MBIO 3812 Ex 3-9 Capsule stain

MBIO 3812 Ex 3-9 Capsule stain - MBIO 3812 Ex 3-9 Capsule...

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11 MBIO 3812 Ex 3-9 Capsule Stain CAPSULE = a complex layer of sugars and proteins that tightly surrounds a bacterium NOT all bacteria have capsules so the presence/absence of a capsule can be used to DIFFERENTIATE bacterial species
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22 MBIO 3812 Ex 3-9 Capsule Stain Role of a capsule: 1. Protecting the bacterium against harsh environmental conditions and dehydration 2. Helps the bacterium adhere to the surface of an object (e.g., the wall of a catheter tube) 3. Helps prevent phagocytosis of bacteria by macrophages In pathogenic bacterial species a capsule is considered a virulence factor Non-pathogenic bacteria can also possess capsules
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MBIO 3812 Ex 3-9 Capsule Stain What bacteria have a capsule? Examples : Neisseria meningitidis - a pathogen that causes meningococcal meningitis. This disease is fairly rare in the U.S. but is prevalent in Africa. A 1996 epidemic in West Africa killed 25,000 people. Many different
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MBIO 3812 Ex 3-9 Capsule stain - MBIO 3812 Ex 3-9 Capsule...

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