It describes how these pathogens exist everywhere in our environment and the various ways they can infiltrate the body through breathing, eating, or injuries. The text highlights the body’s natural defenses, such as skin, white blood cells, and antibodies, which work together to fight off infections. Readers learn that while bacteria cause illness by releasing toxins, viruses operate by hijacking and destroying healthy cells to reproduce. Finally, the source emphasizes the role of medical professionals who use tests and medicine to help the body recover from persistent sickness.
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