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.
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.
