Sources to use in future:
Cocoliztli http://blogs.plos.org/publichealth/2013/07/30/guest-post-what-killed-the-aztecs/ http://www.ajtmh.org/content/62/6/733.full.pdf+html
Neith http://authors.library.caltech.edu/53320/1/PT.3.2583.pdf That book, if I could afford it.