Giardiasis infection risks in pets and humans

Giardiasis is an intestinal infection caused by the protozoan Giardia intestinalis, which affects both humans and animals, including dogs and cats. The parasite lives in the host's intestine and is eliminated through feces, spreading via contaminated water, food, or surfaces.

A recent study published in the scientific journal PLOS One, which analyzed domestic cat fecal samples from North America, estimated that approximately one in 15 cats could be infected. Among those infected, about one in five may carry strains with the potential to transmit the infection to humans. The study noted that infection was more frequently detected in cats under one year of age, while detection rates were lowest during summer months.

Common symptoms in pets include diarrhea, abdominal pain, vomiting, weight loss, and lethargy. In humans, the infection can cause similar digestive issues. Transmission to humans typically occurs through accidental ingestion of the parasite via contaminated hands, water, or surfaces.