The invisible war inside the bloodstream: how Anaplasma destroys red blood cells
In short: It begins with a tick bite, but the real damage happens deep within the host. Anaplasma bacteria hijack red blood cells, triggering an immune response so aggressive that the body begins destroying its own healthy cells, leading to severe anemia and a characteristic jaundiced appearance.
Anaplasmosis is a bacterial disease caused by various species of the genus Anaplasma, affecting a wide range of hosts including horses, dogs, and ruminants. The primary pathogens, Anaplasma marginale and Anaplasma phagocytophilum, are Gram-negative microorganisms that specifically target and infect red blood cells. Once the bacteria multiply within the bloodstream, the host's immune system attempts to eliminate the infected cells, but in the process, it also destroys uninfected red blood cells. This leads to a depletion of cells that exceeds the body's ability to replace them, resulting in anemia and potential cardiovascular strain, such as increased heart rates.
Transmission occurs through both biological and mechanical vectors. Biological transmission is driven by ticks, most notably Ixodes scapula (the black-legged or deer tick), which can carry the parasite for months in a dormant state. Mechanical transmission can occur through biting flies or via contaminated medical equipment, such as needles, dehorners, or surgical instruments. In cattle, the disease is particularly persistent; once an animal is infected, it becomes a permanent carrier, and the infection can even be passed to calves at birth.
Clinical symptoms, such as fever, weight loss, and jaundice, typically do not manifest until three to six weeks after the initial infection. While the disease was once a major economic burden in the Western United States, the widespread use of tetracycline drugs in the 1980s and 1990s has helped mitigate its impact. However, challenges remain. While some vaccines exist, there are currently no USDA-approved live or inactivated vaccines effective against all strains of A. marginale. In some regions, such as northern Iran, studies have found significant prevalence in horses, with infection rates reaching as high as 24.3% in specific areas like Aq Qala.
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Sources
- Summary by Intellect · source: Anaplasmosis
- Also: Molecular Detection of Anaplasma spp. in Horses From Golestan Province, Northern Iran.
- Also: www.cdc.gov — About Anaplasmosis
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