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Human granulocytic anaplasmosis (HGA) is a tick-borne, infectious disease caused by Anaplasma phagocytophilum, an obligate intracellular bacterium that is typically transmitted to humans by ticks of the Ixodes ricinus species complex, including Ixodes scapularis and Ixodes pacificus in North America.
Since 1990, incidence of HGA has increased, and it is now recognized in Europe. This disease was first identified due to a Wisconsin patient who died with a severe febrile illness two weeks after a tick bite. During the last stage of the infection, a group of small bacteria was seen within the neutrophils in the blood. Other symptoms include ...
Tick-borne diseases, which afflict humans and other animals, are caused by infectious agents transmitted by tick bites. [1] They are caused by infection with a variety of pathogens, including rickettsia and other types of bacteria, viruses, and protozoa. [2] The economic impact of tick-borne diseases is considered to be substantial in humans ...
People who develop a rash or flu-like symptoms after a tick bite should contact their healthcare provider, the Health Department says. The U.S. Centers for Disease Control provides an overview of ...
In the weeks following a tick bite, you may start to feel flu-like symptoms such as a fever, headache, chills, fatigue, and muscle and joint pain. Some people also develop a distinctive "bullseye ...
E. chaffeensis causes human monocytic ehrlichiosis and is known to infect monocytes. [1] It has also been known to infect other cell types such as lymphocytes, atypical lymphocytes, myelocytes, and neutrophils, but monocytes appear to best harbor the infection. [1] E. chaffeensis has also been shown to infect canines both naturally [6] and ...
Ehrlichiosis ewingii infection [1] is an infectious disease caused by an intracellular bacteria, Ehrlichia ewingii. [2] The infection is transmitted to humans by the tick, Amblyomma americanum . This tick can also transmit Ehrlichia chaffeensis , the bacteria that causes human monocytic ehrlichiosis (HME).
Colorado tick fever virus can cause a fever, chills, headache, photophobia, myalgia, arthralgia, and lethargy. Children, in particular, may develop a hemorrhagic disease. Leukopenia with both lymphocytes and neutrophils is very common for Colorado tick fever virus. In either case, the infection can lead to encephalitis or meningitis. [3]