NPR's Gerry Hadden reports from Mexico City on efforts to fight the spread of the AIDS virus, especially among the migrant worker population. Six cross-border programs have been established to provide educational and other resources, but researchers say migrant laborers who contract the virus in the United States and then come home to their families, often spread the virus deep inside Mexico, to areas where there are no AIDS programs. The campaign to halt the spread of AIDS also is hindered by cultural taboos that make it difficult to educate the population and change people's behavior.
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