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Cats + Infectious Diseases

  • Rabies is a devastating viral disease that affects mammals, including cats and humans, and is caused by the rabies virus. Once clinical signs of rabies occur, the disease is nearly always fatal. Vaccination is the cornerstone of rabies prevention.

  • Ringworm infections in cats are caused by a fungus, not a worm. Ringworm is highly contagious and can be spread between animals and from animals to people. The clinical signs, diagnosis, treatment, and risks are explained in this handout.

  • 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.

  • Selamectin + and sarolaner (Revolution Plus®) is used in cats 8 weeks and older to prevent heartworms and intestinal parasites (hookworms and roundworms), kill and prevent fleas, ticks and to control ear mites. It may also be used off label (extra label) “off-label” for the treatment of treat Demodex mites (demodicosis) in cats. Drug sensitivities can develop over time, with repeated exposure. It is important to watch for signs of an allergic reaction over the entire course of treatment and notify your veterinarian if you have any concerns.

  • 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.

  • Tetanus is a medical condition caused by a toxin. This toxin affects the nerves, spinal cord, and brain, leading to hyperexcitability resulting in muscle spasms. Cats are less susceptible to the effects of tetanus toxin than humans and horses.

  • 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.

  • Uveitis is an inflammation of one or more of the structures making up the uvea (part of the eye). Signs of uveitis are severe pain with an intense reddening of the visible parts of the eye. Measurement of intraocular pressure is often performed to diagnose uveitis. Treatment involves reducing the pain and inflammation in the eye as well as treating the initial cause of the disease.