KS3: Respiratory Hygiene In this lesson plan, students learn how easily microbes can be spread through coughs and sneezes, resulting in infections spreading over large areas. This lesson complements the Health and Prevention element of the new PHSE/ RSHE curriculum for KS3. Scroll down for more information and to download resources. Download the complete lesson Understand that sometimes microbes can make us ill Understand that prevention of infection, where possible, is better than cure Understand not to ...