English: Meet the world’s worst human parasites

 *Australian Paralysis Tick Ticks are considered ectoparasites, meaning thus they do their parasitic work on the outside of the body rather than internally. Their bite can transmit a number of nasty diseases, such as Lyme disease and rickettsia. Though, it's not the tick itself that causes the problem. The exception is the Australian paralysis tick, Ixodes holocyclus. This tick carries the usual assortment of diseases, but you can consider yourself lucky if you live long enough to get them. The paralysis tick secretes a neurotoxin that causes paralysis. If the toxin paralyzes the lungs, death from respiratory failure can result. – The good news is you only encounter this tick in Australia. The bad news is there is no antivenom.

*Filarial Worms and Elephantiasis. The WHO estimates over 120 million people are infected with filarial worms, a type of roundworm. The worms can clog lymphatic vessels.  One of the diseases they can cause is called elephantiasis. The name refers to the massive swelling and tissue deformity that results when lymphatic fluid can't drain properly. The good news is that most people infected with filarial worms show few or no signs of infection. – Roundworm infections occur in many ways. The parasites can slip between skin cells when you are walking through damp grass. You can also drink them in your water, or they can enter through the bite of a mosquito.

*Malaria is carried by the Anopheles mosquito. When the female bites you – males don't bite – some Plasmodium enters the body through the saliva. The single-celled organism multiplies inside red blood cells, eventually causing them to burst. The cycle is completed when a mosquito bites an infected host  Malaria merozoites ultimately rupture red blood cells, dispersing more parasites.  There are about 200 million cases of malaria each year. Malaria actually results from infection by a parasitic protozoan named Plasmodium. While the disease doesn't look as frightening as some parasitic infections, its fever and chills can progress to death. Treatments exist to reduce the risk, but there is no vaccine.

*Scabies Mite: (Sarcoptes scabiei) is a relative of the tick—both are arachnids, like spiders—but this parasite burrows into the skin rather than biting from the outside. The miteand the irritation to skin produce red bumps and intense itching. The skin becomes rigid and crusty from infection with millions of mites. Even if the infection is cured, the deformity remains. – This parasite is transmitted by contact with an infected person or his belongings.

*Screw worm Fly and Myiasis – “Cochliomyia hominivorax”. The name means "man-eating" and is a good description of what the larvae of this fly does. The female fly lays around 100 eggs in an open wound. Within a day, the eggs hatch into maggots that use their cutting jaws to burrow into the flesh, which they use as food. The maggots burrow through muscle, blood vessels, and nerves, growing the whole time. If someone attempts to remove the larvae, they respond by digging deeper. Only about 8% of infected people die from the parasite, but they suffer the agony of literally being eaten alive, plus the tissue damage can result in secondary infections. – The screwworm used to be found in the United States, but today you need to visit Central or South America to encounter it.

*Tape worm and Cysticercosis: There are many different tapeworms and many different hosts for the parasites. When you ingest the eggs or larval form of some tapeworms, they attach to the lining of the gastrointestinal tract, grow, and mature to shed segments of themselves or eggs. Aside from depriving the body of some nutrients, this type of tapeworm infection is not a serious health risk. However, if conditions aren't right for the larvae to mature, they form cysts. The cysts can migrate anywhere in the body, waiting for you to die and presumably be eaten by an animal that has a gut more suited to the worm. The cysts cause a disease called cysticercosis. Infection is worse for some organs than others. If you get cysts in your brain, it can lead to death. Cysts in other organs can put pressure on the tissue and deprive it of nutrients, reducing function.  - You can get tapeworms in many different ways. Eating snail larvae from improperly rinsed lettuce and watercress, undercooked pork or sushi as well as accidentally ingesting a flea or fecal matter, or drinking contaminated water are common routes of infection.

As always, stay safe!

– bird.

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