Clostridium See Lecture Handouts Spores  Clostridium form endospores under adverse environmental conditions  Spores are a survival mechanism  Spores.

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Presentation transcript:

Clostridium

See Lecture Handouts

Spores  Clostridium form endospores under adverse environmental conditions  Spores are a survival mechanism  Spores are characterized on the basis of position, size and shape  Most Clostridium spp., including C. perfringens and C. botulinum, have ovoid subterminal (OST) spores  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 Inner beta-hemolysis = θ toxin Outer alpha-hemolysis = α toxin NOTE: Double zone of hemolysis

Summary of C. perfringens Infections (cont.)

Clostridial Cellulitis

C. perfringens Virulence Factors Major Minor

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  Clostridium form endospores under adverse environmental conditions  Spores are a survival mechanism  Spores are characterized on the basis of position, size and shape  Most Clostridium spp., including C. perfringens and C. botulinum, have ovoid subterminal (OST) spores  C. tetani have round terminal (RT) spores REVIEW

Review of Clostridium perfringens REVIEW

Micro & Macroscopic C. perfringens NOTE: Large rectangular gram-positive bacilli Inner beta-hemolysis = θ toxin Outer alpha-hemolysis = α toxin NOTE: Double zone of hemolysis REVIEW

C. perfringens Virulence Factors Major Minor 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