pt. 1. Introduction -- pt. 2. Human and microbial interaction -- pt. 3. Bacteria, and the infections they cause -- pt. 4. Viruses, and the infections they cause -- pt. 5. Fungi, and the infections they cause -- pt. 6. Infections and infestations caused by other parasites -- pt. 7. Some common infections -- pt. 8. Dealing with infections -- pt. 9. The prevention of infections