This course is intended to provide importances of microbiology and parasitology in public health, practices regarding to morphology structure, identification of microorganisms and parasites, methods for sterilization and disinfection, application of indicator microorganisms in public health ,human immunological system and immunization, infectious and parasitic diseases in Thailand caused by bacteria, fungi, virus, protozoa and helminthes, diseases situation, sign and symptoms, life cycle, host, vector, modes of transmission, guideline for prevention and treatment, insects and animal borne diseases, microbial and parasitic diseases caused by climate change.