Smallpox eradication was not due to’ Smallpox eradication was not due to  mcq  given below:

Q. Smallpox eradication was not due to

(a) Highly Effective vaccine
(b) cross immunity with animal Pox virus
(c) subclinical infection do not transmit the disease
(d) lifelong immunity

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Ans: (b) cross immunity with animal Pox virus
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