People with immune deficiencies, and people with eczema or other open sores on their skin can get over inoculated with the virus as it will take up residence in all open wounds. So people in the household or close friends of people who are vaccinated and shedding cow pox virus can be at risk if they have immune deficiencies from cancer treatment, transplant immunosuppression, steroid treatment, etc. Plus those with skin rashes and lesions are at risk.
To understand why we all got vaccinated back then you have to realize how great a killer small pox was and that the survivors were often terribly disfigured with scars.
That the U.S. and Britain are prepared to reintroduce vaccination tells you they must know something about what Saddam has been cooking up these past years. That to me is a terrible crime against humanity in itself and deserves the death penalty.