Question

You are trying to determine the TSI tube results for an unknown organism. The tube was inoculated 7 days ago and was "lost" in the incubator. The tube has a bright red slant and a bright red butt. What can you conclude from these results?

Answer 1

Answer:

The results are useless

Explanation:

The alkaline/alkaline results could indicate that only the protein was utilized by the organism, but it could also be a result of prolonged incubation. The organisms could have exhausted that available sugar and then reverted to protein catabolism.

Answer 2

Answer:

The result is useless

Explanation:

The extended incubation period renders these results useless. The K/K result could indicate that only proteins were utilized by the organism, but this could be a secondary result due to the prolonged incubation. The organism could have exhausted the available sugars and then reverted to protein catabolism after 48 hours of incubation. You would be able to reliably ascertain whether or not H2S/blackening was present.

The alkaline/alkaline results could indicate that only the protein was utilized by the organism, but it could also be a result of prolonged incubation. The organisms could have exhausted that available sugar and then reverted to protein catabolism.