Answer to Question 1
D, A, E, C, B
For a susceptible host to be infected, there must be an infectious organism, a reservoir, a portal of exit, a transmission mode, and a portal of entry.
Answer to Question 2
2
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1. The truncal valve remains open, so these signs and symptoms will not be noted.
2. The PDA must remain open to allow the oxygen from the pulmonary veins to move to the left atrium.
3. Transposition causes cyanosis, but does not lead to shock.
4. An ASD does not lead to shock.