Answer:
Reisolate it, and determine if it is the original unknown bacteria.
Step-by-step explanation:
According to Koch's postulates, to determine the toxicity of a microorganism the following steps should be taken:
1) Isolate the microorganism from the organism in which it is present.
2) Introduce these microorganisms in other organisms.
3) Check if the disease or infection has occurred in the organisms in which the microorganism was injected.
4) If yes, then reisolate the bacteria. Check if it is the same bacteria that caused the disease in the initial organisms.
5) perform lab experiments on the microorganism and determine it.