After infection with the disease , the body -LRB- usually -RRB- gains the ability of recognizing the similar smallpox virus from its antigens and so is able to fight the smallpox disease much more efficiently .

After infection with the disease , the body -LRB- usually -RRB- gains the ability recognise the similar smallpox virus from its antigens and so is able to fight the smallpox disease much more efficiently .
