ehrlichiosis


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Related to ehrlichiosis: Human granulocytic ehrlichiosis

ehrlichiosis

(ârlĭkēō`sĭs), any of several diseases caused by rickettsia of the genus Ehrlichia. Ehrlichiosis is transmitted by ticks. Both human forms tend to develop about nine days after a tick bite. Symptoms include severe headache and chills and low white blood cell and platelet counts. The lack of a rash distinguishes them from Rocky Mountain spotted feverRocky Mountain spotted fever,
infectious disease caused by a rickettsia. The germ is harbored by wild rodents and other animals and is carried by infected ticks that attach themselves to humans.
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 and Lyme diseaseLyme disease
or Lyme borreliosis,
a nonfatal bacterial infection that causes symptoms ranging from fever and headache to a painful swelling of the joints. The first American case of Lyme's characteristic rash was documented in 1970 and the disease was first identified
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; lack of upper respiratory and gastrointestinal symptoms distinguishes them from influenzainfluenza
or flu,
acute, highly contagious disease caused by a RNA virus (family Orthomyxoviridae); formerly known as the grippe. There are three types of the virus, designated A, B, and C, but only types A and B cause more serious contagious infections.
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. Many cases are mild, and all are treatable with antibiotics (tetracycline and doxycycline); however, ehrlichiosis can be fatal in some cases when diagnosis and treatment are delayed.

It was known for years that certain species (some believe them to be variant strains of a single species) can cause disease in animals, for example E. canis in dogs and E. phagocytophila in sheep and cattle. In the mid-1980s human ehrlichiosis was first recognized. The causative agent was found to be E. chaffeensis. This form is now known as human monocytic ehrlichiosis. In 1990 another form of the disease, human granulocytic ehrlichiosis, was identified. The Ehrlichia organisms invade various white blood cells (see bloodblood,
fluid pumped by the heart that circulates throughout the body via the arteries, veins, and capillaries (see circulatory system; heart). An adult male of average size normally has about 6 quarts (5.6 liters) of blood.
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; immunityimmunity,
ability of an organism to resist disease by identifying and destroying foreign substances or organisms. Although all animals have some immune capabilities, little is known about nonmammalian immunity.
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). E. chaffeensis invades monocytes; granulocytic Ehrlichia invades granulocytes.

ehrlichiosis

[är‚lik·ē′ō·səs]
(medicine)
A tick-borne bacterial infection caused by two distinct Ehrlichia species that infect white blood cells; the infection may be asymptomatic, but it also can produce illness ranging from a few mild symptoms to an overwhelming multisystem disease.
References in periodicals archive ?
In contrast, human ehrlichiosis is caused primarily by E.
The risk of ehrlichiosis, another potentially fatal disease of dogs most common in the South, also appears to be a threat as far north as New England, as well as in far reaching areas of the country like California and the Southern Plains states.
The patients were thought to have Ehrlichiosis, but failed to improve upon treatment with antibiotics.
At the time of this study, few physicians had even heard of Ehrlichiosis, which once was thought to be strictly a dog disease.
phagocytophilum for human ehrlichiosis, it is common for persons afflicted with Babesia to have concurrent infections.
Being from Long Island, the differential diagnosis included babesiosis and ehrlichiosis as well as bacterial sepsis.
1) They also may play a role in the spread of human diseases, according to a study of ehrlichiosis and its relationship to the noxious weed Amur honeysuckle (Lonicera maackii).
Post-release from the hospital, results came back seropositive (private laboratory, Tampa) for Ehrlichia chaffeensis, the causative agent of human monocytic ehrlichiosis (HME).
However, there is not yet any data about human ehrlichiosis causing CTP.
Ehrlichiosis, caused by small spherical-to-ellipsoidal gram-negative bacteria, has symptoms that are very similar to Lyme disease but more severe.
Some of the more common include: Babesiosis, Ehrlichiosis, Lyme disease, and Rocky Mountain spotted fever.
Since the end of the 20th century, several tick-borne diseases have been identified throughout the United States, including babesiosis, Lyme disease, and ehrlichiosis.