Parasites of Cats
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Questions and Answers

What is the primary mode of transmission for Aelurostrongylus in cats?

  • Direct contact with infected cats
  • Inhalation of airborne larvae
  • Contact with contaminated water sources
  • Ingestion of infected snails or slugs (correct)
  • What is a common clinical sign associated with Dirofilaria immitis infections in cats?

  • Vomiting
  • Diarrhea
  • Neurological issues
  • Severe respiratory disease (correct)
  • Which diagnostic method is less commonly used to detect Aelurostrongylus?

  • Physical examination
  • Blood smear analysis
  • Baermann technique
  • Fecal flotation (correct)
  • What is a key feature of Dirofilaria immitis in cats compared to other animals?

    <p>Cats are rarely microfilaremic (C)</p> Signup and view all the answers

    What treatment option is NOT recommended for asymptomatic cats infected with Dirofilaria immitis?

    <p>Melarsomine treatment (C)</p> Signup and view all the answers

    What is the primary mode of infection for Platynosomum fastosum in cats?

    <p>Ingestion of pill bugs or paratenic hosts like lizards (D)</p> Signup and view all the answers

    What condition can result from the infection caused by Platynosomum fastosum?

    <p>Acute and chronic cholangitis (C)</p> Signup and view all the answers

    What diagnostic method is used for identifying Cytauxzoon infection in domestic cats?

    <p>Identification of organisms in erythrocytes and macrophages (D)</p> Signup and view all the answers

    Which of the following treatments is recommended for Platynosomum fastosum?

    <p>Fenbendazole, albendazole, praziquantel (C)</p> Signup and view all the answers

    What is a common complication associated with Cytauxzoon infection in cats?

    <p>Occlusion of vessels by macrophages distended with schizonts (D)</p> Signup and view all the answers

    What is a primary consequence of feline ischemic encephalopathy?

    <p>Necrosis and degeneration of superficial layers of the cerebral cortex (C)</p> Signup and view all the answers

    Which of the following statements about Toxoplasma gondii is true?

    <p>Only felids can shed oocysts. (C)</p> Signup and view all the answers

    Which treatment has been utilized successfully in ill cats infected with Toxoplasma gondii?

    <p>Clindamycin (C)</p> Signup and view all the answers

    What organ systems can tachyzoites of Toxoplasma gondii cause granulomatous inflammation in?

    <p>Lymph nodes, heart, liver, lungs, brain, and eyes (A)</p> Signup and view all the answers

    How long do oocysts of Toxoplasma gondii typically shed after initial infection in affected cats?

    <p>1-3 weeks (A)</p> Signup and view all the answers

    Which parasite is primarily responsible for causing mange in cats?

    <p>Notoedres (D)</p> Signup and view all the answers

    What is a potential diagnostic method for identifying Cheyletiella infestation in cats?

    <p>Trichogram (C)</p> Signup and view all the answers

    Which treatment is effective against Notoedres in cats?

    <p>Fipronil (B)</p> Signup and view all the answers

    Which of the following is true regarding the life cycle of Toxocara cati?

    <p>Adult worms live in the small intestine. (B)</p> Signup and view all the answers

    What diagnostic method can be used to identify Toxocara in cats?

    <p>Fecal flotation (A)</p> Signup and view all the answers

    Which of the following medications can be used to treat Toxocara in cats?

    <p>Pyrantel pamoate (A)</p> Signup and view all the answers

    Which statement about Cheyletiella is false?

    <p>It primarily infects dogs. (C)</p> Signup and view all the answers

    What clinical signs are caused by Notoedres infestation in cats?

    <p>Alopecia and hyperkeratosis (B)</p> Signup and view all the answers

    What is a common symptom associated with Ancylostomatoidea infection?

    <p>Respiratory disease and pneumonia (D)</p> Signup and view all the answers

    When should anthelminthic treatment for Ancylostomatoidea typically begin?

