KS3: Respiratory Hygiene In this lesson plan, students learn how easily microbes can be spread through coughs and sneezes resulting in infection spreading over large areas. Scroll down for more information and to download resources. Download the complete lesson Understand how microbes can cause illness, how infections spread, and the importance of good hygiene practices in preventing transmission. Colds and flus are the most common illnesses in the classroom and perhaps one of the most contagious. Corona...