Gram-negative aerobic and facultative rods · Gram-negative aerobic and facultative rods ......
Transcript of Gram-negative aerobic and facultative rods · Gram-negative aerobic and facultative rods ......
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Gram-negative aerobic and facultative rods
Enterobacteriaceae and others
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Acinetobacter calcoaceticus A. lwoffi and A. anitratus mostly occur as short coccobacilli in
cultures. They resemble diplococci and may sometimes be mistaken for Neisseria (Gram stain).
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Actinobacillus actinomycetemcomitans
Actinobacillus actinomycetemcomitans occur as short coccobacilli in culture, on certain media they are
longer (Gram stain).
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Aeromonas sp. Gram-negative rods in culture (Gram stain).
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Bordetella bronchiseptica Small Gram-negative rods in culture (Gram stain).
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Bordetella bronchiseptica Small Gram-negative rods in culture (Gram stain).
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Bordetella pertussis The Bordet-Gengou bacillus. Very small coccobacilli
in culture (Gram stain).
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Bordetella pertussis The Bordet-Gengou bacillus. Small coccobacilli in
culture (Gram stain).
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Brucella melitensis Slender Gram-negative coccobacilli in culture
(Gram stain).
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Capnocytophaga canimorsus Gram-negative rods from a culture showing characteristic fusiform morphology (Gram stain).
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Capnocytophaga ochracea Gram-negative rods from a culture showing characteristic fusiform morphology (Gram stain).
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Cardiobacterium hominis Small Gram-negative rods from a fresh culture
(Gram stain).
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Cardiobacterium hominis Small Gram-negative rods and two tear-cells from an
older culture (Gram stain).
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Enterobacter aerogenes Gram-negative rods in culture (Gram stain).
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Escherichia coli Massive pyuria and numerous Gram-negative rods in a
urinary sediment from a patient with a urinary tract infection (Gram stain).
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Escherichia coli Atypical growth in a blood culture from a patient under antibiotic treatment. Very long threads, some
poorly stained (Gram stain).
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Escherichia coli Coliform (pink due to lactose fermentation) colonies
on Mac Conkey agar.
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Francisella tularensis Very tiny Gram-negative cocco-bacilli in a culture
(Gram stain).
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Haemophilus ducreyi Gram-negative rods in typical rows in a smear of
genital ulcer (Gram stain).
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Haemophilus influenzae Pleomorphic Gram-negative rods in purulent sputum
(Gram stain).
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Haemophilus influenzae Pleomorphic Gram-negative cocco-bacilli in purulent
sputum (Gram stain).
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Haemophilus influenzae Pleomorphic Gram-negative cocco-bacilli and
pneumococci in purulent sputum (Gram stain).
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Haemophilus influenzae Spheroblast formation, swollen Gram-negative coccobacilli, in
a culture from Haemophilus influenzae after contact with low concentrations of penicillin (Gram stain).
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Haemophilus parahaemolyticus Gram-negative pleomorphic rods in culture on a blood
containing agar. The organism is distinctly broader than H. influenzae (Gram stain).
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Gardnerella vaginalis Short, slender Gram-negative (sometimes Gram-variable) rods
in very large numbers in vaginal secretion. They often cover theepithelial cells, which are then called «clue-cells» (Gram stain).
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Gardnerella vaginalis Short, mostly slender Gram-negative, but here Gram-
variable rods in very large numbers in vaginal secretion (Gram stain).
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Kingella kingae Gram-negative diplobacilli, in culture (Gram stain).
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Kingella kingae Gram-negative diplobacilli, in culture (Gram stain).
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Klebsiella oxytoca A few white blood cells and Gram-negative rods in
sputum (Gram stain).
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Klebsiella pneumoniae The Friedlander bacillus. White blood cells and
numerous Gram-negative rods (some encapsulated) in sputum (Gram stain).
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Klebsiella pneumoniae The Friedlander bacillus. White blood cells and
numerous Gram-negative rods in sputum (Gram stain).
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Klebsiella pneumoniae Short non-motile Gram-negative rods from a culture
(Gram stain).
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Legionella pneumophila Gram-negative rods with a constant width from a
culture (Gram stain).
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Pasteurella multocida Numerous very small Gram-negative coccobacilli in
purulent sputum (Gram stain).
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Pasteurella multocida Small Gram-negative coccobacilli in culture
(Gram stain).
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Pseudomonas aeruginosa Encapsulated rods in purulent sputum. Pseudomonas is
morphologically indistinguishable from Enterobacte-riaceae (Gram stain).
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Pseudomonas aeruginosa Numerous rods in purulent sputum. Pseudomonas is
morphologically indistinguishable from Enterobacte-riaceae (Gram stain).
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Pseudomonas aeruginosa Numerous rods in purulent sputum. Pseudomonas is
morphologically indistinguishable from Enterobacte-riaceae (Gram stain).
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Pseudomonas aeruginosa Numerous rods in purulent sputum. Pseudomonas is
morphologically indistinguishable from Enterobacte-riaceae (Gram stain).
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Pseudomonas aeruginosa Gram-negative rods in culture, indistinguishable from
Enterobacteriaceae (Gram stain).
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Pseudomonas pseudomallei Gram-negative rods in culture (Gram stain).
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Salmonella heidelberg Gramnegative rods in a blood culture (Gram stain).
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Salmonella anderlecht Gramnegative rods in culture (Gram stain).
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Salmonella typhi The Eberth bacillus, a (Gram-negative) rod in a thick
smear (Giemsa stain).
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Serratia marcescens A few white blood cells and Gram-negative rods in
sputum (Gram stain).
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Serratia marcescens A few strains (often environmental in origin) produce
a red pigment (prodigiosin).
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Serratia marcescens Typical appearance around a colistin-disk (resistance):
partial growth within the zone of inhibition.
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Shigella boydii Gramnegative rods in culture (Gram stain).
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Shigella flexneri In the faeces of a patient with bacillary dysentery. The
smear shows a few granulocytic neutrophiles and Gram-negative rods (Gram stain).
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Stenotrophomonas maltophilia Numerous rods in purulent sputum. Stenotrophomonas
is morphologically indistinguishable from Enterobacteriaceae (Gram stain).
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Vibrio cholerae Curved, comma-shaped rods in a young broth culture
(Gram stain).
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Wautersia paucula Rod with several peritrichous flagella (Flagella stain).
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Yersinia enterocolitica Small Gram-negative coccobacilli in culture (Gram
stain).