Which of the following was LEAST likely to have influenced the decline in mortality in the United States prior to World War II?
A) Improved diet
B) Better hygiene
C) Availability of penicillin
D) Availability of smallpox vaccinations

Question

Quizplus · Accepted Answer

Penicillin was not widely available until after World War II, so it was least likely to have influenced the decline in mortality in the United States prior to the war.

Which of the Following Was LEAST Likely to Have Influenced