Cat owners often debate whether it’s better to keep cats indoors or let them roam freely outside. That’s why Kayleigh Chalkowski, a researcher at the School of Forestry and Wildlife Sciences at Auburn University in Alabama, decided to study the prevalence of diseases across interior and exterior environments.

The study looked at 19 different cat pathogens in more than a dozen countries, including Spain, Canada, Australia, Switzerland, Germany, Pakistan, Brazil, the Netherland and St. Kitts. The result is that outdoor cats are far more likely to get sick than indoor cats. So if you love your cat and want to keep it healthy, keep it indoors.

To learn more about the safety of keeping cats inside, click here.