The activity was developed by members of Group B during the 2003 American Society for Microbiology Undergraduate Microbiology Education Conference. Contributors are: Beth Gaydos, Jonathan Kidd, Lucy Kluckhohn Jones, Donna Harrison Bennett, Pat Johnson, Hilda Merchant, Pamela Huber, Diane Nurko Hilker, Sandra Horikami, and Gary Kaiser. Students are shown photographs of a family dining at an open air market. The photographs are captioned with personal information about the characters involved and the food and environment. The students answer questions to assess the situation for potential spread of infectious disease followed by a discussion of prevention methods and public health practices.