This unit provides students with an introduction to the key infectious agents which may pose a public or environmental health threat to the community. The unit covers surveillance and notifiable disease, water and air quality, food processing and micro-organisms from soil/air/food/water sources involved in outbreaks of disease. The laboratory methods introduce students to the detection of microbes in food processing. Guest lecturers from the Departments of Health and Water present a contemporary view of public health infectious disease in Western Australia. A unique feature of the unit is the involvement of PathWest, which has a strong reputation in public and environmental health microbiology.