Which of the following factors is not considered important for the establishment of an infection? ...

Which of the following factors is not considered important for the establishment of an infection?
 
  A.
  Adherence
 
  B.
  Dose
 
  C.
  Toxicity
 
  D.
  Virulence factors

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Adhesins are
 
  A. involved in the first step of the infectious process.
  B. often found at the tip of pili.
  C. found in flagella.
  D. endotoxins.
  E. involved in the first step of the infectious process AND often found at the tip of pili.

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The first step in the establishment of infection is that the organism must
 
  A. invade host tissues.
  B. attach to host cells.
  C. evade phagocytes.
  D. produce toxins.

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Which of the following causes a foodborne intoxication?
 
  A. Staphylococcus aureus
  B. E. coli O157:H7
  C. Clostridium botulinum
  D. Mycobacterium tuberculosis
  E.
  Staphylococcus aureus, E. coli O157:H7, AND Clostridium botulinum

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If a disease affects only a human and not an animal, then it would be difficult to fulfill Koch's postulate number
 
  A. 1.
  B. 2.
  C. 3.
  D. 4.