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Bed bug

Bed bugs are insects from the genus Cimex, which are parasites that feed on blood, usually at night. Their bites can result in a number of health issues, including skin rashes, psychological effects, and allergic symptoms. Bed bug bites may lead to skin changes ranging from small areas of redness to prominent blisters. Symptoms may take between minutes to days to appear and itchiness is generally present. Some individuals may feel tired or have a fever. Typically, uncovered areas of the body are affected. Their bites are not known to transmit any infectious disease. Complications may rarely include areas of dead skin or vasculitis.

Effects on humans
Bed bugs infest dwellings and bite people, causing irritation and sometimes other issues. There is no evidence that bed bugs transmit infectious diseases, As each bite takes a tiny amount of blood, chronic or severe infestation may lead to anemia. Systemic poisoning may occur if the bites are numerous. The bite itself may be painful thus resulting in poor sleep and worse work performance. The signs left by the bites are the same as in the case of people and cause identical symptoms (skin irritation, scratching etc.). Bed bugs can infest poultry sheds and cause anemia and a decrease in egg production in hens. Treatment Treatment of bed bug bites requires keeping the person from being repeatedly bitten, and possible symptomatic use of antihistamines and corticosteroids (either topically or systemically). However, there is no evidence that medications improve outcomes, and symptoms usually resolve without treatment in 1–2 weeks. ==Description==
Description
Bed bug infestations are primarily the result of two species of insects from genus Cimex: Cimex lectularius (the common bed bug) and Cimex hemipterus (the tropical bed bug). Bed bugs need at least one blood meal in order to advance to the next stage of development. Newly hatched nymphs are translucent, lighter in color, and become browner as they moult and reach maturity. Bed bugs may be mistaken for other insects, such as booklice, small cockroaches, or carpet beetles; however, when warm and active, their movements are more ant-like, and like most other true bugs, they emit a characteristic disagreeable odor when crushed. Bed bugs are obligatory bloodsuckers. They have mouth parts that saw through the skin and inject saliva with anticoagulants and painkillers. Sensitivity of humans varies from extreme allergic reaction to no reaction at all (about 20%). The bite usually produces a swelling with no red spot, but when many bugs feed on a small area, reddish spots may appear after the swelling subsides. There is strong evidence that bed bugs can respond and orient towards human odors, independently of all other host cues. Cimex lectularius feeds only every five to seven days, which suggests that it does not spend the majority of its life searching for a host. When a bed bug is starved, it leaves its shelter and searches for a host. It returns to its shelter after successful feeding or if it encounters exposure to light. Cimex lectularius aggregate under all life stages and mating conditions. Bed bugs may choose to aggregate because of predation, resistance to desiccation, and more opportunities to find a mate. Airborne pheromones are responsible for aggregations. ==Infestation==
Infestation
Infestation is rarely caused by a lack of hygiene. that may also harbour bed bugs or related species such as the bat bug; • People visiting an infested area (e.g. dwelling, means of transport, entertainment venue, or lodging) and carrying the bugs to another area on their clothing, luggage, or bodies. Bedbugs are increasingly found in air travel. Though bed bugs will opportunistically feed on pets, they do not live or travel on the skin of their hosts, and pets are not believed to be a factor in their spread. Detection Knowing that symptoms are caused by bedbug bites rather than other causes requires seeking and finding the insect in the sleeping environment, as symptoms are not specific to bedbug bites. A severe bedbug infestation can be detected by their characteristic pungent sweet smell, which has been described as like rotting raspberries. Bed bug detection dogs are trained to pinpoint infestations, with a possible accuracy rate between 11% and 83%. Bedbug detectors, often referred to as "monitors", "traps" or "interceptors", use the lactic acid or carbon dioxide associated with the presence of a human body, or pheromones, to attract and trap bugs in a