Lungworms in Cats
Written By hannah hollinger
Published: 10/05/2016Updated: 01/20/2022
Veterinary reviewed by Dr. Linda Simon, MVB MRCVS
Lungworms in Cats - Symptoms, Causes, Diagnosis, Treatment, Recovery, Management, Cost
What are Lungworms?
The worms enter the cat by being ingested. Once in the intestines, the worms find the cat’s bloodstream and travel to the lungs. This journey takes approximately 8 or 9 days. The worms mature in the lungs and lay their eggs in lung tissue and airways. After the larvae hatch, they travel up the trachea, where they are swallowed by the cat and flushed through the digestive tract. About 40 days after the initial infection the larvae exit the cat through its feces. While in the lungs, these worms have a tendency to cause infection and damage tissue, primarily in the lower respiratory tract. Veterinary assistance is needed to eradicate a lungworm infestation.
Lungworms are hair-shaped worms that generally range from one to four centimeters in length. The females are significantly longer than the males. Two species of this worm are able to infect cats. Aelurostrongylus abstrusus , also known as Feline Lungworm, is the most common lungworm found in cats. Eucoleus aerophilus (sometimes called Capillaria aerophila) is a lungworm found in both cats and dogs. These worms were at one time thought to rarely affect cats, but after recent study, it is believed over five percent of all cats carry lungworm. 
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Lungworms Average Cost
From 506 quotes ranging from $200 - $500
Average Cost
$250
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Symptoms of Lungworms in Cats
Many cats show no symptoms when infected with lungworms. In young cats, cats with weakened immune systems, and in cases of extreme infestation, the following symptoms may be seen: 
  • Wheezing
  • Coughing
  • Mouth breathing
  • Shortness of breath
  • Bronchitis
  • Tracheitis
  • Bacterial pneumonia
  • Emphysema
  • Nasal discharge
  • Rapid heart rates
  • No interest in play
  • Lethargy
  • Depression
  • Anorexia
  • Emaciation
  • Fever
Causes of Lungworms in Cats
Cats contract lungworm mainly from hunting and exploring outdoors. Adult worms can live for over 9 months in a hospitable environment. Both types of lungworm have different ways of entering the cat.
Aelurostrongylus abstrusus
These worms infect slugs and snails. Cats come in contact with the worms by eating any small animal (birds, rodents, amphibia or reptiles) that feed on affected slugs and snails, or by eating the slugs themselves.
Eucoleus aerophilus  
This type of worm mainly infects earthworms and rodents. The larvae spread from these hosts and live in small water pools. A cat can contract these worms from eating infected rodents or drinking contaminated water. 
Diagnosis of Lungworms in Cats
Upon arrival at your veterinary clinic, the vet will request your cat’s full medical history. Then, a physical exam will be performed. The vet will take note of any symptoms that match signs of lungworm. The most common way to confirm an infection of lungworms is to test the cat’s feces for the presence of larvae. As it takes over a month for the larvae to pass through the cat, sometimes multiple fecal exams may be required. 
In some cases, a tracheal wash may be done to find larvae that have traveled to the trachea from the lungs. X-rays can be done to evaluate the condition of the lungs and to rule out any other causes of lung problems. A bronchoscopy may be used to get a visual on the cat’s airways. Often, the diagnosis may be made after a round of antibiotics has had no effect on the condition of the cat. It is important to note that in the case of kittens, a diagnosis needs to be made fast as the infection can be life-threatening. 
Treatment of Lungworms in Cats
Lungworms can generally be eliminated through extensive treatment with medications. Your veterinarian will recommend the best type for the cat’s specific infection.
Deworming Medication 
Many deworming medications are available for prescription through a veterinarian. To ensure all lungworms are exterminated, often the medication will be needed for up to two months. The treatment must specifically treat lungworm; not all do.
Antibiotics 
If the cat has developed a secondary infection from the lungworms, such as bacterial pneumonia, antibiotics will be prescribed for 2-4 weeks.
Corticosteroids 
If any inflammation has occurred due to lungworm infestation,corticosteroids may be used to decrease it. 

