This Book will be concern the epidemiological and zoonotic aspects of latent human and animal toxoplasmosis, mechanism and factors inducing latency, with the major human illness. Also, will be discuss the advances in diagnosis and preventive control measures which serve reducing economical draw backs on animals and human health. Toxoplasma gondii is an ideal zoonotic coccidian protozoan; it can spread via most typical zoonotic manners, by direct, cyclo and saprozoonosis. Since human blood transfusion and organs transplantation were medicinal advanced, latency in toxoplasmosis has occupied...