This product focuses on the following areas: the immune system - what it is and what it does, the mainlines of defense against pathogens, how to keep your immune system strong, unhealthy habits to avoid that weaken the immune system, first line defenses - skin, air passages, eyes, stomach, nose and throat, other body defenses - white blood cells, fever and antibodies, an example of other body defenses, symptoms for communicable diseases - cold, flu, and sore throat, common sigs and symptoms of i