Botflies Average Cost

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What are Botflies?

Cats are usually an accidental host that picks up the botfly larvae when exploring near rabbit or rodent dens. Cats that spend a great deal of time outdoors are at a greater risk, and infestation occurs most frequently in the summer. The larvae can be found most commonly under the skin, but can also make their way to the eyes, respiratory system, or central nervous systems where symptoms can become severe and result in death if not treated quickly.

Botflies are a species of non-biting flies found throughout most of North America. The species is especially active in the warmer months of late spring and summer, but can be found for a longer period in warmer climates. The botfly, or Cuterebra, life cycle involves a parasitic larval stage that requires a host animal, usually a rabbit or rodent. The adult fly lays its eggs on surfaces, like grasses and rocks, in and around the living areas of rabbits and rodents. The eggs or young larvae transition to the host animal by transferring onto its fur when it walks past. They then make their way into the host through an opening or orifice. 

Symptoms of Botflies in Cats

Symptoms of the botfly larvae parasite can vary depending on the location of the larvae within the cat’s body. Cutaneous or skin symptoms are the most common form, although the parasite can affect the central nervous system, respiratory system, and the eyes. Nervous system symptoms often begin with nasal discharge or sneezing as the larvae enter through these orifices. In certain situations, especially when the central nervous system is affected, the symptoms can be severe and even fatal. 

General Symptoms:

  • Fever
  • Lethargy
  • Lack of appetite 

Cutaneous or Skin Symptoms:

  • Lesion or draining sore
  • Lump under the skin or “warble”
  • Excessive grooming of specific site

Respiratory Symptoms:

  • Cough
  • Sneezing
  • Gagging
  • Nasal discharge
  • Trouble breathing

Ophthalmomyiasis or Eye Symptoms:

  • Lesions
  • Facial paralysis
  • Blindness

Nervous System Symptoms:

  • Abnormal behavior
  • Head pressing
  • Disorientation 
  • Head tilt
  • Abnormal vocalization
  • Circling
  • Abnormal gait
  • Lack of reflexes
  • Seizures
  • Paralysis

Causes of Botflies in Cats

Exposure to botfly eggs or larvae usually occurs outdoors in areas where rodents or rabbits make their homes. Physical contact is required for the parasite to infest its host. Cats come into contact with the eggs or larvae in these areas, and it is transferred to their fur from grass, leaves, or other surfaces. It is possible for a cat to bring the larvae into the home, infesting other cats or companion animals. Symptoms are caused by the movement of the larvae within your pet’s bodily systems and the effect it has on surrounding tissues as it begins to grow.

Diagnosis of Botflies in Cats

A physical examination is often sufficient for identifying cuterebrosis, in which case the parasite has reached the stage where it has settled under the skin. The veterinarian will locate the cyst or warble on your cat’s skin and evaluate it for larval infection. Be prepared to discuss your pet’s medical history and advise your veterinarian if the cat spends time outdoors. If the parasite is in the eye, it is also fairly simple to diagnose through observation. Testing may be necessary to confirm parasite is from the botfly and not another parasitic or bacterial infection. To test for Cuterebra larva, analysis of blood, urine, and discharged fluid is required. Identifying parasite-produced toxins in bodily fluids will help to confirm the diagnosis. Testing of cerebrospinal fluid may also be necessary, especially if neurological symptoms are present. Imaging technologies, like an MRI or CT scan, may also help veterinary staff to identify Cuterebra in the central nervous system. 

Treatment of Botflies in Cats

Treatments will vary depending on your pet’s symptoms, their severity, and the location of the parasite. Medical treatment is required, and is usually effective, especially if cuterebrosis is caught early. Do not attempt to treat your cat at home, even if the larvae or warble is visible. There is a high risk of rupturing the cyst or larvae and causing an infection or introducing toxins into your pet’s bloodstream. When found near the skin, the prognosis after treatment is good. Larvae in the eyes or nervous system are more difficult to treat. Treatment options your veterinarian might use include:

  • Extraction: If the larvae have made their home under the skin, the veterinarian will extract it. This is not a surgical procedure, so your pet will not need to be put under. A local anesthetic is used to numb the area, and then an incision is made so the larvae can be removed. Your veterinarian will take care to remove the entire parasite intact to prevent complications associated with rupturing or leaving behind a portion of the larvae. 
  • Surgery: If the larvae are not as easy to reach, a surgical procedure may be required to remove it. Surgery puts your pet at a higher risk of side effects than extraction does. Your pet will undergo anesthesia, will require intravenous fluids, and may need a longer recovery time. 
  • Antiparasitic: This type of medication is used to kill parasites throughout your pet’s body. It may be used in conjunction with extraction or surgical methods, but can also be used alone. It is often used to treat botfly parasites that are in the respiratory, nervous, and other systems where removal is not an option. 
  • Corticosteroids: This type of medication is used to suppress immune reactions and aid in keeping inflammation under control. Corticosteroids treat symptoms in the respiratory and nervous system, are not effective for removing or destroying the parasite.
  • Antibiotics: This type of medication will be administered if an infection is present either at the larval site or in other parts of the body the parasite moved through. Antibiotics are only necessary if bacteria are present. 

