Clostridium See Lecture Handouts Spores Clostridium form endospores
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Clostridium
See Lecture Handouts
Spores Ø Clostridium form endospores under adverse environmental conditions Ø Spores are a survival mechanism Ø Spores are characterized on the basis of position, size and shape Ø Most Clostridium spp. , including C. perfringens and C. botulinum, have ovoid subterminal (OST) spores Ø C. tetani have round terminal (RT) spores
Clostridium Associated Human Disease
Clostridium perfringens
Summary of C. perfringens Infections
Micro & Macroscopic C. perfringens NOTE: Large rectangular gram-positive bacilli NOTE: Double zone of hemolysis Inner beta-hemolysis = θ toxin Outer alpha-hemolysis = α toxin
Summary of C. perfringens Infections (cont. )
Clostridial Cellulitis
Minor Major C. perfringens Virulence Factors
Exotoxins Associated with C. perfringens Types A-E Major
C. perfringens Nagler Reaction NOTE: Lecithinase (α-toxin; phospholipase) hydrolyzes phospholipids in egg-yolk agar around streak on right. Antibody against α-toxin inhibits activity around left streak.
Clostridium tetani
Summary of C. tetani Infections
Summary of Clostridium tetani Infections (cont. )
Clostridium tetani Gram Stain NOTE: Round terminal spores give cells a “drumstick” or “tennis racket” appearance.
Clinical Forms of Tetanus
Opisthotonos in Tetanus Patient
Risus Sardonicus in Tetanus Patient
Mechanism of Action of Tetanus Toxin
Clostridium botulinum
Summary of C. botulinum Infections
Summary of C. botulinum Infections (cont. )
Mechanism of Action of Botulinum Toxin
Rates of Isolation of C. botulinum and Botulinum Toxin
Clostridium dificile
Summary of C. dificile Infections
Summary of C. dificile Infections (cont. )
Antibiotic. Associated Colitis Plaque
Antibiotic-Associated Colitis
C. dificile Virulence Factors
Other Clostridium
Virulence Factors Associated with Other Clostridium
REVIEW Clostridium
REVIEW
See Lecture Handouts REVIEW
Spores Ø Clostridium form endospores under adverse environmental conditions Ø Spores are a survival mechanism Ø Spores are characterized on the basis of position, size and shape Ø Most Clostridium spp. , including C. perfringens and C. botulinum, have ovoid subterminal (OST) spores Ø C. tetani have round terminal (RT) spores REVIEW
Review of Clostridium perfringens REVIEW
REVIEW
Micro & Macroscopic C. perfringens NOTE: Large rectangular gram-positive bacilli REVIEW NOTE: Double zone of hemolysis Inner beta-hemolysis = θ toxin Outer alpha-hemolysis = α toxin
Minor Major C. perfringens Virulence Factors REVIEW
Exotoxins Associated with C. perfringens Types A-E Major REVIEW
C. perfringens Nagler Reaction NOTE: Lecithinase (α-toxin; phospholipase) hydrolyzes phospholipids in egg-yolk agar around streak on right. Antibody against α-toxin inhibits activity around left streak. REVIEW
Review of Clostridium tetani
REVIEW
Clostridium tetani Gram Stain NOTE: Round terminal spores give cells a “drumstick” or “tennis racket” appearance. REVIEW
Clinical Forms of Tetanus REVIEW
Mechanism of Action of Tetanus Toxin REVIEW
Review of Clostridium botulinum
REVIEW
Mechanism of Action of Botulinum Toxin REVIEW
Review of Clostridium dificile
Summary of C. dificile Infections REVIEW
Summary of C. dificile Infections (cont. ) REVIEW
- Clostridium spores
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