Toxoplasmosis is a disease that affects all species of warm-blooded animals (mammals and birds) and man. The disease causes microscopically small, single-celled parasite Toxoplasma gondii, which has expanded all over the world including in our country. It is believed that about 50% of the human population at some point in his life was in contact with toxoplasmosis. Toxoplasmosis is dangerous to people with weakened immune systems and pregnant women. If infection occurs during pregnancy, the parasite can infect the fetus and create serious health problems and even death of the fetus. Domestic and wild cats are the only real definitive hosts of T. gondii, unlike all other animals and humans which are intermediate hosts. This means that only the cat takes the entire development cycle of the parasite and not only those evicted agents (oocysts) in the faeces. In animal invasion usually flows without symptoms. The disease occurs in younger animals and animals with infection weakened immune systems.