Anaerobic Gram-Positive Spore-Forming Bacilli презентация

Содержание

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See Lecture Handouts

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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

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Clostridium Associated Human Disease

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Clostridium perfringens

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Summary of C. perfringens Infections

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Micro & Macroscopic C. perfringens

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Summary of C. perfringens Infections (cont.)

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Clostridial Cellulitis

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C. perfringens Virulence Factors

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Exotoxins Associated with C. perfringens Types A-E

Major

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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.

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Clostridium tetani

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Summary of C. tetani Infections

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Summary of Clostridium tetani Infections (cont.)

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Clostridium tetani Gram Stain

NOTE: Round terminal spores give cells a “drumstick” or “tennis

racket” appearance.

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Clinical Forms of Tetanus

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Opisthotonos in Tetanus Patient

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Risus Sardonicus in Tetanus Patient

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Mechanism of Action of Tetanus Toxin

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Clostridium botulinum

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Summary of C. botulinum Infections

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Summary of C. botulinum Infections (cont.)

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Mechanism of Action of Botulinum Toxin

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Rates of Isolation of C. botulinum and Botulinum Toxin

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Clostridium dificile

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Summary of C. dificile Infections

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Summary of C. dificile Infections (cont.)

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Antibiotic-Associated Colitis

Plaque

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Antibiotic-Associated Colitis

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C. dificile Virulence Factors

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Other Clostridium

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Virulence Factors Associated with Other Clostridium

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REVIEW
Clostridium

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See Lecture Handouts

REVIEW

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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

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Review of Clostridium perfringens

REVIEW

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Micro & Macroscopic C. perfringens

REVIEW

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C. perfringens Virulence Factors

REVIEW

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Exotoxins Associated with C. perfringens Types A-E

Major

REVIEW

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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

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Review of Clostridium tetani

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Clostridium tetani Gram Stain

NOTE: Round terminal spores give cells a “drumstick” or “tennis

racket” appearance.

REVIEW

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Clinical Forms of Tetanus

REVIEW

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Mechanism of Action of Tetanus Toxin

REVIEW

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Review of Clostridium botulinum

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Mechanism of Action of Botulinum Toxin

REVIEW

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Review of Clostridium dificile

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Summary of C. dificile Infections

REVIEW

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Summary of C. dificile Infections (cont.)

REVIEW

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