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Unit 3

When does a microbe become pathogenic?

What is the difference between a pathogen and a microbe? As we’ll explore in this unit, most microbes can be pathogenic if they are in the right location. There are also adaptations that allow certain microbes to bypass host defenses and become extremely pathogenic.

Lesson 1: The zoo in you — our microbial ecosystem and Ebola (pdf)

Lesson 2: Reservoirs and vectors — Lyme disease and Malaria (pdf)

Lesson 3: Invasion of the body snatchers — Fighting back after infection (pdf)

Do Online: Unit 3 Multimedia

Infectious Disease Blog: Unit 3 Further Reading