1. Minimise exposure to mosquitoes and avoid bites.
2. Know areas of risk:
o tropical South America (southern Mexico to northern half South America) o tropical Africa (sub-Sahara to northern South Africa) o Nile region including Egypt o Southern Asia especially tropical areas
3. Know areas of widespread chloroquine resistance:
o Asia, tropical South America (rare north of Panama Canal), sub-Sahara, East Africa
4. Consider several factors:
o intensity of transmission o season and length of stay o itinerary
■ rural—backpacking o resistance patterns o host factors
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