This subject is only going to get more important. As authors say: "Access to specialists in tropical medicine is limited".
The US organisation Center for Disease Control maintains an outstandingly detailed website with up to date information about health (and non-health) hazards in every country in the world.
I use it mainly to check whether or not malaria can be caught in an area. The information is very detailed indeed. For instance advice about malarial risks in Brazil gives details of individual states and includes this passage "Travellers who will only visit the coastal states from the "horn" south to the Uruguay border including Iguassu Falls, are not at risk and need not take preventive drugs".
The website is at http://www.cdc.gov/travel/travel.html
Competing interests: No competing interests