container. Bedbug detectors can confirm an infestation, but do not trap enough for eradication. File:Bedbugs1.jpg|Eggs and two adults found inside a dresser File:BedBugFeces.jpg|Fecal spot File:Bed Bug On Carpet.jpg|Bed bug on carpet Differential detection Other conditions which produce symptoms similar to bedbug bites include scabies, gamasoidosis, allergic reactions, mosquito bites, spider bites, flea bites (pulicosis), chicken pox, and bacterial skin infections. Additional preventative measures include sealing cracks and crevices (where bed bugs often hide), inspecting furniture, and decontaminating clothes and luggage upon returning home. Close all wall openings or gaps; bed bugs tend to hide in dark places such as cracks in walls. Second-hand furnishings may harbour bedbugs. Management Avoiding repeated bites can be difficult since it usually requires eradicating bed bugs from a home or workplace; eradication is most effective using non-chemical control methods. A study found 100% mortality rates for bed bugs exposed to temperatures greater than for more than 2 minutes. The study recommended maintaining temperatures of above for more than 20 min to effectively kill all life stages of bed bugs, and because in practice treatment times of 6 to 8 hours are used to account for cracks and indoor clutter. This method is expensive and has caused fires. Boric acid, sometimes applied as a safe indoor insecticide against pests such as cockroaches and termites, is not effective against bed bugs because they do not groom. ==Distribution==
Distribution
Bed bugs are found everywhere in the world. Before the 1950s about 30% of houses in the United States had bedbugs; The invention of the vacuum cleaner and simplification of furniture design may have also played a role in the decrease. The decrease in cockroach populations due to insecticide use may have aided bed bugs' resurgence, since cockroaches eat bedbugs. The U.S. National Pest Management Association reported a 71% increase in bed bug calls between 2000 and 2005. The number of reported incidents in New York City alone rose from 500 in 2004 to 10,000 in 2009. In 2013 Chicago was listed as the US city with most bedbug infestation. In response the Chicago City Council passed a bed bug control ordinance to limit spread. Additionally, bed bugs are reaching places in which they never established before, such as southern South America. The rise in infestations has been hard to track because bed bug infestation is not an easily identifiable problem, and those affected are not inclined to talk about it. Most reports have been collected from pest-control companies, local authorities, and hotel chains, and the problem may be more severe than is currently believed from reports. ==Species==
Species
The common bed bug (Cimex lectularius) is the species best adapted to human environments but is also known from birds, Chiroptera, Gallus (chickens and relatives), Myotis myotis, and sheep (Ovis aries). == Evolution ==
Evolution
Cimicidae, the ancestor of modern bed bugs, first emerged approximately 115 million years ago, more than 55 million years before bats—their previously presumed initial host—first appeared. From unknown ancestral hosts, a variety of different lineages evolved which specialized in either bats or birds. The common (C. lectularius) and tropical bed bug (C. hemipterus) split 40 million years before Homo evolution. Humans became hosts to bed bugs through host specialist extension (rather than switching) on three separate occasions. ==Historical reports==
Historical reports
Bed bugs were first mentioned in ancient Greece as early as 400 BC, and later by Aristotle. Pliny's Natural History, first published in Rome, claimed bed bugs had medicinal value in treating ailments such as snake bites and ear infections. Belief in the medicinal use of bed bugs persisted until at least the 18th century, when Guettard recommended their use in the treatment of hysteria. Bed bugs were also mentioned in Germany in the 11th century, in France in the 13th century, and in England in 1583, though they remained rare in England until 1670. Some in the 18th century believed bed bugs had been brought to London with supplies of wood to rebuild the city after the Great Fire of London (1666). Giovanni Antonio Scopoli noted their presence in Carniola (roughly equivalent to present-day Slovenia) in the 18th century. Traditional methods of repelling or killing bed bugs include the use of plants, fungi, and insects (or their extracts), such as black pepper; black cohosh (Actaea