고양이 헤모플라스마(고양이 혈액기생충) 증상과 원인, 진단·치료와 관리 포인트 총정리

Feline Hemoplasma (Feline Blood Parasite): Symptoms, Causes, Diagnosis, Treatment, and Management Essentials

Infection/ParasitesDiseasesMeongsiljang Veterinary Advisory Board

Feline hemoplasma is a blood parasite that attacks red blood cells in cats, potentially causing anemia and bleeding symptoms. Early diagnosis and appropriate treatment are essential.

What is Feline Hemoplasma?

A veterinarian drawing a blood sample from a cat.

Feline hemoplasmas are blood-borne parasites that attach to the surface of red blood cells in cats, causing anemia (also known as feline infectious anemia). These parasites primarily appear as *Mycoplasma haemofelis* and *M. haemominutum*, the latter having lower pathogenicity, and can be identified on blood smears from infected cats as organisms adhering to red blood cell surfaces. Cats that go outdoors are at higher risk of infection. While the exact natural routes of transmission remain unclear, spread via blood-feeding ectoparasites such as fleas and ticks, as well as transmission through blood transfusions from carrier cats, is well documented. Simple contact like mutual grooming is considered unlikely to transmit the infection, whereas wounds from biting or scratching during fights can serve as transmission routes. Early detection is crucial, so regularly monitoring your cat’s health is essential.

What are the Main Causes of Hemoplasma Infection?

The primary cause of feline hemoplasma infection is transmission through blood-sucking vectors such as fleas, ticks, and lice. Cats that go outdoors are at a higher risk of infection. Additionally, direct transmission through wounds caused by bites or scratches during fights between cats is also known to occur. Older cats, those with weakened immune systems, and particularly male non-purebred cats are more frequently associated with infection. However, since the natural transmission routes of hemoplasma are not yet fully understood, it is advisable to pay extra attention to preventive measures such as flea control and regular veterinary checkups, especially in multi-cat households.

Several cats playing indoors, with one cat having a flea on it

Check for Key Symptoms and Signs

The main symptoms of feline hemoplasma infection include the following:

Anemia: Pale skin and mucous membranes, along with a sudden drop in activity levels.

Fatigue: The cat may sleep most of the day or remain inactive for long periods.

Loss of appetite: Refusal to eat treats or regular food, or consuming only small amounts.

Difficulty breathing: Rapid or labored breathing may be observed.

Splenomegaly and jaundice: Enlargement of the spleen is common due to red blood cell destruction, while jaundice is relatively rare. Additionally, fever may recur during periods when parasite levels fluctuate.

If you notice any of these symptoms, consult your veterinarian immediately. Early diagnosis significantly improves treatment outcomes.

Pale mucous membranes visible inside a cat’s mouth

Symptoms Requiring Immediate Veterinary Visit

If your cat is experiencing severe difficulty breathing, blood in the urine, sudden shock, or loss of consciousness, seek veterinary care immediately. These signs may indicate severe anemia or active bleeding, which can be life-threatening. In particular, if your cat is unable to move, has cloudy eyes, or loses balance, treat it as an emergency.

Diagnostic Tests for Accurate Diagnosis

Diagnosing a Hemoplasma infection requires blood tests. Veterinarians typically examine blood smears to check for parasites attached to red blood cells. PCR testing can also accurately detect the parasite's genetic material. In addition to these specific tests, veterinarians evaluate complete blood counts, hemoglobin levels, and platelet counts to assess the severity of anemia and the risk of bleeding. These diagnostic procedures performed by your veterinarian ensure an accurate diagnosis.

A veterinarian examining a blood smear under a microscope

Treatment Methods and Step-by-Step Management

Treatment for Hemoplasma infection primarily involves antibiotics. The first-line drug of choice is doxycycline, which is typically administered once daily for approximately four weeks (28 days). If doxycycline is not suitable or if the response is inadequate, alternative antibiotics such as enrofloxacin may be considered. In cases of severe anemia, blood transfusions may be necessary. Additionally, because Hemoplasma infection can be associated with immune-mediated hemolysis, immunosuppressive agents may be used as adjunctive therapy to prevent the immune system from excessively destroying red blood cells. Throughout treatment, it is essential to closely monitor the cat’s condition and ensure that medication is not discontinued prematurely. After treatment, preventive care remains important to help prevent reinfection.

A veterinarian administering an intravenous injection to a cat

Home Care and Prevention Tips

Proper home care is essential for cats undergoing treatment.

Consistent medication administration: Antibiotics must be taken for the full prescribed duration. Do not stop early, and administer the exact dosage at the correct times.

Nutritional support: Anemia can suppress appetite, so choose a high-calorie, easily digestible diet.

Adequate rest: Limit physical activity and provide a quiet environment for rest.

Preventing reinfection: Use flea and tick preventatives regularly, and check your cat’s body after any outdoor exposure.

Regular check-ups: Even after treatment, monitor recovery with blood tests every 1 to 2 months.

A cat resting comfortably on its bed while eating food.

Breed-Specific Considerations and Recurrence Prevention

There is no clear evidence that symptoms worsen more severely in certain breeds after infection. The severity of symptoms depends on how severe the anemia is, the stage of the infection, and the cat’s immune status. There is also no evidence linking Persian cats specifically to blood clotting disorders. After infection, the immune system may weaken, increasing the risk of reinfection, so ongoing flea and tick prevention is essential. If your cat goes outdoors, be sure to use preventive medication and keep the home environment clean.

Reviewed by a veterinarian

Dr. Tony — Punnawat Phongkittirak

Veterinarian

A veterinarian who majored in veterinary medicine at Khon Kaen University, Thailand, and completed the IVSA program at North Carolina State University in the United States. Drawing on clinical experience at animal hospitals, he works in the pet healthcare field and is dedicated to building a digital care environment that connects pet parents with veterinarians.

Frequently Asked Questions

Can hemoplasma infections be transmitted to humans?

There is no evidence to suggest that feline hemoplasma is transmitted to humans. However, if you have a weakened immune system, it’s a good idea to be extra diligent about your pet’s hygiene.

Can other cats living with an infected cat also become infected?

While the risk of transmission through simple contact like mutual grooming is considered low, the condition can spread if cats share fleas or develop wounds from fighting. Therefore, other cats living with an infected cat also require testing and preventive care.

Can my pet get reinfected even after treatment?

Yes, if your pet's immune system is weak or preventive care has been inadequate, there is a risk of reinfection. Consistent flea and tick prevention is essential.

My cat has no appetite while taking antibiotics. What should I do?

Antibiotics like doxycycline can cause gastrointestinal side effects such as loss of appetite, vomiting, and diarrhea. Consult your veterinarian about adjusting the medication or using supportive supplements. Avoid force-feeding and try offering more palatable food instead.

My pet’s blood test results came back negative, but the symptoms are still persisting. Why is that?

Hemoplasmas exhibit cyclical fluctuations in the bloodstream, which means they may not always be visible on a blood smear. Because PCR testing or repeated examinations may be necessary, it's best to consult with your veterinarian about additional diagnostic steps.

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References

[1] Viviano KR, Webb JL. Clinical use of cyclosporine as an adjunctive therapy in the management of feline idiopathic pure red cell aplasia. J Feline Med Surg. 2011;13(12):885–895.

[2] Maddison JE, Watson AD, Eade IG, et al. Vitamin K-dependent multifactor coagulopathy in Devon Rex cats. J Am Vet Med Assoc. 1990;197:1495.

[3] Clinical Medicine of the Dog and Cat, 4th Ed. Elsevier, 2020.