Global Study Reveals Roaming Pet Cats Carry Infectious Disease Risks Equal to Feral Populations

UBC research finds outdoor pet cats carry nearly 100 human-infecting pathogens, matching feral cat disease rates despite receiving regular veterinary care.

By: AXL Media

Published: Apr 30, 2026, 8:34 AM EDT

Source: Information for this report was sourced from EurekAlert!

The Hidden Pathogen Bridge in Domestic Backyards

A massive global synthesis of feline health data has overturned the long held assumption that domestic pets are shielded from the heavy disease burdens of their feral counterparts. Lead researcher Dr. Amy Wilson, an adjunct professor at the University of British Columbia, reports that owned cats allowed to roam unsupervised are frequently exposed to a vast array of infectious agents. This behavior creates a direct biological link between wild ecosystems and human living spaces, as these animals carry pathogens at rates that mirror those found in unowned, stray populations.

The Global Scale of Feline Infection Landscapes

The research team conducted a rigorous review of 604 independent studies, encompassing more than 174,000 individual cats across 88 different countries. This extensive dataset allowed the scientists to identify 124 distinct pathogen species, with nearly 100 of those being zoonotic, meaning they are capable of jumping from animals to humans. According to Dr. Wilson, while feral cats still harbor the highest overall diversity of diseases, the sheer volume of pet cats allowed outdoors means that public health frameworks focusing solely on strays are neglecting a primary source of community risk.

Microscopic Threats Lurking Beneath Professional Veterinary Care

Despite receiving regular meals, vaccinations, and shelter, domestic cats that hunt or explore outdoors remain susceptible to persistent biological threats. The study highlighted the presence of Toxoplasma gondii, roundworms, and Bartonella, the latter of which causes cat scratch fever, alongside the bacterium Leptospira. The data suggests that medical interventions like deworming and standard vaccines are insufficient on their own, as they do not address the full spectrum of environmental pathogens a cat encounters while stalking prey or interacting with contaminated soil.