Diagnosis Algorithm
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| Algorithm |
 |
|
| Bug |
|
|
| Gram - diplococci, maltose & glucose oxidizer |
N. meningitidis |
| Gram - diplococci, only glucose oxidizer |
N. gonorrhoeae |
| Gram - bacilli, lactose fermenter, fast fermenter, biochemical tests |
K. pneumoniae |
| Gram - bacilli, lactose fermenter, fast fermenter, indole + |
E. coli |
| Gram - bacilli, lactose non-fermenter, oxidase -, produces H2S, motile |
S. typhi, S. enteritidis |
| Gram - bacilli, lactose non-fermenter, oxidase -, does not produce H2S, non-motile |
S. dysenteriae |
| Gram - bacilli, lactose non-fermenter, oxidase -, urease + |
P. mirabilis |
| Gram - bacilli, lactose non-fermenter, oxidase +, glucose + |
V. cholerae |
| Gram - bacilli, lactose non-fermenter, oxidase + |
P. aeruginosa |
| Gram - bacilli, lactose non-fermenter, motile @ 25° C, not at 37° C |
Y. enterocolitica |
| Gram - bacilli, lactose non-fermenter, bipolar staining |
Y. pestis |
| Gram - bacilli, curved, small growth on Campy agar, urease + |
H. pylori |
| Gram - bacilli, curved, small growth on Campy agar, urease - |
C. jejuni |
| Gram - bacilli, strict anaerobe |
B. fragilis |
| Gram - coccobacilli, pleomorphic, X & V factors required |
H. influenzae |
| Gram - coccobacilli, pleomorphic, growth on charcoal yeast agar with iron & cysteine |
L. pneumophila |
| Gram - coccobacilli, pleomorphic, growth on Bordet-Gengou medium |
B. pertussis |
| Gram - coccobacilli, pleomorphic, aerobic |
Brucella |
| Gram - coccobacilli, pleomorphic, requires cysteine for growth |
F. tularensis |
| Gram - coccobacilli, pleomorphic, oxidase +, catalase + |
P. multocida |
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