The Prevention of Smallpox:
The smallpox virus has a vaccine composed of a different strain closely related to the smallpox virus. The vaccine can be administered up to six days after exposure, and often leaves an itchy red bump in place of the mark for about four days. The vaccination has risks, such as infections of the heart and brain, however, if an outbreak were to ever occur again the vaccination would be the best option.
Is There a Future for Smallpox?
At this point in time, there is luckily almost no future for smallpox, due to its eradication in 1980. The only way for it to pose a threat is during biological warfare against Russia, the only other country to contain the vicious virus. Seeing as that is unlikely, and any escape from the fourth level of containment is near impossible, we will not see smallpox again. Though currently, less than half of the population is vaccinated, however, if it ever were to pose a threat, stashes of the vaccination (the vaccination that builds up antibodies against the virus) would be distributed.