Which of the following diseases appeared as public health concerns in the last quarter of the 20th Century?

Which of the following diseases appeared as public health concerns in the last quarter of the 20th Century?

Which of the following diseases appeared as public health concerns in the last quarter of the 20th Century?










A) Escherichia coli O157:H7
B) HIV
C) Ebola virus
D) All of the above














Answer: D