ehr·​lich·​i·​o·​sis | \ er-ˌli-kē-ˈō-sis How to pronounce ehrlichiosis (audio) \
plural ehrlichioses\ er-​ˌli-​kē-​ˈō-​ˌsēz How to pronounce ehrlichiosis (audio) \

Definition of ehrlichiosis

: infection with or disease caused by tick-borne bacteria (genus Ehrlichia of the family Anaplasmataceae)

Examples of ehrlichiosis in a Sentence

Recent Examples on the Web However, when caught early, ehrlichiosis can be treated with antibiotics. Lauren Krouse,, 18 May 2021 The center at The Miriam is a multidisciplinary center entirely dedicated to the treatment of acute Lyme disease, ehrlichiosis, babesiosis, and other tick-borne diseases., 22 July 2021 Other tick-borne diseases include anaplasmosis, babesiosis, ehrlichiosis, spotted fever rickettsiosis and tularemia. Rachel Trent, CNN, 12 July 2021 In addition to being the primary carrier of the bacteria that can cause the illness ehrlichiosis, the tick is associated with a red meat allergy known as alpha-gal syndrome. Meredith Deliso, ABC News, 19 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 With a wetter and warmer climate, Lyme disease and ehrlichiosis could become more common as the number of tick bites increase. David Crawshaw, Washington Post, 18 Sep. 2019 The tick population rises in turn, increasing the spread of diseases such as Lyme or ehrlichiosis. Natasha Frost, Quartz, 2 Sep. 2019 Blood testing can help diagnose both anaplasmosis and ehrlichiosis, and both can also be treated with antibiotics. Patia Braithwaite, SELF, 26 July 2019

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'ehrlichiosis.' 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 ehrlichiosis

1965, in the meaning defined above

History and Etymology for ehrlichiosis

New Latin, from Ehrlichia, bacteria genus, from Paul Ehrlich

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The first known use of ehrlichiosis was in 1965

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Last Updated

6 Oct 2021

Cite this Entry

“Ehrlichiosis.” Dictionary, Merriam-Webster, Accessed 4 Dec. 2021.

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More Definitions for ehrlichiosis


ehr·​lich·​i·​o·​sis | \ er-ˌlik-ē-ˈō-sis How to pronounce ehrlichiosis (audio) \
plural ehrlichioses\ -​ˌsēz How to pronounce ehrlichiosis (audio) \

Medical Definition of ehrlichiosis

: infection with or a disease caused by tick-borne bacteria of the genus Ehrlichia that affects both humans and animals (such as dogs, horses, and sheep) and that in humans is marked especially by fever, headache, chills, muscle aches, and fatigue

Note: When ehrlichiosis occurs in humans, the disease is often referred to as human granulocytic ehrlichiosis or human monocytic ehrlichiosis depending on the type of white blood cell (granulocyte or monocyte) infected. Following reclassification of the causative agent of human granulocytic ehrlichiosis to the genus Anaplasma, human granulocytic ehrlichiosis is now also called human granulocytic anaplasmosis or simply, anaplasmosis.


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