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?

Scientists have not yet worked out the reason for this
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

2. Name two diseases caused by the virus

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

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