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16 Cards in this Set
- Front
- Back
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What 2 main types of Gram negative cocci are there?
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Neisseria & Veillonella
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What are the 2 types of pathogenic Neisseria?
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1. Meningococcus (N. meningitides)
2. N. gonorrhoeae |
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N. meningitides: What diseases does it cause?
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Meningitis and bacteremia.
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N. meningitides: Does it have a polysaccharide capsule?
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Yes.
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How does N. meningitides secrete endotoxin?
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Sheds vesicles containing polysaccharide from its outer membrane.
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N. gonorrhoeae: Does it have a polysaccharide capsule?
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No.
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N. gonorrhoeae: What disease does it cause?
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Gonorrhea.
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Neisseria: Pathogenic varieties and ___________ varieties.
What areas are they associated with? |
commensal
Upper respiratory and alimentary tracts. |
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What is unique about N. gonorrhoeae?
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Always occurs in pairs (diplococcic).
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N. Gonorrhoeae: We often see recurrent infections, why?
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Because of changes in proteins that are expressed on the outer membrane (Antigenic variation).
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What are three species of Veillonella?
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1. V. parvula
2. V. dispar 3. V. atypica |
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Veillonella: Aerobic or anaerobic?
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Anaerobic.
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Which is diplococcic, Neisseria or Veillonella?
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Neisseria.
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Where are Veillonella most predominant in the body?
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Saliva and tongue surfaces.
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This type of bacteria is usually called a 'beneficial' bacteria. What is it and why is it called that?
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Veillonella.
B/c it metabolizes lactic acid in our mouths-converting it to acetic and propionic acids (raises carious pH levels). |
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What is unique about the surface markers of gonococci?
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Antigenic Variation. Same genes present, but different genes are expressed within the same organism over time.
Leads to multiple infections. |