    <p>Around 2 weeks of age (C)</p> Signup and view all the answers

    Which of the following hosts are definitive for Spirometra spp.?

    <p>Cats and bobcats (B)</p> Signup and view all the answers

    Which diagnostic method is used for identifying adult Spirometra infections?

    <p>Fecal flotation to identify operculated eggs (D)</p> Signup and view all the answers

    What treatment has been used off-label for Spirometra spp.?

    <p>Praziquantel (A)</p> Signup and view all the answers

    How does the Cuterebra spp. larva typically enter a host?

    <p>Through burrowing into rodent and rabbit holes (A)</p> Signup and view all the answers

    What is a potential site for aberrant migration of Cuterebra spp. larvae?

    <p>Cervical subcutaneous tissue (B)</p> Signup and view all the answers

    Which of the following is NOT a symptom of Ancylostomatoidea infection?

    <p>Severe headaches (C)</p> Signup and view all the answers

    Which statement correctly describes the treatment options for Tritrichomonas blagburni infection in cats?

    <p>No approved treatments exist for Tritrichomonas blagburni infections. (C)</p> Signup and view all the answers

    What can trigger disease in newborn kittens infected with Cystoisospora spp.?

    <p>Change of environment. (C)</p> Signup and view all the answers

    In the diagnosis of Giardia infections in cats, which method is least effective due to intermittent shedding?

    <p>PCR testing. (C)</p> Signup and view all the answers

    What is the primary mode of infection for Ancylostoma tubaeforme in cats?

    <p>Direct ingestion of infective larvae (L3). (D)</p> Signup and view all the answers

    Which of the following species of Cystoisospora is associated specifically with cats?

    <p>Cystoisospora rivolta. (C)</p> Signup and view all the answers

    Which characteristic is true for Giardia infections in cats?

    <p>Assemblage F is the most common associated with cats. (D)</p> Signup and view all the answers

    What is a common clinical outcome of Tritrichomonas blagburni infection in cats under 2 years of age?

    <p>Chronic diarrhea. (B)</p> Signup and view all the answers

    Which of the following is NOT a characteristic of hookworm infections in cats?

    <p>They are transmitted primarily through contaminated food. (C)</p> Signup and view all the answers

    Flashcards

    Notoedres mange in cats

    A skin mite infestation causing mange, characterized by itching, hair loss, and skin thickening. Typically starts on the ears and spreads.

    Cheyletiella mites (walking dandruff)

    Mites that cause skin irritation, visible as flakes or dandruff in cats, and can survive outside the host for a while.

    Toxocara

    A roundworm parasite, a common issue in cats, causing potentially fatal intestinal infections.

    Toxocara cati

    A species of roundworm specific to cats, potentially causing vomiting, diarrhea, and other digestive symptoms in infected cats.

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    Diagnosis of skin mites

    Involves skin scraping to identify the mites; for Cheyletiella, a flea comb or skin scrapings can help diagnose.

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    Diagnosis of roundworms

    Includes examining vomit or feces for adult worms, and fecal flotation to find eggs.

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    Treatment for skin mites

    Can involve macrocyclic lactones or fipronil medications.

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    Treatment for roundworms

    Medication choices include pyrantel pamoate, piperazine, macrocyclic lactones, or emodepside.

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    Tritrichomonas infection in cats

    A common intestinal infection in cats, often asymptomatic, causing chronic diarrhea in younger cats. Diagnosis via fecal smears, and treatment is not typically routine although possible with off-label medicines.

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    Cystoisospora spp. infection in cats

    A common parasitic infection in cats, often causing diarrhea, weight loss and rarely, hemorrhage. Can cause shedding of Toxoplasma. Cats usually recover.

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    Giardia in Cats

    A common intestinal parasite in cats, often subclinical. Diagnose with fecal samples. Often intermittent shedding.

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    Hookworm infection in cats

    A parasitic infection in cats caused by hookworm larvae. Transmission is through ingestion or skin penetration.

