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Which mechanism is responsible for botulism in infants caused by Clostridium botulinum?

What organism most commonly causes gas gangrene?

Of the following, what disease does Clostridium perfringens cause?

A nonspore-forming, slender gram-positive rod forming palisades and chains was recovered from a vaginal culture and grew well at a decreased pH.  The most likely identification is

An anaerobic gram positive bacillus that displays terminal spores on gram stain and swarms on agar when it grows is most likely

Of the following genera of anaerobic cocci, which one will stain Gram negative?

Material from a brain abscess is suspected to contain Bacteroides species.  Isolation of this organism is best accomplished by

What test(s) can be used to presumptively identify/differentiate Peptostreptococcus species?

Cycloserine cefoxitin fructose agar (CCFA) is selective for

What are the proteins that make up the anthrax toxin? How do they cause disease in the patient?