What is the most likely reason that bats, raccoons, and foxes readily become infected with the rabies virus, whereas opossums are resistant to infection?
A. The rabies virus is unable to replicate once it has entered the opossum cells.
B. Infected opossums do not shed rabies virus in their saliva.
C. Opossums rarely contact other infected animals.
D. Opossums lack the appropriate receptor for the rabies virus.
Answer: D
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