an·​a·​plas·​mo·​sis | \ ˌa-nə-ˌplaz-ˈmō-səs How to pronounce anaplasmosis (audio) \
plural anaplasmoses\ ˌa-​nə-​ˌplaz-​ˈmō-​ˌsēz How to pronounce anaplasmosis (audio) \

Definition of anaplasmosis

: a tick-borne disease of cattle and sheep caused by a bacterium (Anaplasma marginale) and characterized especially by anemia and by jaundice

Examples of anaplasmosis in a Sentence

Recent Examples on the Web Those who are older or who have weakened immune systems may be at risk for severe illness due to anaplasmosis. Alexandria Hein, Fox News, 2 July 2021 Other tick-borne diseases include anaplasmosis, babesiosis, ehrlichiosis, spotted fever rickettsiosis and tularemia. Rachel Trent, CNN, 12 July 2021 The county’s health commissioner said Thursday that there have been six cases of anaplasmosis already reported in 2021, compared to just three cases reported over the last five years. Alexandria Hein, Fox News, 2 July 2021 What's the difference between Lyme disease and anaplasmosis? Maggie O'neill,, 29 June 2021 Symptoms can vary, depending on the specific tick-borne disease, including Lyme disease, Rocky Mountain Spotted Fever, anaplasmosis, babesiosis and tularemia. Sarah Michels, The Enquirer, 13 June 2021 Ticks have the ability to spread dangerous diseases, including Lyme disease, anaplasmosis and babesiosis, in as little as 36-48 hours after the initial bite, according to Mannes. Sudiksha Kochi, USA TODAY, 2 June 2021 Cases of Lyme disease, Powassan virus; spotted fever rickettsiosis, including Rocky Mountain spotted fever, anaplasmosis, ehrlichiosis, babesiosis and tularemia all increased last year. Ashley Welch, CBS News, 14 Nov. 2018 And in Michigan, health officials are warning against anaplasmosis, a tick borne disease that mimics COVID-19 symptoms. Alex Connor, USA TODAY, 6 July 2020

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'anaplasmosis.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of anaplasmosis

1910, in the meaning defined above

History and Etymology for anaplasmosis

New Latin Anaplasma, genus of gram-negative bacteria (from ana- ana- — perhaps erroneously for a- a- entry 2 — + -plasma -plasm) + -osis

Note: The genus name Anaplasma was introduced by the Swiss veterinarian Arnold Theiler (1867-1936) in "Anaplasma marginale (Gen. and spec. nov.): The Marginal Points in the Blood of Cattle Suffering from a Specific Disease," Transvaal Department of Agriculture, Report of the Government Veterinary Bacteriologist for the Year 1908-09 (Pretoria, 1910), pp. 7-63. Anaplasma marginale was the first rickettsial pathogen to be investigated, and Theiler was unsure of the nature of the organism: "All these various reasons induce me to consider the marginal points as parasites of protozoic character. They differ from any known blood parasite by the absence of a protoplasmatic body and consist only of chromatin substance, thus resembling, to a certain extent, the bacteria. They represent, in my opinion, a new genus of protozoa which I propose to call Anaplasma, and the species under consideration Anaplasma marginale" (p. 29). This comment would lead one to believe that Theiler actually had alpha privative in mind, and should have named the organism Aplasma rather than Anaplasma—it is not evident what significance the spatio-temporal prefix ana- could have here.

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The first known use of anaplasmosis was in 1910

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Last Updated

1 Jan 2022

Cite this Entry

“Anaplasmosis.” Dictionary, Merriam-Webster, Accessed 29 Jan. 2022.

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More Definitions for anaplasmosis


an·​a·​plas·​mo·​sis | \ -ˌplaz-ˈmō-səs How to pronounce anaplasmosis (audio) \
plural anaplasmoses\ -​ˌsēz How to pronounce anaplasmosis (audio) \

Medical Definition of anaplasmosis

: infection with or a disease caused by bacteria of the genus Anaplasma affecting both humans and animals (such as dogs, horses, and cattle): such as
a : a disease of humans that is typically marked by fever, headache, chills, muscle aches, and fatigue and is caused by a bacterium (A. phagocytophilum synonym Ehrlichia phagocytophila) infecting granulocytes

called also ehrlichiosis, human granulocytic anaplasmosis, human granulocytic ehrlichiosis

b : a disease of cattle that is typically marked by anemia, fever, jaundice, weight loss, and death especially in adult animals and is caused by a bacterium (A. marginale) which infects and destroys red blood cells

called also gall sickness, galziekte


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