Toxoplasma gondii
The main factors causing "Toxoplasma gondii" seropositivity on cats are age, raw meat and outdoor access. A study shows that "T. gondii" seropositivity varies by cat breeds. Norwegian Forest cats have a relatively high rate of "Toxoplasma gondii" seropositivity (4.66%) comparing with other pure-bred cats (Birman: 4.16%, British Shorthair: 3.39%, Korat: 2.03%, Ocicat: 4.26%, Siamese: 2.57%), but slightly lower than Persian cats (6.99%).