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  A bacterial disease previously known to only infect dogs begins to cause respiratory infections in humans who are in close contact with infected dogs. Which of the following is the most likely explanation for the emergence of this new human pathogen?  

  Shiga toxin is an AB exotoxin.  If the B portion of the toxin is removed,  

  When comparing sexual reproduction to asexual reproduction, the advantage of sexual reproduction is that it  

  Why is it often more difficult to treat infections caused by eukaryotic microbes in humans than it is to treat bacterial infections?  

  Pathogens that recognize similar receptors among different hosts would most likely  

  The graph below shows the percent mortality in populations of lab animals exposed to increasing concentrations of two different pathogens (agent 1 and agent 2). Which of the following is a true statement about the LD50?  

  Antigenic drift occurs when  

Match the scenario/description with the best fitting ‘Pathogen to Know’ agent.

  Dennis, a 50-year-old man, was hospitalized with dizziness, blurred vision, slurred speech, difficulty swallowing, and nausea. Examination revealed facial paralysis. He reported eating home-canned green beans 24 hours before the onset of his symptoms. Dennis should first be treated with  

  Which of the following organisms is NOT transmitted by direct fecal-oral contact?