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Feline Hemoplasma (Feline Blood Parasite) FAQ — Key Information Every Pet Owner Should Know

Infection/ParasitesQ&AMeongsiljang Veterinary Advisory Board

Feline hemoplasma is a parasite that lives in the blood and can cause anemia and bleeding symptoms. Here’s a summary of key information every pet owner should know.

What is feline hemoplasma?

Hemoplasma parasites that infect red blood cells in cats

Feline hemoplasmas are blood-borne microorganisms (blood parasites) that attach to and parasitize the surface of red blood cells. Mycoplasma haemofelis is a representative pathogen, and it can cause anemia by destroying red blood cells. While transmission is believed to be linked to blood-sucking ectoparasites such as fleas and ticks, the exact natural transmission route in cats has not yet been clearly established. The severity of symptoms varies depending on the degree of anemia, the stage of infection, and the cat’s immune status. While some cases are mild or well-compensated, acute or severe anemia can lead to critical symptoms such as weakness and difficulty breathing.

Why is feline hemoplasma dangerous?

Hemoplasmas destroy red blood cells, leading to anemia. This reduces the blood’s oxygen-carrying capacity, causing fatigue, difficulty breathing, and increased strain on the heart. In some cases, anemia can worsen due to the exacerbation of underlying conditions or co-infection with other pathogens. Since a cat’s susceptibility to infection may be influenced by pre-existing health issues or a weakened immune system, it’s important to consult a veterinarian immediately if you notice any unusual symptoms.

The process by which hemoplasmas destroy red blood cells and cause anemia

What are the main symptoms of hemoplasma infection?

The most common symptom of hemoplasma infection is anemia. Cats may become lethargic, less active, and show pale lips or eyelids. In severe cases, they may experience rapid breathing, an increased heart rate, and even shock. Some cats may also develop fever, loss of appetite, and weight loss. If your cat frequently goes outdoors or has been exposed to fleas or ticks, consider the possibility of infection if these symptoms appear.

Cats showing signs of anemia often have pale lips and eyelids.

Symptoms requiring immediate veterinary visit

If your cat suddenly collapses, begins breathing very rapidly, or develops bluish discoloration around the lips or eyelids, seek veterinary care immediately. These signs may indicate a life-threatening crisis due to severe anemia or hemorrhage. Additionally, if your cat exhibits severe shock symptoms—such as low blood pressure, cold extremities, or decreased consciousness—emergency treatment is required. Early diagnosis and intervention significantly improve survival rates, so never ignore these warning signs.

How is it diagnosed?

Hemoplasma infection is confirmed through blood tests. In particular, blood smear tests allow veterinarians to observe parasites attached to the surface of red blood cells. PCR testing is also used, precisely analyzing the parasite's genetic material to determine whether an infection is present. In some cases, additional tests such as assessments of anemia severity or platelet counts may be performed alongside these primary diagnostics. Since accurate diagnosis requires a veterinarian’s expertise, it is essential to have your pet tested if you suspect symptoms.

A veterinarian examining a blood smear under a microscope.

What are the treatment methods?

Treatment for hemoplasma infection centers on antibiotic therapy. Antibiotics effective at suppressing or eliminating the parasites attached to red blood cells are used, with doxycycline being the primary choice. The duration of treatment is determined by the clinical condition and response, and consistent administration over a set period is typically required. In cases of severe anemia, blood transfusions may be necessary to rapidly restore oxygen-carrying capacity. If the immune response becomes excessively activated, additional treatments may be considered, though this requires professional veterinary judgment. During treatment, closely monitor your cat’s appetite, activity level, and weight changes, confirm treatment efficacy through regular blood tests, and strictly follow your veterinarian’s instructions to maximize the chances of a full recovery.

A veterinarian administering antibiotics to a cat

Comparison of symptoms and responses by infection stage

Item	Main Symptoms	How to Respond
Mild	Slight fatigue, pale lips	Regular blood tests and flea/tick prevention
Moderate	Decreased activity, reduced appetite, rapid breathing	Start antibiotic treatment, veterinary consultation and monitoring
Severe	Shock symptoms, decreased consciousness, severe anemia	Emergency blood transfusion and aggressive antibiotic treatment, hospitalized observation

The treatment direction changes depending on the stage of infection, so early detection and appropriate diagnosis are important.

How can it be prevented?

Preventing hemoplasma infection hinges on flea and tick control. Use a monthly flea and tick preventive consistently, and carefully check your cat’s body after every outing. Even indoor cats can be exposed to fleas, so prevention is essential. Additionally, support your cat’s immune system by feeding a balanced diet and providing a low-stress environment. Prevention is far more effective than treatment.

Applying flea and tick preventive medication to a cat

Points to note: Contraindications during treatment

While your cat is taking antibiotics, they may experience vomiting, diarrhea, or a loss of appetite. If you notice any of these symptoms, contact your veterinarian immediately. Additionally, antibiotics can interact with other medications, so be sure to inform your vet about any other drugs your cat is currently taking. For your cat’s safety, keep a daily log of their condition during treatment and maintain regular communication with your veterinarian.

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 feline hemoplasma be transmitted to humans?

No, feline hemoplasma is not transmitted to humans. It is a parasite specific to cats.

If I have an infected cat, can my other cats get infected too?

Yes, it can be transmitted through flea or tick bites, or via blood transfusions from infected animals. However, the risk of direct transmission through simple contact, such as mutual grooming, is considered low. Therefore, it is important to use preventive medication for all cats while also managing vectors like fleas and ticks.

What is the likelihood of reinfection after treatment?

Since reinfection is possible after treatment, ongoing preventive care is essential. It’s best to minimize exposure to fleas and ticks and regularly check your pet’s condition.

When is the best time to get tested for hemoplasma?

If your cat goes outdoors frequently or has frequent exposure to fleas and ticks, we recommend regular blood tests. It’s also a good idea to have them tested promptly if you notice any unusual symptoms.

How long does the treatment period last?

The duration of treatment may vary depending on your cat’s condition and response. Antibiotics should be administered for the full prescribed period as clinically indicated; stopping treatment early can increase the risk of recurrence.

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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] Weiss D. Nonregenerative anemias. In: Bonagura J, Twedt D, eds. Kirk’s Current Veterinary Therapeutics. 14th ed. Elsevier; 2013.