By MJ Wixsom, DVM MS MBA
If you’ve ever brought home a kitten and within a week heard sneezing, seen watery eyes, or noticed crust around the nose or eyes, you are definitely not alone. Upper respiratory infections are one of the most common reasons people call a veterinary office about kittens. They can also be frustrating because they often look terrible, linger longer than expected, and spread like wildfire in homes, shelters, and rescues with multiple cats.
When people talk about a “kitten cold,” they’re usually referring to a group of contagious viruses and bacteria that affect the nose, throat, and eyes. The two biggest viral offenders are feline herpesvirus (FHV-1) and feline calicivirus. These infections are extremely common, especially in kittens coming from shelters, rescues, or any crowded environment. Stress, immature immune systems, parasites, poor nutrition, and close housing all make kittens more vulnerable.
The symptoms are usually pretty recognizable. Sneezing is common. Nasal discharge may start clear and become thick or colored over time. Eyes may water, squint, or develop discharge and crusting. Some kittens sound congested or breathe noisily. True coughing is less common than sneezing in cats, but it can happen. One thing owners often notice is a sudden drop in appetite. Cats rely heavily on their sense of smell to eat, so when they’re congested, food simply becomes less appealing.
That loss of appetite is one of the things that worries me most in young kittens. Adult cats have more reserves. Kittens do not. A kitten that stops eating can go downhill quickly. Add in fever, dehydration, or diarrhea, and a mild respiratory infection can suddenly become much more serious. When I examine a kitten with upper respiratory signs, I’m not just looking at the nose and eyes. I’m evaluating hydration, body condition, energy level, weight, and whether the kitten is still eating and drinking.
These infections spread very easily through sneezing, grooming, shared food bowls, litter boxes, and contaminated hands or clothing. If you bring home a sneezing kitten and already have cats at home, it’s safest to assume the new kitten is contagious. Isolation in a separate room, separate bowls, washing your hands between cats, and even changing shirts after handling the sick kitten are all reasonable precautions, especially if you have older cats, young kittens, or medically fragile pets at home. Quarantine should be at least 3 weeks!
Treatment depends on how severe the infection is and what organisms are involved. If the primary problem is viral, antibiotics do not kill the virus itself. However, secondary bacterial infections commonly develop on top of the viral irritation, and antibiotics may still be helpful in those situations. Supportive care is often the most important part of treatment: keeping the kitten warm, hydrated, and eating.
Simple things at home can help. Sitting with the kitten in a steamy bathroom after a hot shower may help loosen congestion. Gently wiping away eye and nose discharge with a warm damp cloth can keep them more comfortable. Warming canned food or offering strong-smelling foods may encourage eating. In more severe cases we sometimes use appetite stimulants, eye medications, fluids, nebulization treatments, or other supportive care. If mouth ulcers develop, which can happen with calicivirus, pain control becomes important because a painful mouth can stop a kitten from eating entirely.
Feline herpesvirus deserves special mention because it doesn’t always behave like a simple cold. Herpesvirus can become dormant in the body after the initial infection. A cat may recover completely and appear healthy for months or years, then flare up again during times of stress or illness. That’s why some cats seem to get recurring “kitty colds” throughout their lives. Calicivirus can also vary widely in severity. Some strains are mild, while others cause significant oral ulcers and discomfort. Fortunately, vaccination helps reduce severity and gives kittens much better protection as their immune systems mature.
While we’re discussing kitten viruses, there are three other diseases every cat owner should recognize by name: feline leukemia virus (FeLV), feline immunodeficiency virus (FIV), and panleukopenia.
Feline leukemia virus is not simply “cancer,” although it can lead to cancer and immune suppression. It spreads mainly through close contact and saliva, especially among kittens and young cats. Some cats exposed to FeLV clear the infection, while others become persistently infected. FeLV-positive cats can sometimes live for years with good care, but they are more vulnerable to infections and other serious illnesses. This is one reason testing new cats before introducing them into a household is so important.
Feline immunodeficiency virus, or FIV, is sometimes casually called “feline AIDS,” but that term can create unnecessary fear. FIV affects the immune system, but it is not spread easily through casual contact like sharing bowls or grooming. The most common transmission is through deep bite wounds, which is why intact roaming male cats are at highest risk. Many FIV-positive cats can still live long, comfortable lives indoors with regular veterinary care. A positive test is not an automatic death sentence, and it should not be treated as one.
Panleukopenia, however, is the disease that truly scares me in kittens. Also called feline distemper, it is caused by a parvovirus and can be devastating. It attacks rapidly dividing cells in the intestinal tract and bone marrow, leading to severe vomiting, diarrhea, dehydration, and dangerously low white blood cell counts. It is highly contagious, extremely hardy in the environment, and often fatal in young kittens without aggressive treatment. The encouraging part is that vaccination is very effective against panleukopenia, which is exactly why staying current on kitten vaccines matters so much.
All of these diseases connect back to the “kitten cold” conversation because not every sneezing kitten has a simple viral infection. Some kittens develop pneumonia. Some have severe eye infections that can permanently damage the cornea. Others may have underlying immune problems, parasites, poor nutrition, or concurrent viral diseases that make respiratory infections much more severe.
Good preventive care goes a long way. Vaccination, parasite control, proper nutrition, minimizing stress, and limiting exposure to unknown cats are not just boxes to check off during a vet visit. They are some of the most important tools we have to keep kittens healthy and thriving.
If you’re adopting a kitten, ask what vaccines have already been given and when boosters are due. Kittens need a series of vaccines, not just one shot. Ask whether the kitten has been tested for FeLV and FIV. Ask what deworming has been done and what food the kitten is currently eating. And if your new kitten starts sneezing shortly after you bring them home, don’t immediately assume you did something wrong. Many kittens were exposed long before they ever met you. The important thing is responding early, keeping them hydrated and eating, and seeking veterinary care if symptoms worsen or persist.
And finally, a little practical news from our clinic: we still have three kittens available for adoption. They have been neutered, tested negative for FeLV and FIV, dewormed, and have their vaccines started. If you’ve been thinking about adding a kitten to your family, adopting one that already has this medical groundwork completed is a wonderful way to start off on the right foot. And they are cute.
MJ Wixsom, DVM MS MBA is a veterinarian based in Ashland, Kentucky, with longtime ties to the Marianas animal care community.
The views expressed in this op-ed are those of the author and do not necessarily reflect the views of NMI News Service. NMI News Service welcomes op-ed submissions from the community. To submit, email brad.ruszala@nminewsservice.com.