Which of the Following Explains Why Contagious Infections Are Becoming

Which of the following explains why contagious infections are becoming a central focus of public health? (Select all that apply.)

A) Americans are fearful of terrorists using biological agents.
B) Awareness of human susceptibility to animal diseases has been publicized.
C) Drug-resistant strains of "old" diseases have evolved.
D) Media coverage exaggerates the dangers of exposure to crowds.