henry malnick, november 2012
TRANSCRIPT
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Henry Malnick, November 2012
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The Pitfalls of Identification
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Chadwick, P.R., et al. (1995) Haemophilus paraphrophilus
infection: a pitfall in laboratory diagnosis.
J. Infect (1995) 30: 67-69.
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Gram-negative catalase negative oxidasepositive bacteria
Cardiobacterium hominisEikenella corrodens
Kingella denitrificansKingella kingae
Suttonella (Kingella) indologenesNeisseria elongata ss nitroreductans
Aggregatibacter aphrophilus (Haemophilusaphrophilus/paraphrophilus)
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ONPG Lysine Ornithine NO3 red.
NO2 red.
Gas from NO2 red.
indole β-haem
E. corrodens - + + + - - - -
N. elongate ss nitroreductans
- - - + + - - -
Kingella denitrificans
- - - + + + - -
Kingella kingae - - - - - - - +
Cardiobacterium spp. *
- - - - - - + -
Suttonella indologenes*
- - - - - - + -
Aggregatibacter spp.
V V V + - - V V
*Cardiobacterium produce acid from sorbitol/mannitol, Suttonella are negative
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Actinobacillus sp. Aggregatibacter aphrophilus Haemophilus influenzae Haemophilus parainfluenzae Haemophilus sp. Kingella sp. Moraxella sp. Pasteurella multocida, Pasteurella sp.
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Kingella kingae
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Misleading clues Colony morphology Gram stain Cell morphology Atypical biochemical test results
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Gram-positive bacteria submitted as gram-negative bacteria
Arcanobacterium haemolyticum
Aerobic spore bearers (Brevibacillus, Paenibacillus)
Clostridium tertium
Leifsonia (Corynebacterium) aquaticum
Exiguobacterium acetylicum
Microbacterium spp.
Propionibacterium acnes
Streptococcus spp.
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Capnocytophaga
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Leptotrichia spp.
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Vancomycin Gram-positive resistant rods Lactobacillus, Erysipelothrix Gram-negative sensitive rods/coccobacilli Moraxella, Acinetobacter
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Aerobic spore bearers identifying as Sphingomonas paucimobilis
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A Case of Mistaken Identity
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Burkholderia pseudomallei
Pseudomonas aeruginosa
Pseudomonas fluorescens
Burkholderia cepacia complex
Chromobacterium violaceum
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Containment level 2 organisms identifying as containment level 3
Morganella morganii and Aggregatibacter
actinomycetemcomitans identifies as Burkholderia mallei
Chryserobacterium spp. identifies as Francisella tularensis
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Acknowledgement for the Lactobacillus photographs Shila Seaton, Elizabeth Fagan (QAL)
Acknowledgement for the Bacillus photographs
Ijeoma Nwafor, Obioma Mpamugo, Nafeesa Hussain (Bacillus Reference Unit, HPA Colindale)
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