Cyclic variations in the occurrence of pneumonia and influenza mortality may reflect:
A) seasonal variations in cases of influenza.
B) the fact that influenza is a disappearing disorder.
C) long-term changes in mortality trends.
D) seasonal variations in cases of influenza and the fact that influenza is a disappearing disorder.

Question

Quizplus · Accepted Answer

Cyclic variations in pneumonia and influenza mortality are primarily due to seasonal variations, as influenza cases typically increase during colder months.

Cyclic Variations in the Occurrence of Pneumonia and Influenza Mortality