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  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?  

  Chlamydiae is a large group of bacteria with cell walls that have very little __________.  

  All of the following are transmitted via the respiratory route EXCEPT  

  Microbiologists are still identifying different types of microbes that make up the human microbiome because traditional microbial growth media only allows for the growth of 0.1% of all microorganisms in pure culture in the laboratory.  Provide two reasons why our ability to grow microorganisms in laboratory culture is so limited.  

  Herpes virus rapidly replicates in __________ cells and develops a latent state in __________ cells.  

  How do mycelia increase in size?