What organism is identified from a urine culture given the biochemical reactions: IMViC ++--, Motility Positive, Urease Negative?

The organism identified from the urine culture with the specified biochemical reactions is Escherichia coli. The IMViC test results of ++-- indicate that the organism is indole positive, methyl red positive, and both Voges-Proskauer and citrate tests are negative. These results are characteristic of Escherichia coli, which aligns with its typical biochemical profile.

Additionally, the motility being positive indicates that the organism is motile, which is a common feature of Escherichia coli. The urease test being negative further supports this identification, as Escherichia coli does not produce urease, contrasting with some other enteric bacteria such as Proteus mirabilis, which is urease positive.

When evaluating the other options, Klebsiella pneumoniae would typically show a positive IMViC result for the Voges-Proskauer test. Staphylococcus saprophyticus is a gram-positive cocci that does not fit the IMViC reactions or the motility profile. Lastly, Proteus mirabilis is urease positive, which contradicts the negative urease result in this scenario. Therefore, all biochemical reactions strongly indicate that Escherichia coli is the correct identification from the culture.