Updated September 3, 2021
Many of our cat-owning clients will already know how much we hate the name ‘cat flu’. The name comes from a time when we didn’t fully understand what these viruses were. These are serious diseases with often lifelong consequences for the infected cat. Here are the stories of four such cats: Felix, Sooty, Princess and Twitch.
Limping Kitten Syndrome
Felix is a kitten from the Animal Welfare League, which means he has had a better than average start to life. He was sold having had a vet checkup, his desexing operation, a microchip, worming, flea control and the first F3 vaccination.
It wasn’t long before his new owners noticed something was wrong. He wasn’t playing or moving like when he first came home, and he started eating less and losing weight. His owner, who was a doctor commented that he looked like he had reactive arthritis.
He was quite right. When we examined Felix, he had a fever, signs of malnutrition from a poor appetite, and multiple swollen and painful joints. He could barely walk and only did so in a grossly stilted gait as if every joint in his body were painful, which they probably were. He also had that classic sign of a sick cat; the staring coat, which is what we call a clumped, dull and ungroomed coat.
This pattern of signs and symptoms is characteristic of Limping Kitten Syndrome, which is arthritis caused by Feline Calicivirus, one of the ‘cat flu’ viruses.
The video shows him well on the road to recovery, looking well and almost walking normally. He will stay on anti-inflammatory treatment until he no longer has joint pain, and apart from being a calicivirus carrier (see below), should live a normal life.
Sooty and Princess are the sole survivors of a very unlucky start to life. They were born to a mother infected with feline herpesvirus, the other cat flu virus. Although the mother did not appear to be sick, she passed the infection on to all her kittens. When this happens, the virus as it spreads causes a range of disease depending on the age of the foetus or kitten.
The older foetuses can probably survive the infection but are often born with significant damage, whereas the younger foetuses die and are either aborted or stillborn.
Sooty was born with or developed herpesviral neurological disease (we don’t know which as the kittens weren’t seen for the first few weeks). This led to damage to the developing nervous system, giving him the appearance of a human with cerebral palsy. However, he is also generally in poor health and struggles to maintain a healthy weight. At two years of age, even with good care his long-term outlook is guarded at best and his mobility is very poor. Note his size compared with Princess below.
Update 2018: Sooty died suddenly around a year after this blog was written.
Herpesvirus Ulcerative Dermatitis
Twitch was a kitten from a litter just like Sooty and Princess’s. In fact, he’s called Twitch because of the brain damage he suffered. However, apart from being unsteady and uncoordinated, he’s a healthy, happy cat.
Then, all of a sudden he developed a severe facial dermatitis. Painful infected ulceration and crusting appeared on his eyelids, lips and especially the ears. Biopsies showed it to be caused by the same herpesvirus infection that had affected him as a foetus.
He responded extremely well to anti-inflammatory and antibiotic treatment, but we expect he will suffer relapses from time to time.
Gingivitis & Stomatitis
Princess was luckier. She was probably infected later than Sooty. Therefore she was able to fight the infection better and is generally healthy.
Her problem has been one that happens to many cats who recover from cat flu. They become carriers of the virus, and for reasons we don’t fully understand, it causes severe and persistent oral inflammation and ulceration. These cats suffer from painful gingivitis and stomatitis (mouth inflammation), progressing to periodontitis. In Princess’ case, she was in severe pain from infection and loose teeth.
In these situations, it is often necessary to remove all the teeth behind the canines. As shocking as this may seem, it usually results in a cure to the mouth problems and pain. Other treatments for stomatitis can be found here.
We are always asked, “How will they eat with no teeth?” The simple answer is that their mouth is so painful from the infection that they always eat a lot better afterwards. Most cat food really doesn’t require teeth anyway!
We are happy to report that since Princess’ teeth have been removed, the gums have healed and she no longer has mouth ulcers or pain. That’s her mouth above. Click here for other causes of mouth ulcers.
What Is Cat Flu Anyway?
These manifestation of calicivirus and herpesvirus infection are unusual. Follow this link to read about the common symptoms of cat flu.
It’s important to remember that in protecting your cat, these viruses are highly contagious. Many stray cats are shedding the virus, and any shared objects such as rubbing posts or water bowls as well as hands and clothing can spread the disease. Vaccination is the safest form of prevention, and over time it has dramatically reduced the number of sick cats we see with these diseases. Read how we prevent these diseases at Cat Vaccination Explained.
Have something to add? Comments are welcome below and will appear within 24 hours.
By Andrew Spanner BVSc(Hons) MVetStud, a vet in Adelaide, Australia. These help topics are from a series regularly posted on email and Twitter. Subscribe via email here to never miss a story! The information provided here is not intended to be used as a substitute for going to the vet. If your pet is unwell, please seek veterinary attention.