Mediterranean theileriosis

Definition

A tick-borne protozoan disease of cattle caused by the apicomplexan parasite Theileria annulata, occurring across the Mediterranean basin, Middle East, and extending to western India and China. The disease is transmitted by ixodid ticks, primarily of the genera Hyalomma and Rhipicephalus, and is characterized by fever, anemia, jaundice, and often fatal outcomes in susceptible animals. The term is used interchangeably with tropical theileriosis, reflecting its historical geographic framing rather than distinct pathology.

Etymology

From the Mediterranean Sea (Latin Mare Mediterraneum, 'sea in the middle of lands') + Theileria (genus of piroplasmid parasites, named for Arnold Theiler) + -osis (disease condition)

Example

Outbreaks of Mediterranean theileriosis in Turkish cattle herds often peak in late spring when Hyalomma marginatum tick activity increases following winter dormancy.

Synonyms

• tropical theileriosis

Related Terms

• Theileria annulata
• Hyalomma
• Rhipicephalus
• tick-borne disease
• Piroplasmosis
• Theileriosis
• vector-borne pathogen
• apicomplexan parasite

Usage Notes

Specialists use 'Mediterranean' and 'tropical' theileriosis as synonyms for the same disease caused by T. annulata; the geographic labels reflect historical distribution patterns rather than climatic requirements of the parasite. Distinguish from East Coast fever (caused by Theileria parva) in African cattle. Control efforts target both the tick vector (acaricides, pasture management) and the parasite (attenuated-cell vaccines).