Which of the Following Is Not Correct Concerning the Plague

Multiple Choice

Which of the following is not correct concerning the plague?

A) Mice, voles, and other rodents are primary long-term reservoirs.
B) It is transmitted by flea vectors.
C) Less than 10 cases per year occur in the U.S.
D) The etiological agent is Yersinia pestis.
E) Strains of the plague bacillus are less virulent today compared to strains prevalent in the Middle Ages.