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Compassionate, quality petcare since 1947

Compassionate, quality petcare since 1947

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Cats + Parasites

  • Giardiasis is an intestinal infection caused by a microscopic protozoan. The parasites attach themselves to the intestinal wall and the damage causes an acute, sudden onset of foul-smelling diarrhea. Diagnosis may be by routine fecal flotation or presumptively based on clinical signs. Fenbendazole and metronidazole are the drugs most commonly used to kill Giardia. Giardiasis is the most common intestinal parasitic infection of man and can potentially be passed from cats to humans.

  • Harvest mites, also known as red bugs, trombiculid mites, scrub-itch mites, berry bugs or, in their larval stage, as chiggers, are mites commonly found in forests and grasslands. Larval stages affect warm-blooded animals and cause a very itchy skin reaction.

  • Heartworms (Dirofilaria immitis) are blood-borne parasites that reside in the heart or nearby large blood vessels of infected animals. Veterinarians now strongly recommend that all cats receive year-round monthly heartworm preventives.

  • There is no drug approved for treating heartworms in cats and surgical removal is generally the best option. Veterinarians now strongly recommend that all cats receive heartworm preventative.

  • Hookworm is a parasitic infection of the gastrointestinal tract. The parasites have hook-like mouthparts they use to anchor themselves to the lining of the intestinal wall. This handout outlines clinical signs, diagnosis, treatment, and prevention.

  • This handout outlines common internal parasites in cats and what you can do to prevent or treat infection. Included are parasites of the gastrointestinal tract (roundworms, hookworms, and tapeworms), as well as parasites of the circulatory system (heartworms).

  • Platynosomiasis is a disease caused by a parasitic worm called a liver fluke. It affects cats in tropical and subtropical regions. The lifecycle is complex and involves several hosts. Cats can become infected by ingesting lizards or amphibians that have the larval stages of the fluke. The flukes live in the bile ducts and gall bladder of affected cats, causing symptoms of liver disease.

  • Lung flukes are parasitic worms (trematodes) that infect cats’ lungs after they have eaten an infected crayfish or rodents that have eaten infected crayfish. Infected cats can be symptom-free or may develop cough with sometimes bloody mucus, pneumonia, pneumothorax, lethargy and weakness.

  • Lungworm infection is caused by one of several parasitic roundworms. Cats can get a lungworm infection by swallowing infective stages of parasitic lungworm. The exact way that a cat is infected varies according to the life cycle of the parasite. This handout outlines the signs, diagnosis, and treatment for lungworm in cats.

  • Metronidazole (brand name Flagyl®) is used off label in the treatment of certain infections, such as those caused by Giardia and Trichomonas, in dogs, cats, small mammals, birds, reptiles, and other animals. It is often used to treat diarrhea and other intestinal problems.