What is babesiosis?
Updated By PetymFacts checked against official sources on
Quick answer
Babesiosis is a disease of dogs caused by Babesia, tiny parasites that live in and destroy red blood cells. It is spread mainly by ticks, and in India one species, Babesia gibsoni, also spreads through dog fights and blood transfusions. Signs are anaemia with pale gums, weakness, jaundice and red or brown urine. Dogs that recover can relapse.
Also called canine babesiosis, Babesia, Babesia gibsoni, Babesia vogeli, piroplasmosis.
Key facts
- Babesia vogeli is spread by the brown dog tick; B. gibsoni also spreads through dog fights and blood transfusions. Tropical Council for Companion Animal Parasites
- Signs usually start 1 to 4 weeks after infection; one tropical guideline says up to 6 weeks. Tropical Council for Companion Animal Parasites
- Recovered dogs can stay infected for life and fall ill again, for example when their immune system is weakened. Tropical Council for Companion Animal Parasites
- A literature review found babesiosis and ehrlichiosis endemic throughout India. Parasites & Vectors (2010)study
- Small Babesia species were highly prevalent in dogs studied in Kerala. Veterinary World (2017), KVASUstudy
How do dogs catch babesiosis?
Usually from a tick bite. The brown dog tick carries Babesia vogeli, and B. gibsoni, the small species common in India, is mainly spread by a different tick. B. gibsoni can also pass directly from dog to dog through bite wounds in fights and through blood transfusions, so a dog that gets into fights is at extra risk.
Studies from Punjab in the north-west, Kerala and Andhra Pradesh have detected Babesia in dogs, with small species such as B. gibsoni common in Kerala. Many of these studies sampled stray or clinic dogs, so the figures do not describe pet dogs in general.
What are the signs of babesiosis?
Some dogs fall ill suddenly; others show vague signs for weeks. A blood test is needed to confirm it.
- Pale gums, from anaemia as red blood cells are destroyed. Tropical Council for Companion Animal Parasites
- Weakness, tiredness and reluctance to walk. Tropical Council for Companion Animal Parasites
- With B. gibsoni, a long-running illness with anaemia that gets steadily worse. Merck Veterinary Manual
- Yellow gums or eyes (jaundice). Tropical Council for Companion Animal Parasites
- Red or brown urine. Tropical Council for Companion Animal Parasites
How is babesiosis diagnosed and treated?
A vet looks at a blood smear under the microscope, and may use a PCR test, which the Merck Veterinary Manual notes is more sensitive than the microscope, especially in carrier dogs. Ehrlichiosis and other tick-borne infections often occur at the same time in Indian dogs, so vets may test for several at once.
Treatment uses specific anti-parasite medicines chosen by the vet, with supportive care; badly anaemic dogs may need a blood transfusion. Merck notes that B. gibsoni is not readily treated with the usual anti-Babesia medicines, and recovered dogs can stay infected and relapse later, often under stress or another illness. Follow-up blood tests show how well it is working.
How do you prevent babesiosis?
Prevention rests on year-round tick control with a product licensed for dogs, daily tick checks and quick removal, and treating the home where brown dog ticks breed. Stopping dog fights and screening blood donors for B. gibsoni block the other routes. After a stay away or a trip, keep watching your dog for several weeks.
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Questions owners ask
Is babesiosis the same as tick fever?
- Tick fever is an everyday name in India, not a diagnosis. It usually means babesiosis or ehrlichiosis, the two main tick-borne infections of dogs here, and some dogs have both. Only a blood test tells them apart, and they are treated differently, so see your vet.
Can babesiosis come back in dogs?
- Yes. Dogs that recover can stay infected for life, and the parasites can multiply again when the immune system is weakened, for example by stress, another illness or some medicines. Regular blood checks and strict tick control lower the chance of a relapse.
Can humans get babesiosis from dogs?
- The Merck Veterinary Manual notes that babesiosis as a group is a zoonotic disease that can affect people, mostly through tick bites and blood. Using tick control on your dog, removing ticks with tweezers rather than bare fingers and washing your hands protect you both.
How long after a tick bite does babesiosis show?
- Usually 1 to 4 weeks after infection, and one tropical guideline says up to 6 weeks. That is why owners should keep watching a dog for several weeks after a trip, a stay away or a heavy tick burden, even after the ticks are gone.
Keep reading
Related terms
More in vaccines and parasites
- Booster vaccineA booster is a repeat dose of a vaccine that tops up or confirms a pet's protection. Puppies and kittens get a booster at about 26 weeks after their first course. After that, modern core vaccines for distemper, parvovirus and panleukopenia protect for years, while leptospirosis, kennel cough and most killed vaccines need a booster every year.
