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Citation: Ledeboer N, Doern G. .

Key Concept Ranking

Lower Respiratory Tract Infections
Restriction Fragment Length Polymorphism
Outer Membrane Protein D
Nucleic Acid Amplification Techniques
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Image of FIGURE 1

Electron micrographs depicting an encapsulated type b strain (left) and a nonencapsulated, nontypeable strain (right) of .

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Image of FIGURE 2

Gram stain of present in CSF.

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Image of FIGURE 3

Colony morphologies of type b encapsulated (left) and nonencapsulated (right) strains of when propagated on enriched chocolate agar.

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Image of FIGURE 4

Colony morphologies of type b encapsulated (left and right) and nonencapsulated (center) strains of when propagated on Levinthal's agar. Note the conspicuous iridescence apparent with the encapsulated strain.

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Image of FIGURE 5

Colony growth from an expectorated-sputum specimen containing from a patient with cystic fibrosis propagated on enriched chocolate agar (left) and enriched chocolate agar

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Image of FIGURE 6

Satellite phenomenon observed when is propagated next to a streak of on a 5% sheep blood agar plate.

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Image of FIGURE 7

Use of X and V factor disks and strips in determining the growth factor requirements of Haemophilus influenzae (left disks) and H. parainfluenzae (right disks).

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Image of FIGURE 8

Positive (top) and negative (bottom) porphyrin tests.

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Image of FIGURE 9

Conventional biochemicals depicting positive and negative reactions for indole, urease, and ornithine decarboxylase production (left to right) by spp.

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Generic image for table

Differential characteristics of species

Indole, urease, and ornithine decarboxylase production are the basis for biotyping schemes with and as depicted in Table 2 .

A delayed positivereaction occurs in more than 90% of strains.

Delayed development of hemolysis occurs in 11 to 89% of strains.

Elevated concentrations of CO of ≥10% enhance growth.

+, positive; –, negative; v, variable reaction; w, weak reaction; uk, unknown.

Generic image for table

Biotypes of Haemophilus influenzae and H. parainfluenzae


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