With a team of microbiologists from McGill University, CBC Montreal Investigates/Radio-Canada conducted tests for bacteria on tables, trays and garbage bins at four different shopping centres in the Montreal area: Fairview Pointe Claire, the Eaton Centre, Complexe Desjardins and Champlain Mall.

Dr. Lawrence Goodridge, an associate professor with McGill University's Department of Food Science and Agricultural Chemistry, walks us through the different types of bacteria you're probably coming into contact with every day.

On mobile? See the interactive here