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Cats + Zoonotic Diseases

  • Roundworms are one of the most common intestinal parasites observed in cats. They are of most concern to kittens and debilitated older cats when present in large numbers, causing life-threatening problems. Roundworms can also be transmitted to humans. Diagnostic testing, treatment, and preventive measures are explained in this handout.

  • H1N1 influenza virus emerged in pigs as a genetic sharing of DNA from both human and swine influenza viruses. It caused a deadly pandemic in 2009 and continues to be an important cause of illness today. Pets including cats and dogs can be infected from their owners and become ill. It is not yet known to transfer from pets to humans. Good hygiene and restricted exposure should be taken immediately if there is any sign of influenza-like infection to restrict spread between humans, and between humans and their pets or domestic animals.

  • Tapeworms are parasites that infect the gastrointestinal tract of cats, other animals, and humans. Several types of tapeworms are known to infect pets, but the most common species observed in cats is Dipylidium caninum, which is transmitted through fleas. Risk factors, clinical signs, treatment, and prevention are explained in this handout.

  • Ticks are parasites that feed on the blood of their host and can in turn transmit diseases to your cat or even you. They are prolific breeders, and their life cycles can extend through multiple seasons. Prompt removal or use of preventatives limit or prevent the spread of disease or kill the ticks.

  • Toxoplasma occurs worldwide. However, infection is uncommon in pet cats that do little or no hunting and primarily or exclusively eat commercial cat foods. Despite the high number of cats infected with T. gondii, very few show significant clinical signs. Humans are most commonly infected by eating contaminated food. Most people infected with this organism do not develop clinical disease. However, infection during pregnancy may be transmitted to the fetus and sometimes cause severe damage. Many pet cats will never be exposed to Toxoplasma and, therefore, cannot pass the infection on to humans.

  • Tularemia is an infection of the bacteria Francisella tularensis and is most common in rabbits and rodents. Infection in cats occurs from ingestion of an infected animal, drinking contaminated water, or getting bitten by a blood-sucking insect. Clinical signs include enlarged lymph nodes and draining abscesses. Treatment includes antibiotics, surgical removal of any draining abscesses, and any other supportive care warranted by the cat's condition. Tularemia is a reportable zoonotic disease.

  • Vaccines are necessary to reduce illnesses in cats caused by infectious diseases. They work by stimulating the body's immune system to recognize and fight a particular microorganism such as a virus or bacteria. The vaccine helps the body prevent infection or lessen the severity of the infection, and promotes rapid recovery.

  • A zoonosis is a disease or infection that can be transmitted from animals to humans. Although cats only pose a mild risk of causing disease in humans, those with immunosuppressive conditions such as HIV or those receiving chemotherapy are at higher risk of becoming ill from these infections. The most common and significant infections that humans can get from their cats include rabies, cat scratch disease, toxoplasmosis, and ringworm. Feline leukemia virus (FeLV) and feline immunodeficiency virus (FIV) are not zoonotic. Hygiene plays an important role in preventing the spread of these diseases, as well as preventive medicine for your cat, including regular deworming and external parasite preventives. Keep your cat indoors to minimize exposure to zoonotic diseases.