Multiple choice questions XVII — task. Science CBSE, Class 9.

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1. It was found that milkmaids who had cowpox did not suffer from smallpox later?

Since the smallpox virus is closely related to the cowpox virus
Since smallpox is more deadly than cowpox
Since cowpox is more deadly than smallpox
Scientists have not yet worked out the reason for this

2. Name two diseases caused by the virus

Polio, chickenpox
Tuberculosis, typhoid
Malaria and amoebiasis
Scabies and skin infection

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