tóng-àn:Bed bug, Cimex lectularius.jpg

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ID#: 9822

This 2006 photograph depicted an oblique-dorsal view of a bed bug nymph (Cimex lectularius) as it was in the process of ingesting a blood meal from the arm of a “voluntary” human host.

Bed bugs are not vectors in nature of any known human disease. Although some disease organisms have been recovered from bed bugs under laboratory conditions, none have been shown to be transmitted by bed bugs outside of the laboratory.

The common bed bug is found worldwide. Infestations are common in the developing world, occurring in settings of unsanitary living conditions and severe crowding. In North America and Western Europe, bed bug infestations became rare during the second half of the 20th century and have been viewed as a condition that occurs in travelers returning from developing countries. However, anecdotal reports suggest that bed bugs are increasingly common in the United States, Canada, and the United Kingdom.

C. lectularius inject saliva into the blood stream of their host to thin the blood, and to prevent coagulation. It is this saliva that causes the intense itching and welts. The delay in the onset of itching gives the feeding bed bug time to escape into cracks and crevices. In some cases, the itchy bites can develop into painful welts that last several days.

Bed bug bites are difficult to diagnose due to the variability in bite response between people, and due to the change in skin reaction for the same person over time. It is best to collect and identify bed bugs to confirm bites. Bed bugs are responsible for loss of sleep, discomfort, disfiguring from numerous bites and occasionally bites may become infected.
Ji̍t-kî
Chhut-chhù http://phil.cdc.gov/phil/details.asp?pid=9822
Chok-chiá Content Providers(s): CDC/ Harvard University, Dr. Gary Alpert; Dr. Harold Harlan; Richard Pollack. Photo Credit: Piotr Naskrecki
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(Bô siŏh-huòi sāi ciā ùng-giông)		 Copyright Restrictions: None – This image is in the public domain and thus free of any copyright restrictions. As a matter of courtesy we request that the content provider be credited and notified in any public or private usage of this image.

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本圖像是美國衛生及公共服務部所屬的美國疾病控制與預防中心的員工在職務期間所拍攝或繪製的。作為美國聯邦政府的作品，本圖片屬於公有領域。

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