This document discusses health, illness, and advances in medicine. It describes how diseases can be infectious, caused by pathogens like bacteria and viruses, or non-infectious, not caused by organisms. Infectious diseases like tetanus, salmonellosis, and colds are transmitted through the nose, mouth or mosquito bites. Non-infectious diseases include allergies, asthma, cancer, and diabetes. The document provides tips for staying healthy such as eating nutritious meals, getting exercise, sleeping, hygiene, and prevention. It also outlines some major advances in medicine including vaccines, antibiotics, x-rays, scans, and new surgical techniques.