Is there a laboratory test for being pathogenic or not a Bacteria in fish that not be needed Inject bacteria into fish or dipping?
For this purpose, is a bacterial culture in blood agar medium can be useful and definitive?
To determine pathogenicity of a microbe in an organism, you should isolate it from moribund individual or challenge healthy individuals with cultured microbe.
There is no way as far as I know
The easy way to isolate bacteria is to segregate it from the body of fish by swabbing and then culturing it on media.
You can state of pathogenicity profile of a bacteria if you can isolate it from lesions or symptomatic individuals. Also, you can confirm that statement, by doing a cohort study [exposed vs non-exposed]: contaminated group vs non-contaminated group.
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