Your Patient Has Just Returned to the East Coast of the U.S.from

Your patient has just returned to the east coast of the U.S.from a hiking/camping vacation,experiencing symptoms of an infection--high fever,swollen lymph nodes,black-and-blue marks or hemorrhages under the skin.Your doctor asks you if you have been in the four corners area of the U.S.--where the states of Arizona,Colorado,New Mexico,and Utah all meet.Why does the dcotor ask you this?

A) Since there are many mosquitoes in that area,the doctor thinks that you might have picked up the Plasmodium pathogen.
B) Those 4 states have a very high rate of yellow fever,which is what the doctor suspects that you have.
C) The doctor thinks that you might have picked up the plague bacterium from fleas that normally feed on rodents in that area.
D) Hemmorhagic fever is often associated with bats in that region of the U.S.