Give Reasons for the following : It is a known fact that, “milkmaids who had cowpox did not catch smallpox even during epidemics”. Why is it so?

Question

Philoid · Accepted Answer

The reason behind is that the structure of cowpox is quite similar to that of smallpox and as such the antibodies developed during the infection of cowpox is able to fight against smallpox. This in turn prevents the occurrence of the disease.

Give Reasons for the following :It is a known fact that, “milkmaids who had cowpox did not catch smallpox even during epidemics”. Why is it so?

Give Reasons for the following :
It is a known fact that, “milkmaids who had cowpox did not catch smallpox even during epidemics”. Why is it so?