Researchers have found a way to identify microorganisms that can help you avoid the flu.

A list of microbes that could be present in the air is one method of testing the safety of a home, and scientists have long used a bacterial test to do so.

This article explains how to use this technique in a lab setting, how to determine if a list of micro-organisms is accurate and the benefits and risks of using a microbial test in your own home.

This is part one of a three-part series.

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