The CDC publishes The Yellow Book every two years. It is a reference book with advice for international travelers about possible health risks. While the book is meant for health care professionals, it can be a great resource for anyone. It can be purchased at online stores like Amazon. A Kindle version is even available.
For those that don't need a reference copy on their desk, the entire contents of the book is available online. Just click the link for Table of Contents under the heading Access the 2012 Yellow Book online.
And don't forget to check the CDC's Travelers' Health site if you'll be traveling soon. Take a glance at Travel Notices to see if there is something new in a country you will be visiting. Also take a look at Destinations to read medication and vaccination recommendations for the area you'll be in.