Health and Disease
Pathogens, immunity and healthy lifestyles.
01Meet the PathogensMeet bacteria, viruses, fungi and protists and find out how they make us ill.Read lesson →02The Body's DefencesDiscover skin, stomach acid, white blood cells and antibodies that fight infection.Read lesson →03How Vaccines WorkLearn how vaccination trains the immune system to defeat a disease before it strikes.Read lesson →04A Healthy LifestyleExplore how diet, exercise, sleep and avoiding smoking protect long-term health.Read lesson →