| Algorithm |
Bug |
| Gram + cocci, catalase +, coagulase + | S. aureus |
| Gram + cocci, catalase +, coagulase -, novobiocin sensitive | S. epidermidis |
| Gram + cocci, catalase +, coagulase -, novobiocin resistance | S. saprophyticus |
| Gram + cocci, catalase -, β hemolytic, bacitracin sensitive | S. pyogenes |
| Gram + cocci, catalase -, β hemolytic, bacitracin resistant | S. agalactiae |
| Gram + cocci, catalase -, α, β, or γ hemolytic, grows in 40% bile (Group D), grows in 6.5% NaCl | E. faecalis |
| Gram + cocci, catalase -, α, β, or γ hemolytic, grows in 40% bile (Group D), susceptible to 6.5% NaCl | S. bovis |
| Gram + cocci, catalase -, α hemolytic, bile-esculin negative, optochin susceptible | S. pneumoniae |
| Gram + cocci, catalase -, α hemolytic, bile-esculin negative, optochin resistant | S. mutans, S. intermedius |
| Gram + bacilli, spore-forming, aerobic, motile | B. cereus |
| Gram + bacilli, spore-forming, aerobic, non-motile | B. anthracis |
| Gram + bacilli, spore-forming, obligate anaerobe, motile | C. tetani, C. botulinum, C. difficile |
| Gram + bacilli, spore-forming, obligate anaerobe, non-motile | C. perfringens |
| Gram + bacilli, non-spore-forming, motile | L. monocytogenes |
| Gram + bacilli, non-spore-forming, non-motile | C. diptheriae |
| Gram + beaded filaments, not acid fast, obligate anaerobe | A. israeli |
| Gram + beaded filaments, weakly acid fast, obligate aerobe | N. asteroides, N. brasiliensis |
