Table 6.

Results when isolates were tested on an incorrect panel or using an incorrect algorithm, i.e., inoculation of Gram-negative species on Gram-positive panels or vice versa, or of Gram-positive species incorrectly assigned as “Streptococcus” or “Micrococcus” based on faulty catalase or microscopy results. The expected result for this type of incorrect panel use is “identification not possible”. For Gram-negative species inoculated on Gram-positive panel, we assumed Micrococcus interpretation for the results in this table, as most of them would be catalase positive. Note that all results other than “identification not possible” are wrong; detailed results for each species can be found in Supplementary Table S3. Incorrect identifications with high probability are listed in Table 5. N = total number of isolates tested.

Species.	N	Panel/Algorithm Used	Number “Identification not Possible” (%)	Number Low Probability Identification (%)	Number High Probability Identification (%)
Gram-negative species tested on Gram-positive panels and vice versa
Enterobacterales	41	Gram-positive	27	9	5
Non-fermenters	23		10	6	7
Total Gram-negatives on Gram-positive panel	64		37 (57.8%)	15 (23.4%)	12 (18.8%)
Staphylococcus species	16	Gram-negative	1	11	4
Streptococcus species	53		15	12	26
Gram-positive bacilli (Bacillus & Corynebacterium species)	11		2	4	5
Total Gram-positive on Gram-negative panel	80		18 (22.5%)	27 (33.8%)	35 (43.8%)
Staphylococcus/Micrococcus species using Streptococcus species algorithm and vice versa
Staphylococcus/Micrococcus species and Gram-positive rods	60	Streptococcus algorithm	35	11	14
Streptococcus/Enterococcus species	95	Micrococcus algorithm	27	24	44
Total Gram-positive with incorrect algorithm	155		62 (40.0%)	35 (22.6%)	58 (37.4%)
Total tested on incorrect panel/incorrect algorithm	299		117 (39.1%)	77 (25.8%)	105 (35.1%)