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They are caused by Yersinia pestis bacteria spreading from flea bites through the bloodstream to the lymph nodes, where the bacteria replicate, causing the nodes to swell. [3] Plague buboes may turn black and necrotic , rotting away the surrounding tissue, or they may rupture, discharging large amounts of pus . [ 3 ]
What they look like: Often confused with mosquito bites, bed bug bites are small, red, puffy bumps that appear in lines or clusters, usually three or more. They can have distinct red marks at ...
The foregut of this flea is blocked by a Y. pestis biofilm; when the flea attempts to feed on an uninfected host, Y. pestis from the foregut is regurgitated into the wound, causing infection. The bubonic plague is an infection of the lymphatic system, usually resulting from the bite of an infected flea, Xenopsylla cheopis (the Oriental rat flea ...
A venomous spider bite (like this brown recluse bite) can cause a red or purplish rash radiating from the site of the bite. There are only a few species of spiders in the U.S. that can bite humans.
The bite is typically painless, but causes itching. [16] Scratching at the bite introduces the T. cruzi-laden feces into the bite wound, initiating infection. [16] In addition to classical vector spread, Chagas disease can be transmitted through the consumption of food or drink contaminated with triatomine insects or their feces. [22]
The bubonic and septicemic forms are generally spread by flea bites or handling an infected animal, [1] whereas pneumonic plague is generally spread between people through the air via infectious droplets. [1] Diagnosis is typically by finding the bacterium in fluid from a lymph node, blood or sputum. [2] Those at high risk may be vaccinated. [2]
Cellulitis is most often a clinical diagnosis, readily identified in many people by history and physical examination alone, with rapidly spreading areas of cutaneous swelling, redness, and heat, occasionally associated with inflammation of regional lymph nodes. While classically distinguished as a separate entity from erysipelas by spreading ...
A bite is defined as coming from the mouthparts of the arthropod. The bite consists of both the bite wound and the saliva. The saliva of the arthropod may contain anticoagulants, as in insects and arachnids which feed from blood. Feeding bites may also contain anaesthetic, to prevent the bite from being felt.