Smallpox can't be triggered by the vaccine, since it's cowpox. Much of any potential hysteria can be pre-empted with that information.
Stay well - Stay safe - Stay armed - Yorktown
Smallpox vaccine is not based on cowpox. It uses a different virus. The article implied it would be pretty easy to make a bunch of cowpox and use that to protect against smallpox in the absence of special-purpose vaccine, but that cowpox wouldn't work as well as the special-purpose vaccine designed for use against smallpox.