Recovery of Botflies in Cats

If the cuterebra larvae are successfully removed, the prognosis is generally good. The lesion or wound site where the larva was removed may take some time to heal. Monitor the area for signs of infection and make another appointment to have the wound checked if it seems to be swelling, draining pus, or spreading. Cats that experience eye infestations could lose sight in the affected eye. Your pet will still be able to lead a full life even after losing their vision. For cats suffering from nervous system symptoms, recovery may be less certain. Damage to the brain or other parts of the nervous system could be permanent or even fatal. Treatment should help, but your pet may not make a full recovery. Take care to support your pet during recovery and avoid stressors or making changes to their living environment.

Botflies Questions and Advice from Veterinary Professionals

7 Months
Mild condition
0 found helpful
Mild condition

Has Symptoms


Bot fly was removed. The area is slightly puss and have been using peroxide to try to keep it clean.the larva is removed (fell out on its own) kitten is in no pain at all. Still eats and acts like its self.
Area is located on the lower stomach area. (Next to the penis area)

Dr. Michele King, DVM
Dr. Michele King, DVM
479 Recommendations
Thank you for your email. If the wound on Jynx isn't improving, and is still producing pus material, he may need antibiotics to help the wound heal. Botfly larva can leave significant wounds, and he may need veterinary care to help it resolve. It it doesn't look like it is healing normally, it would be a good idea to have him seen by a veterinarian, as they can assess the area and see if medications might help. I hope that everything goes well for him.

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4 Years
Mild condition
0 found helpful
Mild condition

Has Symptoms

Open Wound With Pus
Botfly breathing hole
lack of appetite

Found my outdoor cat earlier today with a foul smelling tan liquid around neck. Cleaned around the area. Found a red mark on skin and a botfly breathing hole (which I recognized from having a cat years ago with a botfly infection). Poured liquid down the breathing hole to see if a worm was still there (which is what the vet last time told me to do when they couldn't remove it themselves without surgery). Haven't seen any signs of a worm rising or liquid being pushed back up. So with this information I believe there was a worm had burst from the warble outside (found signs of liquid and blood outside). My question is how much do I need to worry about possible toxins in the bloodstream? I have cut away hair around the wound, cleaned the area around wound, and sprayed him with anti-septic spray for cats. It is currently not producing any more pus. I know signs for infection and will be monitoring him. What signs should I look for possible blood toxin? Currently I am snowed in and cannot leave for a vet so want to do whatever is best in this situation.

Dr. Michele King, DVM
Dr. Michele King, DVM
479 Recommendations
Thank you for your email. While it would be best to have Napoleon seen by your veterinarian, if your cat remains bright and happy, eating and drinking normally, and comfortable, the botfly larva isn't an emergency, just quite esthetically unpleasing. As soon as you can get him in to your veterinarian, it would be a good idea to do so. I hope that everything goes well with him.

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Orange tabby
6 Years
Mild condition
0 found helpful
Mild condition

Has Symptoms

Raised opening with larva showing
Warbles, Raised opening with a larva

What is the risk of re-infestation after the larvae are removed/killed? Do they lay eggs similar to fleas? Is there a chance of a different type of larval infestation other than bot flies? Is it possible for the cat not to suffer any adverse effects from 2 warbles? Can they end up going away on their own?

Dr. Michele King, DVM
Dr. Michele King, DVM
479 Recommendations
Thank you for your email. I'm not sure of the details of your questions. Bot files typically lay their larva and hatch in an appropriate host, so if the flies are controlled, the larvae don't tend to be a problem, but the larvae are quite large, and if Oscar has been affected, he may need treatment for the wounds that they leave. If you are not sure, it would be best to see your veterinarian to make sure that he doesn't have a problem.

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Maine Coon
7 Years
Serious condition
0 found helpful
Serious condition

Has Symptoms

Sleeping in odd places
Loss of Appetite
Constant meowing
Overgrooming area
Shaking his head
Large firm squishy pus sac
Loss of appetite l

His infection had opened up and drained but stayed open and bleeding. I cleaned and treated it with saline, it scabbed over, now it’s infected twice as bad abd twice as big and down along his neck, before it was on top of his head. He seems miserable and my budget is tight. What do you recommend I do?

Dr. Michele King, DVM
Dr. Michele King, DVM
479 Recommendations
Thank you for contacting us about Toothless. That sounds like a terrible infection. He will probably need antibiotics for it to get better. Without antibiotics, there is the risk of sepsis, organ failure, and death, if the infection keeps progressing - it would definitely be best for him to see a veterinarian. There are low cost clinics in different areas that you may be able to find, or some clinics offer a 'free first visit' that you might be able to take advantage of.

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