite. According to cdc.gov, People or animals can get the guinea worm by drinking water that has infected water fleas that carry the larvae. The drinker’s stomach acids dissolve the flea, releasing the larvae, where they go to grow to two to three feet inside its host. When the adult female is ready to come out, it will form a blister and come out slowly and release more larvae when the blister is put into water. The blister is usually on the legs or feet (Guest). The larvae of the guinea worm will only survive three days in water, unless eaten by a water flea. Inside the flea, for two weeks, the larvae will molt twice and become stage three larvae, which will be able to infect humans or animals (guinea-worm). According to world book online, “as the worm emerges, the host may experience itching, fever, weakness, swelling, and burning sensations.” There is also no cure for once the worm is inside you, except to pull it out, but can be easily prevented by filtering drinking water, and some international organisations have started campaigns to end guinea worms (Bary). Medicinenet.com says that guinea worm disease is very serious because it can and will cause unneeded suffering to those infected, it can be a social and/or financial burden, and the worms come out slowly, causing great pain and will disable the host.Another painful parasite, whose name sounds like it comes right from a horror movie, is the brain-eating amoeba. Brain-eating amoeba is a single cell organism; it causes “primary amebic meningoencephalitis,” or PAM. PAM destroys brain tissue and causes swelling and death. Someone can get the disease by swimming in warm freshwater, and getting the amoeba up the nose (“prevent brain-eating amoeba”). From 1962 to 2015, 138 cases of people with the infection have been reported, but only three of them have survived. The first survivor of the infection was a nine year old girl in California, in 1978. The girl went swimming for two days in a hot springs, and when the doctors found the symptom, they loaded the girl with a bunch of drugs like amphotericin B and miconazole. Since of November 2015, seven people have been reported to survive, proving the advances in modern-day medicine (Vallente). According to cdc.gov, “the fatality rate is 97%.” They also mention that some of the drugs tested in the lab have not been able to be tested since of the high fatality rate. Brain-eating amoeba is found all over the world. The majority of infections of it are found in the United States south. It is found in warm freshwater, hot springs, warm water discharge from industrial plants, poorly maintained swimming pools, and water heaters (naegleria).While they are not so painful when they are feasting, the mosquito has many opportunities to cause later pain. Mosquitos are found all over the world, but the majority live in the tropics and subtropics. The female mosquitoes lay their eggs in flooded areas, and the eggs hatch after a few hours. They stay in the water for a few weeks until the are adults, and mate shortly after they emerge. The female lives for about a month (Klouden). Most species of larvae feed on algae and organic debris, but some may feed on other mosquitos. Mosquitos will transmit diseases such as yellow fever, zika virus, malaria, filariasis, and dengue. The males feed on nectar and plant juice, and so will females, but the female will also suck blood because they need the protein for their eggs. There are three important mosquito classifications. One is anopheles, and is the only know carrier of malaria. They can be easily identified by its resting position. Culex are carriers of viral encephalitis, and in some places, it can also carry filariasis. The last one, aedes, has pathogens that can cause yellow fever, dengue, zika, and encephalitis (“mosquito”). According to national geographic, mosquitos use exhaled carbon dioxide, body odors, and temperature to find their next victim. Female mosquitos use two tubes, one to inject an enzyme to prevent blood from clotting up, and the other to suck blood (“mosquitos”).There are several different types of ticks, and these pain-causing parasites each has their own uniqueness. According to orkin.com, There are two different types of ticks, hard ticks and soft ticks. Soft ticks have a wrinkled body, and they don’t have a scutum, which is a plate on the tick’s back. Male soft ticks and female ones are usually about the same size. Hard ticks, which latch on and stay on, can transmit more diseases than soft ticks, because of their more parasitic nature (“hard/soft tick difference”). Adult ticks can range up to 30 millimeters in size, but are usually 15. Hard ticks can damage its host by drawing lots of blood, and can also secrete toxins that can give someone paralysis or death. They also spread diseases like the most commonly know lyme disease (“tick”). One certain tick, the lone star tick, which got its name because of the “star” on its back, can give a person allergic reactions to red meat. Red meat has a certain sugar in it called galactose-alpha-1,3-galactose. The tick can and will give someone an allergic reaction to said sugar, meaning that the person can’t eat any red meat.All in all, parasites come in all shapes and sizes, and will spread many diseases that range from being uncomfortable, all the way to being fatal. While some are several feet long, to microscopic, it is safe to say no one likes them. Some, like the guinea worm, the screwworm fly, and the brain-eating amoeba attack from the inside of your body, others like the mosquito and tick, like the outside. While these are just a few of the millions of parasites, they all will take something away from a host, and not give anything in return. It is safe to say that these are easily some of the most painful parasites.