Development of new vaccines has slowed in recent decades. This is due to
A) the ineffectiveness of vaccines against disease.
B) the availability of vaccines against nearly all serious diseases.
C) the high cost of development.
D) the high level of risk with immunization.
E) a lack of need with modern medical treatments.

Question

Quizplus · Accepted Answer

The high cost of development has been a major contributing factor to the slowing development of new vaccines in recent decades.

Development of New Vaccines Has Slowed in Recent Decades