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  Which of the following is NOT a possible effect of viral infection of a host cell?  

  Blood and fecal samples are collected from a man with dysentery to determine the causative agent and appropriate treatment.  An amebic infection is suspected.  Which of the following lab results would most clearly indicate an amebic infection?  

  Viruses can infect  

  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