ID:IOTS - Infectious Disease Insight Of Two Specialists 19. Neiserria knowledge
Apr 4, 2022
Explore the fascinating world of Neisseria, focusing on the notorious Neisseria meningitidis and Neisseria gonorrhoeae. Discover their historical impact on health and the urgent need for early recognition and treatment. Learn about laboratory identification challenges while uncovering the role of advancements like MALDI-TOF technology. The conversation also dives into the importance of PCR testing and the challenges of antibiotic resistance, highlighting the interconnectedness of these pathogens with public health and the dire implications of asymptomatic carriage.
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Recognize Neisseria On Rapid Tests
- If you see gram-negative diplococci on a Gram stain and oxidase/catalase are positive, think Neisseria first.
- Neisseria genus is dominated clinically by N. meningitidis and N. gonorrhoeae and other species are usually harmless commensals.
Carriage Versus Invasive Meningococcus
- Meningococcal carriage is common and peaks in adolescents, but invasive disease often follows exposure to a new strain.
- Carriage (8–25% adults) usually doesn't cause disease unless host immunity or strain virulence allows invasion.
What Drives Meningococcal Invasion
- Host factors (age, smoking, viral URIs, closed communities, complement/asplenia) and bacterial factors (pili, capsule, LOS, opacity proteins) determine invasion risk.
- Capsules and type IV pili are key virulence markers for invasive meningococcal disease.