Based on what I was hearing on some morning podcasts the other day (sorry, no citation handy, but it was something mainstream...NPR perhaps), the smallpox vacci

Based on what I was hearing on some morning podcasts the other day (sorry, no citation handy, but it was something mainstream...NPR perhaps), the smallpox vaccine was something like 75% effective against monkeypox. Which makes it MORE effective than the MMR is against things like mumps (which my wife found out the hard way a couple years back has only a roughly 70% efficacy).