- Brown dog tickThe brown dog tick, Rhipicephalus sanguineus, is the most common tick on dogs in the tropics, including India. Unlike most ticks it lives and breeds indoors, in homes and kennels, as well as outdoors. It spreads ehrlichiosis and one form of babesiosis, the infections Indian owners call tick fever, so tick control is needed all year.
- Core vaccinesCore vaccines are the vaccines every dog or cat should have, wherever it lives, because they protect against widespread, serious diseases. For dogs they cover distemper, adenovirus and parvovirus; for cats, panleukopenia, herpesvirus and calicivirus. In India rabies is core for both, and WSAVA also treats leptospirosis vaccine as core for dogs where the disease is endemic.
- DewormingDeworming is giving a pet medicine, chosen by your vet, to kill intestinal worms such as roundworms, hookworms and tapeworms. Puppies can be born with roundworms and catch more from their mother's milk, so deworming starts in the first weeks of life. Some dog and cat worms can infect people, especially children, so regular deworming protects the family too.
- DHPPi vaccineDHPPi is the combined core vaccine for dogs printed on many Indian vaccine cards. The letters stand for distemper (D), hepatitis from canine adenovirus (H), parvovirus (P) and parainfluenza (Pi). DHPPiL adds leptospirosis (L). It is the same vaccine group that US cards call DHPP or DA2PP, and puppies start it at 6 to 8 weeks.
- EhrlichiosisEhrlichiosis is a disease of dogs caused by Ehrlichia canis, a bacterium carried by the brown dog tick. Signs appear 1 to 3 weeks after infection: fever, dullness, bleeding such as nosebleeds or bruising, and enlarged lymph nodes. Some dogs seem to recover but carry the infection silently and later develop a severe chronic form.
- Flea and tick preventionFlea and tick prevention means regularly protecting a pet from these parasites with a product your vet recommends, plus checking the coat and treating the home. Tropical guidelines say dogs and cats in places like India should be protected all year, including indoor pets. Use products licensed for the species, and never put a dog product on a cat.
- FleasFleas are small, wingless, blood-feeding insects. The cat flea, Ctenocephalides felis, is the most common flea on dogs and cats worldwide, and the main flea on dogs studied in India. Fleas cause itching, flea allergy, tapeworm and, in heavy infestations, anaemia in puppies and kittens. Most of the flea life cycle happens in the home.
- FVRCP vaccineFVRCP is the core combined vaccine for cats. It protects against feline viral rhinotracheitis (herpesvirus), calicivirus and panleukopenia. Indian cards often show a brand name from the vial sticker instead, such as Tricat. Kittens start at 6 to 8 weeks, with doses every 2 to 4 weeks until 16 weeks or older, then a booster at about 26 weeks.
- HeartwormHeartworm, Dirofilaria immitis, is a long worm that lives in the heart and lung blood vessels of dogs and, less often, cats. It is spread by mosquito bites and is widespread in tropical regions, including parts of India. Signs include coughing, tiring on exercise and weight loss. It can be prevented, and dogs should be tested yearly.
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Sources
Each source was opened and read on the date shown. How Petym checks its sources
- Tropical Council for Companion Animal Parasites: Canine guidelines: Babesia (opens in a new tab)
- Merck Veterinary Manual: Babesiosis in animals (opens in a new tab)
- Companion Animal Parasite Council: Babesia (dog) (opens in a new tab)
- Merck Veterinary Manual: Blood parasites of dogs (opens in a new tab)
- Parasites & Vectors (2010): Canine vector-borne diseases in India: a review of the literature (opens in a new tab)
- Veterinary World (2017), KVASU: High prevalence of small Babesia species in dogs of Kerala (abstract read) (opens in a new tab)
Show all 12 sourcesShow fewer
- Parasites & Vectors (2016): A review of canine babesiosis: the European perspective (opens in a new tab)
- Animals (2022): Canine babesiosis caused by Babesia gibsoni: etiology, pathogenesis and diagnostics (opens in a new tab)
- Parasites & Vectors (2011): A survey of canine tick-borne diseases in India (opens in a new tab)
- BioMed Research International (2014), GADVASU: Canine babesiosis in northwestern India: molecular detection and risk factors (opens in a new tab)
- Veterinary Research Forum (2023): Co-infections of major tick-borne pathogens of dogs in Andhra Pradesh, South India (opens in a new tab)
- Parasitology International (2026): Molecular epidemiology of tick-borne infections of cattle and dogs in India (abstract read) (opens in a new tab)