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Dog fleas had not been found in Virginia in more than 70 years, and may not even occur in the US, so a flea found on a dog is likely a cat flea (Ctenocephalides felis). [31] [32] One theory of human hairlessness is that the loss of hair helped humans to reduce their burden of fleas and other ectoparasites. [33]
The fleas that transmit the disease only directly infect humans when the rat population in the area is wiped out from a mass infection. [16] Furthermore, in areas with a large population of rats, the animals can harbor low levels of the plague infection without causing human outbreaks. [ 15 ]
[5] [6] The dynamic complexities of rat ecology, herd immunity in that reservoir, interaction with human ecology, secondary transmission routes between humans with or without fleas, human herd immunity, and changes in each might explain the eruption, dissemination, and re-eruptions of plague that continued for centuries until its unexplained ...
The most infamous flea-to-human transmitted disease is the bubonic plague, which was caused by the bacterium Yersinia pestis. ... (0.04 to 0.15 inches), wingless, blood-sucking fleas that live on ...
This led to the establishment of a Public Health Department there which undertook some leading-edge research on plague transmission from rat fleas to humans via the bacillus Yersinia pestis. [182] The first North American plague epidemic was the San Francisco plague of 1900–1904, followed by another outbreak in 1907–1908. [183] [184] [185]
Ships arriving in US ports were declared clean after inspection of the passengers showed no signs of disease. Health officials conducted no tests on rats or fleas. [16] Despite important advances in the 1890s in the fight against bubonic plague, many of the world's doctors did not immediately change their ineffective and outdated methods. [16 ...
Thousands of people each year; mainly those who are untreated Septicemic plague is one of the three forms of plague , and is caused by Yersinia pestis , a gram-negative species of bacterium . Septicemic plague is a systemic disease involving infection of the blood and is most commonly spread by bites from infected fleas.
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