Bacteria
Bacteria in PetriKey
Gram-stain, morphology, and biochemical clues for the high-yield bacterial organisms.
78 reference cards
Acinetobacter baumannii
Healthcare-associated nonfermenting coccobacillus
Gram −Actinomyces israelii
Sulfur-granule filamentous anaerobe
Gram +Aeromonas hydrophila
Freshwater rod, wound and gut infection
Gram −Anaplasma phagocytophilum
Intracellular tick-borne bacterium of granulocytes
Gram −Bacillus anthracis
Spore-forming aerobic Gram-positive rod
Gram +Bacillus cereus
Reheated-rice food poisoning rod
Gram +Bacteroides fragilis
Anaerobic Gram-negative rod with capsule clue
Gram −Bartonella henselae
Cat-scratch disease, bacillary angiomatosis
Gram −Bordetella pertussis
Small respiratory coccobacillus with toxin vocabulary
Gram −Borrelia burgdorferi
Tick-borne spirochete
Brucella species
Undulant fever, unpasteurized dairy zoonosis
Gram −Burkholderia cepacia complex
Non-fermenter, cystic fibrosis lung pathogen
Gram −Burkholderia pseudomallei
Soil non-fermenter causing melioidosis
Gram −Campylobacter jejuni
Curved motile Gram-negative rod
Gram −Capnocytophaga species
Capnophilic gliding rod of dog and human oral flora
Gram −Chlamydia trachomatis
Obligate intracellular bacterium
Citrobacter species
Citrate-using enteric rods, E. coli mimics
Gram −Clostridioides difficile
Spore-forming anaerobic rod
Gram +Clostridium botulinum
Flaccid-paralysis canned-food anaerobe
Gram +Clostridium perfringens
Anaerobic spore-forming rod
Gram +Clostridium tetani
Terminal-spore tetanus rod
Gram +Corynebacterium diphtheriae
Club-shaped Gram-positive rod with toxin clue
Gram +Coxiella burnetii
Q fever, aerosol zoonosis, no vector needed
Gram −Cutibacterium acnes
Acne & prosthesis anaerobe (formerly Propionibacterium)
Gram +Ehrlichia chaffeensis
Obligate intracellular tick-borne bacterium of monocytes
Gram −Eikenella corrodens
HACEK fight-bite Gram-negative rod
Gram −Enterobacter cloacae
Motile enteric rod with inducible AmpC
Gram −Enterococcus faecalis/faecium
Bile-esculin and VRE vocabulary
Gram +Enterotoxigenic E. coli (ETEC)
Toxin-driven watery traveler's diarrhea pathotype
Gram −Escherichia coli
Gram-negative lactose-fermenting rod
Gram −Francisella tularensis
Tularemia, rabbit/tick zoonosis, cysteine need
Gram −Fusobacterium necrophorum
Lemierre-syndrome anaerobe
Gram −Gardnerella vaginalis
Clue-cell bacterial vaginosis rod
Haemophilus influenzae
Small Gram-negative coccobacillus with X/V factors
Gram −Helicobacter pylori
Curved urease-positive gastric rod
Gram −Kingella kingae
Fastidious HACEK coccobacillus of young children
Gram −Klebsiella pneumoniae
Encapsulated lactose-fermenting rod
Gram −Lactobacillus species
Doderlein vaginal-flora acid producer
Gram +Legionella pneumophila
Water-associated intracellular rod
Gram −Leptospira interrogans
Question-mark spirochete; rat-urine water exposure
Listeria monocytogenes
Tumbling motility Gram-positive rod
Gram +Moraxella catarrhalis
Oxidase-positive Gram-negative diplococcus
Gram −Morganella morganii
Urease- and indole-positive nosocomial enteric rod
Gram −Mycobacterium avium complex
Nontuberculous mycobacteria; disseminated in advanced HIV
Mycobacterium leprae
Acid-fast leprosy bacillus (cannot be cultured)
Mycobacterium marinum
Photochromogen of fish-tank granuloma
Mycobacterium tuberculosis
Acid-fast rod
Mycoplasma pneumoniae
No cell wall atypical bacterium
Neisseria gonorrhoeae
Oxidase-positive Gram-negative diplococcus
Gram −Neisseria meningitidis
Gram-negative diplococci
Gram −Nocardia species
Branching weakly acid-fast aerobic rods
Pasteurella multocida
Cat/dog bite coccobacillus, rapid cellulitis
Gram −Proteus mirabilis
Urease-positive swarming rod
Gram −Pseudomonas aeruginosa
Oxidase-positive nonfermenting rod
Gram −Rickettsia rickettsii
Obligate intracellular tick-borne bacterium
Salmonella enterica
Motile non-lactose fermenting enteric rod
Gram −Serratia marcescens
Red-pigmented healthcare-associated rod
Gram −Shiga toxin-producing E. coli (STEC/EHEC)
Shiga-toxin pathotype linked to HUS
Gram −Shigella species
Nonmotile non-lactose fermenting rod
Gram −Staphylococcus aureus
Gram-positive cocci in clusters
Gram +Staphylococcus epidermidis
Coagulase-negative skin flora clue
Gram +Staphylococcus saprophyticus
Coagulase-negative, novobiocin-resistant clue
Gram +Stenotrophomonas maltophilia
Multidrug-resistant nosocomial non-fermenter
Gram −Streptococcus agalactiae
Group B beta-hemolytic streptococcus
Gram +Streptococcus anginosus group
Abscess-forming viridans (milleri) streptococci
Gram +Streptococcus gallolyticus (bovis)
Group D strep linked to colon cancer
Gram +Streptococcus mutans
Dental caries viridans streptococcus
Gram +Streptococcus pneumoniae
Lancet diplococci and capsule clue
Gram +Streptococcus pyogenes
Group A beta-hemolytic streptococcus
Gram +Treponema pallidum
Spirochete with serology vocabulary
Tropheryma whipplei
Actinobacterium of PAS-positive Whipple disease
Gram +Ureaplasma urealyticum
Cell-wall-free urease-positive genital mycoplasma
Vibrio cholerae
Comma-shaped oxidase-positive rod
Gram −Vibrio parahaemolyticus
Salt-loving seafood gastroenteritis vibrio
Gram −Vibrio vulnificus
Marine vibrio, wound and shellfish sepsis
Gram −Viridans streptococci
Alpha-hemolytic optochin-resistant oral strep
Gram +Yersinia enterocolitica
Cold-tolerant enteric rod, pseudoappendicitis
Gram −Yersinia pestis
Flea-borne plague, safety-pin bipolar rod
Gram −