An etiologist is investigating a new disease and observes what appear to be bacteria inside tissue cells in clinical samples from victims. What is the first thing he has to do to try to identify the causative agent of the infectious disease?

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Answer:

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Explanation:

The first thing that the etiologist can do is try and culture bacteria from the tissue samples in the lab. And then study about the bacterium's properties and characterstics that are leading to causing diseases in the humans.