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Safe Food Preparation

Author(s): Sonia Rahmati Clayton, PhD, and Nancy Moreno, PhD
Showing Results for: washing hands Return to Presentation


Have the students compare and describe microbe growth on nutrient agar plates inoculated with swabs from (1) unwashed hands and (2) hands washed with soap and rubbed with hand sanitizer. 

Lead a class discussion about the importance of hand washing. Emphasize that this simple step is the most effective way for us to help control the spread of microbes and disease. 

View this short video from the CDC, demonstrating proper hand washing technique and the importance of washing hands: 

Clean Hands Help Prevent the Flu

Have students compare and describe the results from similarly inoculated Petri dishes, after three days, with one dish stored in a refrigerator and the other incubated in a warm place. Help the students to understand the importance of refrigerating leftover food as a means to help control microbe growth.

Funded by the following grant(s)

National Institute of Environmental Health Sciences, NIH

National Institute of Environmental Health Sciences, NIH

My Health My World: National Dissemination
Grant Number: 5R25ES009259
The Environment as a Context for Opportunities in Schools
Grant Number: 5R25ES010698, R25ES06932