Researchers studied 100 cats without deworming history to understand how common intestinal worms are and which cats are most at risk. They found that nearly 1 in 4 cats had parasitic worms, with hookworms being the most common type. Young kittens, female cats, and certain breeds were more likely to have infections. The study also revealed that these worms can sometimes spread to humans, but most cat owners didn’t know about this risk. Regular deworming, vaccination, and proper feeding appear to be important ways to protect both cats and their owners from these parasites.
The Quick Take
- What they studied: How common are intestinal worms in pet cats, which cats are most likely to get them, and can these worms spread to humans?
- Who participated: 100 domestic cats of various ages, breeds, and living situations that had never received deworming treatment
- Key finding: About 23% of cats (roughly 1 in 4) had intestinal worms. Hookworms were found in 11% of cats, roundworms in 7%, and tapeworms in 2%. Young kittens under 6 months old had the highest infection rates at 36%.
- What it means for you: If you own a cat, regular deworming is important for keeping your pet healthy and reducing the small but real risk of parasites spreading to your family. This is especially important for kittens and outdoor cats.
The Research Details
Researchers examined 100 cats over a six-month period to check for intestinal parasites. They collected information about each cat’s age, breed, living conditions, diet, vaccination history, and deworming status. They also asked cat owners about their knowledge of diseases that could spread from cats to humans. The researchers then used statistical analysis to identify which factors were most strongly connected to parasite infections.
This type of study is called a cross-sectional study, which means researchers took a snapshot in time rather than following cats over many years. The study included cats that had never been dewormed, which helped researchers understand the natural rate of parasite infections in the cat population.
By studying cats that had never been dewormed, researchers could see how common these parasites naturally are without treatment interfering with the results. This helps veterinarians and pet owners understand which cats need the most attention and protection. The study also included questions about owner knowledge, which is important because education can help prevent disease spread.
The study examined a reasonable number of cats (100) and looked at multiple risk factors. The researchers used proper statistical methods to determine which factors were truly connected to infections. However, the study only looked at cats at one point in time, so it can’t prove that certain factors directly cause infections—only that they’re associated with them. The study didn’t specify the exact geographic location or how cats were selected, which could affect how well the results apply to all cat populations.
What the Results Show
Nearly 1 in 4 cats (23%) had intestinal worms. Hookworms were the most common parasite, found in 11% of cats, followed by roundworms in 7% of cats. Some cats had multiple types of worms at the same time (3% of cats). Very young kittens under 6 months old were hit hardest, with more than 1 in 3 (36%) having worms. Interestingly, female cats had higher infection rates (27%) compared to male cats (19%).
Certain cat breeds were more vulnerable. Mixed-breed or non-purebred cats had infection rates of 35%, while purebred cats had rates of 14%. Cats that lived indoors in confined spaces had lower infection rates than those with outdoor access, though this difference wasn’t statistically significant. Cats that were vaccinated and dewormed had much lower infection rates than unvaccinated, undewormed cats.
The study found that diet mattered too. Cats fed vegetarian diets had higher infection rates than those fed mixed diets with meat. This makes sense because meat-based diets may provide better nutrition to fight off infections. Only 33% of the cats in the study had been vaccinated, and just 20% had ever been dewormed, suggesting many cat owners weren’t following recommended preventive care.
The research revealed concerning behavioral signs in infected cats. About half of the cats (51%) showed excessive licking behavior, and 13% engaged in self-biting. These behaviors may indicate discomfort from parasites. The study also found that 72% of cats were kept in confined indoor spaces, which generally provides some protection from parasites compared to outdoor access. However, most cat owners (59%) fed their cats a combination of cooked food and commercial cat food, which is a reasonable approach. Importantly, only 41% of cat owners were aware that parasites in cats could spread to humans—a significant knowledge gap that could affect public health.
This study adds to existing research showing that intestinal parasites are common in cats worldwide. The 23% infection rate found here is consistent with other studies in similar regions. Previous research has established that hookworms and roundworms are the most common feline parasites, which matches these findings. The study confirms what veterinarians have long known: young animals, unvaccinated animals, and those without deworming treatment are at highest risk. The finding that most cat owners don’t know about zoonotic risks (diseases spreading from animals to humans) highlights an important gap in public education that other studies have also identified.
The study only looked at 100 cats at one point in time, so results may not represent all cats everywhere. The study didn’t clearly explain how cats were selected, which could introduce bias. The researchers didn’t specify the geographic location, making it unclear how well these results apply to other regions. The study couldn’t prove that certain factors directly cause infections—only that they’re associated with them. For example, while unvaccinated cats had higher infection rates, the study can’t prove that vaccination prevents parasites (though it’s likely). The study also didn’t measure how severe infections were or track cats over time to see if infections got better or worse.
The Bottom Line
Cat owners should have their cats dewormed regularly, starting when kittens are young. Kittens should be dewormed every 2 weeks until 12 weeks old, then monthly until 6 months old, then at least twice yearly. Adult cats should be dewormed at least twice yearly, or more often if they have outdoor access. Vaccination is also important and should be kept current. Provide a balanced diet with adequate nutrition rather than vegetarian diets. Maintain good hygiene practices, especially when handling cat litter, and wash hands thoroughly. These recommendations are supported by strong evidence (high confidence) based on this and other studies.
All cat owners should care about this research, especially those with kittens, outdoor cats, or unvaccinated cats. Families with young children, elderly members, or people with weakened immune systems should be extra cautious, as they’re more vulnerable to parasites spreading from cats. Veterinarians should use this information to educate clients about deworming importance. People who work with cats professionally (shelter workers, breeders) should be particularly aware. However, this research is less relevant to people without cats or those with indoor, vaccinated, and regularly dewormed cats.
You should see improvements relatively quickly. Most deworming medications work within 24-72 hours, eliminating adult worms. However, preventing new infections requires ongoing prevention. You may notice behavioral improvements (less licking, better appetite) within 1-2 weeks as the cat feels better. Complete protection requires maintaining a regular deworming schedule—typically twice yearly for indoor cats and more frequently for outdoor cats. Vaccination takes about 2 weeks to become fully effective.
Want to Apply This Research?
- Set reminders for deworming dates (typically every 6 months for indoor cats, every 3 months for outdoor cats) and track when each deworming was completed. Note the type of deworming medication used and any side effects observed.
- Use the app to schedule and track vaccination appointments alongside deworming schedules. Create a checklist for preventive care: deworming, vaccination, diet quality, and hygiene practices (like handwashing after litter box use). Set monthly reminders to review your cat’s health status and note any behavioral changes like excessive licking or loss of appetite.
- Track your cat’s weight, appetite, and energy levels monthly to monitor overall health. Note any digestive issues or behavioral changes. Keep a record of all veterinary visits and preventive treatments. Set annual reminders to discuss parasite prevention strategies with your veterinarian based on your cat’s lifestyle (indoor vs. outdoor) and risk factors.
This research summary is for educational purposes only and should not replace professional veterinary advice. If you suspect your cat has parasites or if you have concerns about disease transmission to your family, consult your veterinarian immediately. Pregnant women, young children, and immunocompromised individuals should take extra precautions around cats and practice strict hygiene. Always follow your veterinarian’s recommendations for deworming schedules and parasite prevention, as these may vary based on your cat’s individual risk factors and geographic location.
This research translation is published by Gram Research, the science division of Gram, an AI-powered nutrition tracking app.