If you are infected with a particular bacteria, how is a diagnosis made? what does a lab look for?

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Well, you would get an idea of the microorganism causing the infection, for example, a bacteria called Shigella, usually causes gastrointestinal infection. However, in these days, as a microbiologist, you should have an open mind.

Usually, you should analyze the biological sample (tissue, sputa, pleural liquid, secretion, etc.) with a microscopy, an putting some of the sample in a media culture, who is designed to make more easily the growth of the microorganism of interest, so then you make biochemical identification of it, so you can determine the type of microorganism.

There are other methods, like molecular techniques, or immunilogical techniques that can be of great help.

usually under a microscope,or culture dish/microscope

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If you are infected with a particular bacteria, how is a diagnosis made? what does a lab look for?

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