Table 2.
Original LOUIS test algorithm
| LDC | CNPG | URE | IND | Possible identification | STEP 1 | STEP 2 | |
|---|---|---|---|---|---|---|---|
| + | + | − | − | + E. coli | Discard | ||
| + | − | − | + | ||||
| − | − | + | + | Proteus spp or | Discard | ||
| − | − | + | − | Morganella morganii | |||
| + | − | − | − | Salmonella | Confirm by serology (O and H antigens) | Positive API rapid ID32E (4h) | Negative serology: Discard |
| − | − | − | − | Shigella spp (possible LDC negative Salmonella) | API rapid ID32E (4h) | Confirm by serology | Negative serology: Discard |
| − | − | − | + | Shigella spp | API rapid ID32E (4h) | Confirm by serology | Negative serology: Discard |
| − | + | − | − | Shigella sonnei or Sh. dsyenteriae 1 | Confirm by serology | Positive API rapid ID32E (4h) | Negative serology: Discard |
± Discard any other combination of reactions