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    Ancylostoma tubaeforme

    A hookworm species in cats with three teeth.

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    Ancylostoma braziliense

    A hookworm species infecting dogs and cats, more prevalent in the southern US. It has one tooth.

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    Diagnosis of intestinal parasites

    Tools to diagnose intestinal parasites in cats include fecal smears, culture, PCR tests, and ELISA.

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    Treatment of intestinal parasites in cats

    Treatment of intestinal parasites is often with off-label medications due to a lack of FDA approved ones. These treatments might have side effects.

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    Hookworm disease in cats

    A parasitic infection caused by Ancylostomatoidea hookworms, leading to anemia, diarrhea, and weight loss.

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    Hookworm diagnosis

    Identifying hookworms involves finding thin-walled, oval eggs in a fecal flotation test.

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    Hookworm treatment

    Anthelminthic medication started around 2 weeks of age, such as macrocyclic lactones, pyrantel, or emodepside.

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    Spirometra spp. infection

    Parasitic infection, usually not causing illness in the adult stage. May cause diarrhea, weight loss, or vomiting.

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    Spirometra diagnosis

    Identifying Spirometra involves finding operculated eggs in fecal flotation or sedimentation tests, or seeing worm segments.

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    Cuterebra spp. (botfly) in cats

    Large, dark-brown to black botfly larvae found in subcutaneous tissue, often acquired from rodent burrows.

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    Botfly treatment

    Botfly treatment involves manual removal, topical treatments (imidacloprid or fipronil), or ivermectin.

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    Parasitic differentials for cat cough

    Possible causes of coughing in cats include hookworms, tapeworms, and botflies. Diagnostic tests are needed to confirm.

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    Aelurostrongylus

    A lungworm that infects cats, residing in their lungs as adults. Eggs are deposited in lung tissue, hatch, and larvae are coughed up, swallowed, and develop in snails and slugs. Cats get infected by consuming infected snails/slugs or through paratenic hosts like mice and birds.

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    Dirofilaria immitis

    A type of heartworm that infects cats. Typically, cats only have 1-3 adults and rarely show microfilaria in their blood.

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    Heartworm Associated Respiratory Disease (HARD)

    A condition in cats infected with Dirofilaria immitis. Caused by the death of immature heartworms in the pulmonary vessels, leading to inflammation and symptoms like coughing, wheezing, and difficulty breathing.

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    Diagnosing Dirofilaria immitis in cats

    Diagnosing heartworm in cats is challenging due to low worm burdens. Antigen tests have low sensitivity, antibody tests may not indicate mature adults, and microfilaria are often absent.

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    Paragonimus

    A type of lung fluke that can infect humans and animals, including cats. Paragonimus kellicotti is a specific species found in the United States.

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    Platynosomum fastosum

    A parasitic trematode that infects cats, causing inflammation of the bile and pancreatic ducts.

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    Cytauxzoon

    A fatal protozoan parasite that infects cats, often transmitted by ticks, and causes fever, anemia, and organ damage.

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    How is Platynosomum fastosum transmitted?

    Cats become infected with Platynosomum fastosum by ingesting pill bugs or paratenic hosts like lizards or toads.

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    Signs of Platynosomum fastosum Infection

    Symptoms include lethargy, fever, enlarged liver, abdominal swelling, jaundice, vomiting, and diarrhea.

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    What is the treatment for Cytauxzoon?

    The treatment for Cytauxzoon involves a combination of atovaquone and azithromycin.

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    What is FIE?

    Feline ischemic encephalopathy (FIE) is a condition caused by a blood clot in the middle cerebral artery of the brain in cats. This clot can be caused by migrating parasites or toxins, leading to damage and death of brain tissue.

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    What is Toxoplasma gondii?

    Toxoplasma gondii is a tiny single-celled parasite that infects cats. Only cats can shed oocysts, which are the infectious form of the parasite. The parasite can cause illness in cats, especially those with weakened immune systems, and can lead to inflammation in various organs.

