Answered: 5 μm FIGURE 26.3 Streptococcus…

5 μm FIGURE 26.3 Streptococcus pneumoniae (Pneumococci) This smear shows large numbers of the Gram-positive diplococci in concentrated CSF of a person with pneumococcal meningitis.

Comprehensive Medical Assisting: Administrative and Clinical Competencies (MindTap Course List)

6th Edition

ISBN:9781305964792

Author:Wilburta Q. Lindh, Carol D. Tamparo, Barbara M. Dahl, Julie Morris, Cindy Correa

Publisher:Wilburta Q. Lindh, Carol D. Tamparo, Barbara M. Dahl, Julie Morris, Cindy Correa

Chapter42: Basic Microbiology

Section: Chapter Questions

Problem 3CR

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Question

How would a Gram stain distinguish this organism from Neisseria meningitidis?

5 μm
FIGURE 26.3 Streptococcus pneumoniae (Pneumococci) This
smear shows large numbers of the Gram-positive diplococci in
concentrated CSF of a person with pneumococcal meningitis.

Definition Definition Technique that uses crystal violet or methylene blue as primary staining colors to distinguish gram-positive from gram-negative organisms. Under a microscope, the gram-positive organisms appear purple-brown, retaining the primary color. Gram-negative organisms appear pink or red as they do not acquire the color of the primary stain.

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