Gram-Negative Cocci and Coccobacilli

Published on 18/02/2015 by admin

Filed under Allergy and Immunology

Last modified 18/02/2015

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Chapter 12

Gram-Negative Cocci and Coccobacilli

Neisseria Species

• Neisseria meningitidis and Neisseria gonorrhoeae are strict human pathogens; other Neisseria species are commonly present on mucosal surfaces.

Shared Neisseria properties

1. Structure

2. Growth and biochemical characteristics

N. meningitidis

1. Classification

2. Pathogenesis

3. Meningococcal diseases

• Meningococcal infection is most common in children younger than 5 years of age and in those with deficiency of terminal complement components (C5-C9).

• Meningitis

• Acute meningococcemia

• Waterhouse-Friderichsen syndrome

• Chronic meningococcemia

• Mild febrile disease with pharyngitis, pneumonia, arthritis, or urethritis

4. Transmission of N. meningitidis

5. Prevention

6. Treatment

N. gonorrhoeae