1:Bed Bug -
The bedbug is a small, wingless, parasitic, bloodsucking insect that feeds on mammals, especially people. The bedbug, often a carrier of infectious diseases, is so named because it often infests beds. They can grow to 5 mm in length and can drink up to six times their size in blood -- furthermore they can lie dormant for up to 550 days without food.
2:Blood flukes -
This image reveals the intestinal Schistosoma mansoni, one of the species of blood flukes that cause the disease known as schistosomiasis. The males are thick and blue; the females are thin and clear. While in larval form blood flukes enter the bloodstreams of people or animals exposed to contaminated water in tropical and subtropical climates, and then lay their eggs inside the host's body. The disease's symptoms, which include diarrhoea, inflammation, and haemorrhage, vary in humans depending on the species of fluke and what part of the body it infests. The disease may be fatal if untreated.
3:A human louse -
The human head louse, Pediculus humanus, is one of several kinds of lice with mouthparts specialized for sucking blood. The small, wingless insect has a flattened body about 3 mm long (1/8 in), with a claw on the end of each leg that helps it cling to the hair of its host. Females lay whitish eggs, called nits, once a day, attaching them to the hair with a sticky substance until they hatch in about a week. Head lice are unpleasant and undiscriminating guests. They infest people who bathe often as well as those who do not, leaving itchy red spots on their hosts' scalps.
4:The dustmite -
The dust mite is a microscopic insect that lives in human homes, where it feeds on the dust produced by human and animal skin. Dust mites, about 0.5 mm in length, are not harmful in themselves, but their droppings, which contain left-over digestive enzymes, are a significant cause of asthma and other allergic diseases. A person sheds enough skin annually to feed approximately one million dust mites.
5:E. coli -
E. coli bacteria normally inhabit the human and animal intestinal tract and are vital to processing vitamins in the diet. But they can become pathogenic and cause infections, such as urinary tract infections. E-coli infection from undercooked meat can be potentially life threatening.
6:The human flea -
Fleas are common bloodsucking parasites. Having no wings, a flea cannot fly, but, having a flat body, it slips through the strands of its host's hair or fur quite easily on its powerful legs. Only about 3 mm (0.125 in) long, the human flea, Pulex irritans, can jump as far as 33 cm (13 in). Fleas can be quite dangerous because they can carry disease from one host to the next.
7:Streptococcus -
A common pathogenic bacterium found in the mouth, throat, respiratory tract, bloodstream, and lesions of humans is Streptococcus pyogenes. Often airborne in hospitals, schools, and other public places, this bacterium is responsible for a number of human ailments, such as strep throat. Cultures of non-pathogenic lactic streptococci are used in the fermentation of dairy products such as cheese and buttermilk.
8:Trypanosomes -
Trypanosomes are parasitic, flagellate protozoa that cause sleeping sickness and Chagas' Disease in humans. The characteristically long, wavy trypanosomes can be seen among the doughnut-shaped red blood cells in this blood sample taken from someone with sleeping sickness. It is carried by the infected tsetse fly.
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