An intracellular pathogen uses one of three major strategies to survive and replicate once inside the host cell, as shown in the schematic drawing below. Indicate which strategy (1, 2, or 3) each of the following pathogens employs for this purpose. Your answer would be a three-digit number composed of digits 1 to 3 only, e.g. 332.

( ) Listeria monocytogenes
( ) Legionella pneumophila
( ) Shigella flexneri

Question

An intracellular pathogen uses one of three major strategies to survive and replicate once inside the host cell, as shown in the schematic drawing below. Indicate which strategy (1, 2, or 3) each of the following pathogens employs for this purpose. Your answer would be a three-digit number composed of digits 1 to 3 only, e.g. 332.
  
( )	Listeria monocytogenes
( )	Legionella pneumophila
( )	Shigella flexneri

Quizplus · Accepted Answer

Pathogens that follow strategy 1 include all viruses, the protozoan Trypanosoma cruzi, and the bacteria Listeria monocytogenes and Shigella flexneri. Those that follow strategy 2 include the bacterium Legionella pneumophila. Those that follow strategy 3 include protozoans of the Leishmania genus and the bacterium Salmonella enterica.

An Intracellular Pathogen Uses One of Three Major Strategies to Survive