Piroplasmosis

Definition

A malaria-like disease of mammals caused by intraerythrocytic protozoan parasites in the order Piroplasmida (phylum Apicomplexa), especially Babesia and Theileria species, transmitted primarily by hard ticks (Ixodidae). In humans the condition is usually termed babesiosis; in cattle it manifests as Texas cattle fever or redwater, characterized by hemolysis, fever, and hemoglobinuria. The disease exemplifies vector-borne zoonosis at the intersection of acarology, veterinary medicine, and wildlife ecology.

Etymology

From New Latin Piroplasma (former genus name, from Greek pyr 'fire' + plasma 'something formed') + -osis 'disease condition'

Example

Ixodes scapularis ticks transmit Babesia microti to humans in the northeastern United States, often co-infecting with Borrelia burgdorferi (Lyme disease agent) and creating diagnostic complexity.

Synonyms

• Babesiosis

Related Terms

• Babesia
• Theileria
• tick-borne disease
• vector-borne zoonosis
• Texas cattle fever
• redwater
• apicomplexan
• hemolysis

Usage Notes

Specialists distinguish piroplasmosis (broad, including veterinary contexts) from babesiosis (often reserved for human disease). The term is sometimes restricted to non-human infections, though usage varies regionally. Co-infection with other tick-borne pathogens is common and clinically significant.