It's nice to know that people put research into their stories

Australia has a little site called the "Australian Bureau of Statistics" and it took me 2 minutes to find the stats for reported Chlamydial infections. (I put in the URL's incase you're interested)

As for Mexican statistics... Google is your friend.
http://www.paho.org/english/HIA1998/Mexico.pdf
Those are from 1995, just search for Chlamydia.

http://www.uthscsa.edu/rchws/Reports/NAFTA2.pdf
Here's some a bit more recent, although there's one hell of a lot of stuff to wade through. What you want is in Chapter 3.

Hope this helps