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    How do cats get infected with Toxoplasma gondii?

    Cats get infected with Toxoplasma gondii by eating infected prey, such as mice or birds. The parasite forms oocysts in the cat's intestines, which are shed in the feces. Other animals and humans can get infected by ingesting these oocysts.

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    What are the symptoms of Toxoplasma gondii infection in cats?

    Healthy cats often don't show any symptoms of Toxoplasma gondii infection. However, in immunocompromised cats, the parasite can cause serious illness, including inflammation of the brain, heart, lungs, and other organs.

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    How is Toxoplasma gondii infection in cats treated?

    There is no FDA-approved treatment for Toxoplasma gondii infection in cats. However, veterinarians may use medications like clindamycin, pyrimethamine, or trimethoprim-sulfonamide to treat severe cases.

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    Study Notes

    Parasites of Cats

    • Learning Objectives: By the end of the presentation, learn to identify parasites causing clinical signs in cats, design diagnostic plans, create treatment plans, and educate owners on prevention.

    Notoedres

    • Morphology: Long, unsegmented pedicels; anus on dorsal body surface.
    • Hosts: Cats, rats, rabbits, occasionally humans.
    • Infestation: Starts on pinnae, spreads to face, paws, and hindquarters.
    • Clinical Signs: Alopecia (hair loss) and hyperkeratosis (thickened skin).
    • Diagnosis: Skin scrape.
    • Treatment: Macrocyclic lactones (e.g., ivermectin, milbemycin oxime), fipronil.

    Cheyletiella

    • Common Name: "Walking dandruff."
    • Morphology: Large papal claws, M-shaped peritremes.
    • Hosts: Primarily cats ( Cheyletiella blakei).
    • Infestation: Survives longer off host than other mites, environment can be source of reinfestation.
    • Clinical Signs: Dandruff-like appearance; irritation.
    • Diagnosis: Flea comb, trichogram, superficial skin scrape.
    • Treatment: Macrocyclic lactones, fipronil.

    Toxocara cati

    • Distribution: Worldwide.
    • Morphology: Cream colored adults with cervical alae.
    • Habitat: Adults live in small intestines of mammals.
    • Life cycle is similar to Toxocara canis, with an exception.
    • Transplacental Transmission: Does not occur
    • Transmammary Transmission: Can occur in infected queens.
    • Clinical Signs: Vomiting
    • Diagnosis: Adults in vomit or feces, eggs in fecal flotation.
    • Treatment: Pyrantel pamoate, piperazine, macrocyclic lactones, emodepside.

    Toxocara cati Disease

    • Severity: Less potential for death than T. canis.
    • Zoonotic Potential: Can cause human infection

    Tritrichomonas blagburni

    • Habitat: Large intestine of cats.
    • Prevalence: Common in catteries and purebred cats.
    • Clinical Signs: Chronic diarrhea (commonly in cats less than 2 years old).
    • Asymptomatic: Many cats are asymptomatic.
    • Diagnosis: Trophozoites in fecal smears, InPouch culture, PCR.
    • Treatment: No approved treatments; off-label ronidazole or metronidazole.

    Cystoisospora spp.

    • Transmission: Ingestion of oocysts or paratenic hosts (in dogs and cats).
    • Hosts: Cats (C. felis, C. rivolta).
    • Prevalence: Often results from a change in environment.
    • Clinical Signs: Diarrhea, weight loss (rarely).
    • Diagnosis: Oocysts on fecal smears, or PCR
    • Treatment: Sulfadimethoxine.

    Giardia

    • Description: Common intestinal commensal organism.
    • Clinical Presentation: Many cats are subclinical.
    • Diagnosis: Cysts on direct smears, fecal floatation with zinc sulfate, ELISA.
    • Treatment: Metronidazole (off-label).

