Which of the following did NOT play a role in the eradication of smallpox?单项选择题

题目图片
A

a. The availability of effective antiviral agents that block replication

B

b. The World Health Organisation organised and led a global eradication plan

C

c. No known reservoir outside of human hosts

D

d. Ease of diagnosis by readily recognized clinical features

E

e. An effective vaccine was produced

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