Babesia divergens is an intraerythrocytic parasite, transmitted by the tick Ixodes ricinus.

[2] It is the main agent of bovine babesiosis, or "redwater fever", in Europe.

The current emphasis in Europe on sustainable agriculture and extensification is likely to lead to an increase in vector tick populations with increased risk of infection.

[1] B. divergens is also prevalent (infection rates of 11-23%) in cottontail rabbits on Nantucket Island, Massachusetts, USA.

[4] Infections in immunocompetent patients were also observed, and described as a "serious influenza-like" syndrome that requires medical treatment.