This work conducted to determine the prevalence, incidence and zoonosis of Giardia lamblia parasite between human and animal, which in contact directly and indirectly with showing the effect of the parasite on the public health. Also it identified the transmission of the parasite from human to animal and it's modes of transmission from the environment to human, the Nested PCR technique has been used to diagnose and identify zoonotic infection among cows and human. this book provide the clinical examination data of human and cow infected with Giardia, microscopical examination of Giardia,...