The course will give a review of the innate and acquired immunity and their components, including both the humoral and cellular arms of the immune response. The course is designed to help you in understanding the animal body defense mechanisms at cellular and molecular levels. The role of host defense mechanisms and the development of acquired immunity after infection will be discussed. The use of the different immunological tests in diagnosing animal diseases, malfunctions of the immune response and the role of vaccines in disease prevention will be covered.