K/ACit-

Alkaline/Acid Citrate Negative Group
The three organisms in this group are Morganella morganii, Proteus mirabilis, and Salmonela cholera-suis. By this point, mirabilis should be very obvious, as it's swarming motility will cause it to completely cover most plate media. The TSI slant may have shown H2S production which will be needed for the identification. SIM media is far more sensitive though and will give additional results for identification.

Tests
Essential: SIM media (sulfur and indole components) Phenylalanine/Urease

Key
1-A: Phenylalanine negative, urease negative, indole negative, sulfur positive Salmonella cholera-suis

1-B: Phenylalanine positive, urease positive, indole variable, sulfur variable GO TO 2

2-A: Sulfur negative, Indole positive Morganella morganii

2-B: Sulfur positive, Indole negative Proteus mirabilis