What techniques might be a part of an epidemiologist’s work? Select all that apply.

Epidemiologists investigate patterns and causes of illness by gathering information from people who are sick and from health-care providers, laboratories, and health departments. They may also test suspected sources, such as spoiled food, and collect mosquitoes to check whether they carry disease. Feeding mosquitoes to keep them healthy and performing surgery are not typical epidemiological investigation techniques.

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