Feline babesiosis
Also called Babesia felis infection
A tick-borne infection of red blood cells that is uncommon in cats but reported in parts of Africa and India. It causes anaemia, weakness and loss of appetite.
Cause and spread
- Cause
- Babesia parasites, mainly Babesia felis.
- How it spreads
- By ticks.
Signs to watch for
- Weakness, lethargy and loss of appetite
- Pale or yellow gums from anaemia
- Fever in some cats
- Weight loss
Many diseases look alike. Only a laboratory test can tell them apart, so please see a veterinarian for any sick animal.
How it is diagnosed
A stained blood smear and a blood count show the parasite and the anaemia. PCR confirms the species.
- Usually the first testComplete Blood Count (CBC)Shows anaemia.
- Usually the first testBlood Smear ExaminationLooks for the parasite in red blood cells.
- Usually the first testBasic Haemoparasite Panel (CBC + Blood Smear) (panel)Blood count and blood smear together.
- Confirms the diseaseBabesia felis PCRDetects Babesia felis.
Prevention and control
- Ask your veterinarian for tick control that is safe for cats
- Check cats that go outdoors for ticks
Where this information comes from
- Babesiosis in Cats · Merck Veterinary Manual
- Babesiosis in Animals · Merck Veterinary Manual
General information for animal owners and veterinarians, last checked October 2026. It does not replace the advice of your veterinarian, who should decide which tests and treatment your animal needs.