Causes
The immune system attacks the red blood cells. It can be primary (with no identifiable cause) or secondary to infections (babesiosis, ehrlichiosis), tumours, medicines or toxins.
Diagnosis
A complete blood count showing the anaemia and signs of red blood cell destruction, plus further tests to look for the cause.
Treatment
EMERGENCY: immunosuppressants to halt the destruction, supportive care and, in severe cases, a transfusion. Treat the underlying cause if identified. Requires hospitalisation and close monitoring.
Prevention
Tick control (to prevent the infectious causes), and avoiding inappropriate medicines and toxins.

