Here's a death, from measles, in a first-world country (Germany) with access to modern health-care:
http://www.bbc.com/news/world-europe-31585047
There, as I have stated repeatedly, is your threat.
regardless of whether or not the disease was contracted from someone who was unvaccinated the rate of vaccination needs to stay above 94% or 95% otherwise herd immunity begins to break down, out-breaks become more common and (obviously) as a consequence of that, we begin to see an increasing number of deaths.