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Recovery of Lungworms in Cats
Most cats make a full recovery from a lungworm infection. Kittens are at a higher risk for developing complications from lungworms that can become life threatening. If secondary infections have progressed, they need to be managed immediately before they become a threat to the cat. 
If at all possible, keep your cat indoors to prevent the possibility of infection. If a cat cannot hunt, the chance of it contracting lungworms is almost nonexistent. Maintain a regular deworming schedule through your vet. Clean the cat’s litter box daily, and disinfect it often. It is rare that lungworm can spread to humans, but not impossible. 
Lungworms Average Cost
From 506 quotes ranging from $200 - $500
Average Cost
$250
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Lungworms Questions and Advice from Veterinary Professionals
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Cockeranian
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Five Years
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8 found this helpful

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8 found this helpful

My pet has the following symptoms:
None
He ate a Slug from outside i am concerned about him being infected by something that could be fatal to him we cleaned out his mouth of the slug but we don’t know if he’ll be ok. We don’t have the money to go to a vet so we would try to stay away from there but if necessary for the health of my dog we will go.
July 18, 2020
Answered by Dr. Michele K. DVM
8 Recommendations
Thank you for your question. Other than being very distasteful to us, slugs are not toxic that I am aware of. I don't think he should have any toxic effects. If he does start to vomit, have diarrhea or becomes lethargic, then it would be a good idea to have him seen by a veterinarian. I hope that all goes well for him!
July 18, 2020
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Shorthair
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Stan
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3 Months
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0 found this helpful

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0 found this helpful

My pet has the following symptoms:
Short Of Breath
Stuffiness
Croup/Cough
I am not sure if my kitten has lungworm, but he has been having some of the symptoms. I have had him to the vet twice in a week. The vet said that his lungs are clear and didn't see any polyps in the throat when he was thought to have had one. He is losing weight. Does anyone have any suggestions. I am desperate. Antibiotics are not helping.
Aug. 30, 2018
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Selkirk Rex
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Chai
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17 Weeks
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0 found this helpful

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0 found this helpful

My pet has the following symptoms:
Constipation
Sleepy
Skinny
Pot Belly
Hi there, Dewormed my kitten (4 months) with drontal tablet (24 hrs ago) and profender topical (3 days ago). She has a significant pot belly but after the topical wormer the fattiness around her spine has disappeared and she now feels quite skinny, her pot belly has remained but potentially decreased in size. I have noticed she is breathing what I would consider quite heavy for a kitten. She seems constipated and has not pooed for over 24hrs. She is eating and drinking normally. She is a Selkirk Rex so I would say she is relatively quiet regardless.
July 18, 2018
Answered by Dr. Michele K. DVM
0 Recommendations
There are some parasites in kittens that are not treated by those medications, and it may be a good idea to have a fecal sample analyzed to make sure that you treated all the parasites that may have been there.
July 18, 2018
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Ivy
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Ivy
dog-age-icon
18 Months
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1 found this helpful

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1 found this helpful

My pet has the following symptoms:
Coughing
My cat is Ivy and she has problems with her respiratory system. She hasn't been able to eat for over a week and she has been coughing terribly. She was given antibiotics but she's not better and she just gave birth to 4kittens. Please what should I do as I don't have money for drip as prescribed by the Vet.
July 9, 2018
Answered by Dr. Michele K. DVM
1 Recommendations
Ivy may need further veterinary care, and there may not be anything that you can do at home, unfortunately. If she cannot eat, she will no be able to survive for very long. Since your veterinarian has seen her, it may be a good idea to call them, let them know that the medications did not help but that you cannot afford the recommended treatment, and see if they have any other less expensive suggestions for Ivy.
July 10, 2018
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Cat
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Ruby and Ike
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2 Years
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2 found this helpful

