An examination of the interactions of microbes in the human body including action, responses, treatment and prevention. Lecture (two hours), tutorial or lab or clinical problem (three hours); one term Prerequisite(s): HTH SCI 1LL3 (or 1AA3, 1BB3), 1H03, 1HH3 (or 1H06) and registration in Level II of the B.Sc.N. (A) or Level III of the B.Sc.N. (F) Stream; or permission of the instructor Antirequisite(s): HTH SCI 2B08, 2C06, 2C07, 2CC2