| Gram-positive aerobic cocci, clusters | Staphylococcus |
| Gram-positive aerobic cocci, chains | Streptococcus, Enterococcus |
| Gram-positive aerobic bacilli | Bacillus, Corynebacterium, Listeria |
| Gram-negative non-enteric bacilli | Acinetobacter, Pseudomonas, Burkholderia, Stenotrophomonas |
| Gram-negative enteric bacilli | (Enterobacterales family) Escherichia coli, Klebsiella, Enterobacter, Proteus, Citrobacter, Serratia, |
| Gram-positive anaerobic cocci | Peptostreptococcus |
| Gram-positive anaerobic bacilli | Clostridium (sporulating), Actinomyces, Lactobacillus |
| Gram-negative anaerobic bacilli | Bacteroides |