Cats Are Carrying Tick-Borne Disease More Often Than Anyone Realized
Tick-borne disease in cats is more common than most pet owners—and even many veterinarians—might expect. A new study screened 93 shelter cats for tick-borne pathogens and found pathogen DNA showing up at rates that surprised researchers. The findings suggest that cats play a much bigger role in local tick-borne disease cycles than previously thought, and that tick prevention for cats has been seriously underestimated.
Most people associate tick-borne illness with dogs. Cats get far less attention in this area. But this study is a reminder that your cat—especially one that spends time outdoors—may be quietly exposed to tick-borne pathogens without ever showing obvious signs of illness.
Why Cats Have Been Overlooked in Tick Research
When scientists study tick-borne diseases, dogs tend to be the focus. There are good reasons for this: dogs roam widely, interact with wildlife habitats, and are more likely to have visible ticks removed by their owners. Cats, by contrast, are often seen as lower-risk—particularly if they are indoor pets or if they groom away ticks before they are noticed.
This has created a gap in our understanding. Cats do encounter ticks, especially those that hunt small animals or spend time outdoors. And because cats are excellent groomers, a tick that hitches a ride may be swallowed before anyone notices it was there—but not before it has had time to transmit pathogens into the cat’s bloodstream.
The result is that infected cats may go undetected for a long time. If tick-borne pathogens are circulating in cats at meaningful levels, that is an important public health and pet health issue—one that this study was designed to shed light on.
How the Study Worked
Researchers collected blood samples from 93 shelter cats and tested each one using PCR (polymerase chain reaction). PCR is a highly sensitive molecular test—think of it as a DNA detector that can find traces of a pathogen even when it is present in tiny amounts. It works by identifying specific pieces of genetic material from bacteria or parasites, making it far more accurate than older tests that relied on the body’s immune response.
Using PCR to screen a group of shelter cats gave researchers a real-world snapshot of how common tick-borne pathogen DNA is in a population of cats with varied backgrounds. Shelter cats are a useful group to study because they have often had outdoor or semi-outdoor exposure before coming to the shelter, giving researchers a window into what cats in the broader community may be carrying.
Here is what the study setup looked like in brief:
- Who was studied: 93 shelter cats
- Test used: PCR—a molecular DNA test that detects even low levels of pathogen genetic material in blood
- Goal: Find out how often tick-borne pathogen DNA shows up in a real-world shelter cat population
- Why it matters: PCR can detect pathogens even in cats that appear completely healthy
What They Found
The results were striking. PCR screening detected tick-borne pathogen DNA in the shelter cat population at rates higher than researchers expected. This frequency suggests that tick-borne pathogens are not a rare or unusual finding in cats—they are present more often than the veterinary community has typically assumed.
The study’s authors concluded that cats may be playing a more active role in local tick-borne disease cycles than previously recognized. In ecology, this is sometimes described as animals serving as a “reservoir” or part of the disease cycle—hosts that carry pathogens in their bloodstream and can potentially pass them along when ticks feed on them and then move to other animals or people.
In plain terms: if cats are regularly picking up tick-borne pathogens and those ticks can then move around the home or yard, the potential for spread is higher than we have given it credit for.
What This Means for You and Your Cat
Tick Prevention Is Not Just for Dogs
The clearest takeaway from this study is that tick prevention should be on your radar for cats, not just dogs. If your cat goes outdoors—even just to a garden, porch, or yard—they may be encountering ticks. And if those ticks carry disease-causing pathogens, your cat can be exposed without you ever seeing a tick on them.
This matters for your cat’s health directly. Cats that carry tick-borne pathogens may not seem sick right away. But an infection can affect their overall health over time, especially if they have other underlying conditions or a weakened immune system.
Your Household May Be at Risk Too
Ticks do not stay on one animal. A tick that travels indoors on your cat—or on your dog, or on your clothing—can potentially expose other pets or family members. Reducing the tick burden on all pets in the household is a sensible step to reduce that risk.
Practical Steps to Take
- Ask your vet about tick prevention products for your cat. Safe, effective options exist for cats, but not all products used for dogs are appropriate for cats—some can be harmful. Always use products specifically approved for feline use.
- Check your cat regularly for ticks, especially after time outdoors. Pay attention to areas where ticks like to hide: around the ears, under the collar, and between the toes.
- Mention tick exposure history at vet visits. If your cat hunts, roams, or spends time in grassy or wooded areas, make sure your vet knows. This can guide decisions about screening and preventive care.
- Watch for vague signs of illness. Lethargy, loss of appetite, fever, or sudden changes in behavior can all be signs of infection in cats. Because tick-borne illness can look like many other conditions, mentioning any outdoor exposure helps your vet narrow down the possibilities.
When to Contact Your Veterinarian
If your cat spends time outdoors and develops any unexplained health changes—especially fatigue, reduced appetite, or fever—it is worth mentioning tick exposure as a possibility. Even if you have never found a tick on your cat, that does not rule out exposure. Early diagnosis through blood testing can make a real difference in outcomes.
Study Limitations
This study was conducted entirely in a shelter setting, which is an important caveat. Shelter cats may have had more outdoor exposure before intake than the average housecat, which could mean the rates seen here are higher than what you would find in a strictly indoor pet population. The study also did not follow up on whether the cats with pathogen DNA in their blood went on to develop clinical illness, so the health impact on individual cats is not fully known. Broader studies across different types of cat populations and geographic regions would help build a more complete picture.
Bottom Line
A PCR study of 93 shelter cats found tick-borne pathogen DNA at unexpectedly high rates, pointing to a greater role for cats in local tick-borne disease cycles than most pet owners or researchers have assumed. The practical message is simple: tick prevention and awareness should extend to cats, not just dogs. Talk to your veterinarian about tick prevention options appropriate for your cat, and stay alert to any health changes—especially if your cat has access to the outdoors.
Disclaimer
This article summarizes peer-reviewed research for educational purposes. Always consult with your veterinarian for personalized advice about your pet’s health and behavior.