From the CDC: New Country-Specific Recommendations for Pre-Travel Typhoid Vaccination.
Johnson, Katherine J.; Gallagher, Nancy M.; Mintz, Eric D.; Newton, Anna E.; Brunette, Gary W.; Kozarsky, Phyllis E.; Journal of Travel Medicine, 2011, vol. 18, issue 6, p 430, ISSN 11951982. ISBN 17088305.

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