    Ancylostoma

    • Transmission: Direct ingestion of infective larvae (L3), skin penetration of L3, or ingestion of paratenic hosts (rodents, cockroaches).
    • Affecting species: Ancylostoma tubaeforme & Ancylostoma braziliense affect cats and dogs.
    • Clinical Signs: Anemia, diarrhea, weight loss, respiratory disease (pneumonia).
    • Diagnosis: Thin-walled, morulated eggs ("strongyle-type") on fecal flotation.
    • Treatment: Anthelminthics (started as soon as possible, around 2 weeks of age); Macrocyclic lactones, pyrantel, emodepside.

    Spirocerca spp.

    • Distribution: Worldwide and most common in Southeast Asia.
    • Hosts: Cat and bobcat are natural definitive hosts.
    • Intermediate Hosts: Plerocercoid (aka sparganum) develops in many animals (snakes, frogs, birds—not in fish).
    • Clinical Signs: Adults in intestines usually cause no disease. Vomiting, weight loss, and diarrhea are possible complications.
    • Diagnosis: Operculated eggs in fecal flotation, or sedimentation, or segments passed in feces.
    • Treatment: No approved treatment; praziquantel may be used off-label

    Cuterebra spp.

    • Transmission: Third-stage larvae acquired from rodent and rabbit burrows.
    • Clinical Signs: Bots found in cervical subcutaneous connective tissue, and migration is sometimes to ocular, nasal, oral regions, and brain regions.
    • Treatment: Manual removal, Topical imidacloprid or fipronil, Ivermectin.

    Aelurostrongylus

    • Habitat: Adults in lungs of cats.
    • Transmission: Eggs are deposited in lung parenchyma, larvae cough up and are swallowed, ingested via snails and slugs.
    • Intermediate hosts: Larvae develop in intermediate hosts (snails & slugs)
    • Clinical Signs: Usually asymptomatic; can cause coughing, anorexia, and dyspnea.
    • Diagnosis: Detection of larvae using Baermann technique or fecal flotations; rarely seen on fecal flotations.
    • Treatment: Ivermectin, selamectin, fenbendazole.

    Dirofilaria immitis

    • Prevalence: Cats typically have 1-3 adult worms.
    • Clinical signs: Asymptomatic to severe, but commonly causes Heartworm associated respiratory disease (HARD).
    • HARD Signs: Intense inflammation of the pulmonary vessels due to immature worm death, and complications such as coughing, wheezing, and dyspnea.
    • Diagnosis: Often difficult; low sensitivity antigen tests, antibody tests, or microfilaria check (may be transient or absent).
    • Treatment: No specific therapy for asymptomatic cats; Melarsomine treatment not recommended; microfilaricidal treatment not required; annual heartworm prevention is recommended.

    Paragonimus

    • Distribution: Present in U.S. around Mississippi River basin.
    • Transmission: Infection through ingestion of metacercariae in crabs or crayfish..
    • Clinical Signs: Chronic coughing; bullae formation and rupture, leading to pneumothorax; migration to viscera and brain.
    • Diagnosis: Fecal sedimentation or transtracheal wash.
    • Treatment: Albendazole, fenbendazole, praziquantel.

    Platynosomum fastosum

    • AKA: Lizard poisoning disease.
    • Habitat: Adults live in bile and pancreatic ducts of cats.
    • Prevalence: Common in southeastern U.S. and Caribbean.
    • Transmission: Ingesting pill bugs or paratenic hosts (lizards, toads).
    • Clinical Signs: Acute/chronic cholangitis, lethargy, fever, hepatomegaly, abdominal distension, jaundice, vomiting, diarrhea, or cholangiocarcinoma.
    • Diagnosis: Eggs in feces on sedimentation.
    • Treatment: Praziquantel, surgical removal

    Cytauxzoon

    • Distribution: Common in US southeast and southern U.S., transmitted by bite of Amblyomma americanum.
    • Clinical Signs: Rapid onset, often fatal; fever, anemia, icterus, pancytopenia, or death.
    • Diagnosis: Organisms in erythrocytes and macrophages.
    • Treatment: Atovaquone + azithromycin.

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