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Scabies (/ ˈ s k eɪ b iː z, ˈ s k eɪ b i iː z /; [10] also sometimes known as the seven-year itch) [1] is a contagious human skin infestation by the tiny (0.2–0.45 mm) mite Sarcoptes scabiei, [1] [3] variety hominis. The word is from Latin: scabere, lit. 'to scratch'. [11] The most common symptoms are severe itchiness and a pimple-like ...
What they look like: Chiggers, a type of small mite, typically leave clusters of bites that are often very itchy. In many cases, chigger bites appear as small, red and itchy bumps. Sometimes, they ...
They are primarily transmitted by direct human to human contact. But they can be transmitted without touching another human if scabies are on blankets, towels, sheets, and other personal items.
Cat-scratch disease has a worldwide distribution, but it is a nonreportable disease in humans, so public health data on this disease are inadequate. [22] Geographical location, present season, and variables associated with cats (such as exposure and degree of flea infestation ) all play a factor in the prevalence of CSD within a population. [ 23 ]
Stings containing venom are more likely to be painful. Less frequently, venomous spider bites are also associated with morbidity and mortality in humans. Most arthropod stings involve Hymenoptera (ants, wasps, and bees). While the majority of Hymenoptera stings are locally painful, their associated venom rarely cause toxic reactions unless ...
Pyemotes tritici is a parasite of arthropods. The females puncture the host with her stylet, injecting a toxic venom that paralyses the host, which eventually dies. [3] The Angoumois grain moth (Sitotroga cerealella) is a pest of stored grain, laying its eggs on the seedheads in the field or on the grain in the silo.
Bartonella henselae, formerly Rochalimæa henselae, is a bacterium that is the causative agent of cat-scratch disease [1] (bartonellosis). Bartonella henselae is a member of the genus Bartonella, one of the most common types of bacteria in the world. [specify] It is a facultative intracellular microbe that targets red blood cells.
In the human host, Loa loa larvae migrate to the subcutaneous tissue, where they mature into adult worms in approximately one year, but sometimes up to four years. Adult worms migrate in the subcutaneous tissues at a speed of less than 1 cm/min, mating and producing more microfilariae. The adult worms can live up to 17 years in the human host. [5]