'anaplasmosis' originates from New Latin, specifically from 'Anaplasma' (the genus name) and the suffix '-osis', where 'Anaplasma' refers to the bacterial genus and '-osis' means 'disease condition'.

'anaplasmosis' was coined in the early 20th century as the disease caused by Anaplasma bacteria was identified and named, and 'anaplasmoses' became the plural form in English.

Initially, it meant 'a disease caused by Anaplasma bacteria', and this meaning has remained consistent in modern usage.