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2 found this helpful

My pet has the following symptoms:
Worm On Floor
Hi, We have two cats about 21/2 years old. Brother and sister. Never have been outside, always given Revolution on time, fed Science Diet since we got them at 6 weeks, regular trips to the vet. Yet, tonight we found a Lungworm on the floor squirming around. No idea how they could have gotten this but its in a glass jar now. Since they get Revolution how could they have gotten Lungworm?
June 7, 2018
Answered by Dr. Michele K. DVM
2 Recommendations
Are you sure that the parasite that you saw was a lungworm? That is very uncommon, especially in cats that are are well taken care of as yours. I cannot see when they would have come into contact with that parasite. If you can collect the worm in a baggie and take it to your veterinarian, they may be able to ease your mind as far as the type of worm that you have seen. They will also be able to treat it if needed.
June 7, 2018
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Calico
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Katsumi
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9 Months
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0 found this helpful

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My pet has the following symptoms:
Sneezing, Coughing, Nasal Discharge
Our cat Dexter brought a very skinny cat home after hurricane michael. Shes very playful, has an ok appetite. She has been having attacks of coughing and respitory contractions mainly after she eats, but coughs throughout the day. She has a yellowish brown discharge when she sneezes. Shes not lathargic by any means. We though it was just allergies, again for the reason that she has so much energy and plays like a normal kitty.But now uppn reading about catworm, we are convinced this is whats wrong with her. We've noticed before shes able to get up and do anything upon waking up she must let the mucous drain down slowly or she will choke. We dont have $150 for a test to determine if its in fact lung worm. We have around $150 for the visit,check up, and antibiotics. Does this sound like lungworm? And are there suggestions as to what we can do as far as getting her tested and treated within our budget? And can she pass this disease to our other cat? Im assuming yes since its a parasite, if in fact this is what she has!! Her name is Katsumi and she is a very unique cat..she uses her paws as hands and sits on her back two legs all the time as if she were human.she is very sweet and lovable, but she also is a very good hunter. So please any tips would be so appreciated, for not only do we love her, our nuetrted cat Dexter whom brought her home is in love with her as well. Thank you
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Black and white
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Sylvester
dog-age-icon
1 Year
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0 found this helpful

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My pet has the following symptoms:
Vomiting, Wheezing, Extremely Overweight
I have a one yr old male cat, Sylvester, who has had his fair share of issues since birth. As a newborn, the runt, he suffered from a common eye infection that was treated and eventually cured of. As he began to grow over the course of several months, having been fed only soft food and the occasional nursed milk from momma kitty before she weaned him off completely. He refused hard cat food as I tried early on to introduce it into his diet. Until momma finnaly gave up nursing for good, we strickly gave up the soft food as well. While cost are always a concern, the brand of cat food was primarily that affordable (cheaper) drug store brand unfortunately. Around 6 months Sylvesters momma, Mocha, was given to a good home in need, an elderly lady who lost her cat to cancer. The separation took its toll on Sylvester, as he was the chosen one we keep while having found homes for his 5 brothers and sisters several months prior. While we also have 2 other male adult cats, Sylvester grew somewhat depressed. He began to what seemed, rapidly gain weight...more so than a growing kitten would be expected of. Now, at one year, he is seriously a fatty. He vomits on almost a daily basis. And its always shortly after he eats his first meal. This unfortunately was not discovered until recently because we could never figure out which cat exactly was the one getting sick. Yet as of now, and since th last 6 months, Sylvester basically sits around, sleeps, goes out on brief excursions but never for too long, he doesnt constantly eat either, normal appetite rather. Hes always been a wheezer..which concerned me early on. In addition, ever since a kitten, he never sits on all fours...like when you tell a dog a to sit...that position. Instead he always sits in that position it with a tilt in the hip. As if sitting straight up is uncomfortable on his spine or tailbone. I'm worried he has a thyroid issue or something constricting his food passagway.
Lungworms Average Cost
From 506 quotes ranging from $200 - $500
Average Cost
$250
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