racemosa); Pseudarthria hookeri; Laggera alata (Chinese yángmáo cǎo | 羊毛草); henna (Lawsonia inermis or camphire); "infused oil of Melolontha vulgaris" (presumably cockchafer); fly agaric (Amanita muscaria); tobacco; "heated oil of Terebinthina" (i.e. true turpentine); wild mint (Mentha arvensis); narrow-leaved pepperwort (Lepidium ruderale); Myrica spp. (e.g. bayberry); Robert geranium (Geranium robertianum); bugbane (Cimicifuga spp.); "herb and seeds of Cannabis"; "opulus" berries (possibly maple or European cranberrybush); masked hunter bugs (Reduvius personatus), "and many others". In the mid-19th century, smoke from peat fires was recommended as an indoor domestic fumigant against bed bugs. Dusts have been used to ward off insects from grain storage for centuries, including plant ash, lime, dolomite, certain types of soil, and diatomaceous earth or Kieselguhr. Of these, diatomaceous earth in particular has seen a revival as a non-toxic (when in amorphous form) residual pesticide for bed bug abatement. While diatomaceous earth often performs poorly, silica gel may be effective. Basket-work panels were put around beds and shaken out in the morning in the UK and in France in the 19th century. Scattering leaves of plants with microscopic hooked hairs around a bed at night, then sweeping them up in the morning and burning them, was a technique reportedly used in Southern Rhodesia and in the Balkans. Bean leaves have been used historically to trap bedbugs in houses in Eastern Europe. The trichomes on the bean leaves capture the insects by impaling the feet (tarsi) of the insects. The leaves are then destroyed. 20th century Until the mid-20th century, bed bugs were very common. According to a report by the UK Ministry of Health, in 1933, all the houses in many areas had some degree of bed bug infestation. Bed bugs were a serious problem at US military bases during World War II. Initially, the problem was solved by fumigation, using Zyklon Discoids that released hydrogen cyanide gas, a rather dangerous procedure. The decline of bed bug populations in the 20th century is often credited to potent pesticides that had not previously been widely available. Other contributing factors that are less frequently mentioned in news reports are increased public awareness and slum clearance programs that combined pesticide use with steam disinfection, relocation of slum dwellers to new housing, and in some cases also follow-up inspections for several months after relocated tenants moved into their new housing. In early 2023, Orkin reported that Chicago, New York, Philadelphia, Cleveland and Los Angeles were the top five cities in the United States with most bed bug infestations. In France, these insects re-emerged, despite having disappeared from daily life in the 1950s, due to nomadic lifestyles, consumption of second-hand purchases, and bugs' resistance to insecticides, Between 2017 and 2022, 11% of French households were infested by bed bugs, according to a report from the National Agency for Food, Environmental and Occupational Health Safety (ANSES). In the middle of 2023, reports emerged of a bed bug infestation spread in the capital city of Paris, when it was first seen in cinemas, then it expanded to homes, trains, schools and even hospitals. Treatment of this outbreak has cost France an estimated €230m annually. In the meantime, the United Kingdom witnessed a 65% increase in year-on-year infestations across the country, according to Rentokil. In November 2023, it was reported that South Korea was experiencing a bed bug infestation. In late November 2025 it was reported that the Cinémathèque Française in Paris had to close its four screening halls for a month due to an infestation of bedbugs. ==Society and culture==
Society and culture
Legal action Bed bugs are an increasing cause for litigation. Courts have, in some cases, exacted large punitive damage judgments on some hotels. Many of New York City's Upper East Side homeowners have been afflicted, but they tend to remain publicly silent in order not to ruin their property values and be seen as suffering a blight typically associated with "lower social class." Local Law 69 in New York City requires owners of buildings with three or more units to provide their tenants and potential tenants with reports of bedbug history in each unit. They must also prominently post these listings and reports in their building. Idiom • "Good night, sleep tight, don't let the bed bugs bite," is a traditional saying. == References ==
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