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The regions of the world are based on "List of Countries by
Region" from the CDC publication "Health Information for
International Travel 2003-2004." Each country of the world is assigned to
one of 16 regions. The regions and countries are also listed on the CDC
website: http://www.cdc.gov/travel/destinat.htm.
Regions
of the World
 | Australia and South Pacific |
| East Asia |
| Indian and South Asia |
| Southeast Asia |
| North America |
| Mexico, Central America, and Caribbean |
| Tropical South America |
| Temperate South America |
| North Africa |
| Southern Africa |
| West Africa |
| Central Africa |
| East Africa |
| Middle East |
| Western Europe |
| Eastern Europe and Former USSR |
If the patient lives in the United States and has not traveled, limit your query
to diseases endemic to North America. If the patient has traveled recently, add
all visited countries as criteria in an OR search (Any of these).
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