That smallpox thing should be not big deal. Some of us oldsters were immunized as kids. We should have at least some minor immunity. (Don't we?)
Failing that... well, if I recall, the vaccine was developed from cowpox. Even if it's not currently available - there's a lot of cows in the world... I'm going to walk on thin ice with a dodgy idea here, and suggest that in the event of a smallpox apocalypse we deliberately infect the cows with cowpox then
(a) make vaccine, or
(b) milk them by hand, or
(c) just hang out on farms until we are immune
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