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Read this excerpt from When Birds Get Flu and Cows Go Mad! How Safe Are We?.

24/7: What kinds of careers are there in disease control?
DR. SCOTT DOWELL: Many types. I’m an epidemiologist. That means I investigate the spread and control of diseases in big populations. Or you could become a virologist. That’s a microbiologist who specializes in viruses. If you’re interested in animal diseases, you could become a veterinarian.

How could a video best extend the information Dr. Dowell gives about careers in disease control?

A video could define different types of careers in disease control.
A video could show Dr. Dowell speaking about careers in disease control.
A video could explain that there are many careers in disease control.
A video could show people working in different disease control careers.