Stoney, Rhett J.Jentes, Emily S.Sotir, Mark J.Kozarsky, PhyllisRao, Sowmya R.Larocque, ReginaRyan, Edward2014-04-112014Stoney, Rhett J., Emily S. Jentes, Mark J. Sotir, Phyllis Kozarsky, Sowmya R. Rao, Regina C. LaRocque, and Edward T. Ryan. 2014. “Pre-Travel Preparation of US Travelers Going Abroad to Provide Humanitarian Service, Global TravEpiNet 2009–2011.” The American Journal of Tropical Medicine and Hygiene 90 (3): 553-559. doi:10.4269/ajtmh.13-0479. http://dx.doi.org/10.4269/ajtmh.13-0479.0002-9637http://nrs.harvard.edu/urn-3:HUL.InstRepos:12064368We analyzed characteristics of humanitarian service workers (HSWs) seen pre-travel at Global TravEpiNet (GTEN) practices during 2009–2011. Of 23,264 travelers, 3,663 (16%) travelers were classified as HSWs. Among HSWs, 1,269 (35%) travelers were medical workers, 1,298 (35%) travelers were non-medical service workers, and 990 (27%) travelers were missionaries. Median age was 29 years, and 63% of travelers were female. Almost one-half (49%) traveled to 1 of 10 countries; the most frequent destinations were Haiti (14%), Honduras (8%), and Kenya (6%). Over 90% of travelers were vaccinated for or considered immune to hepatitis A, typhoid, and yellow fever. However, for hepatitis B, 292 (29%) of 990 missionaries, 228 (18%) of 1,298 non-medical service workers, and 76 (6%) of 1,269 medical workers were not vaccinated or considered immune. Of HSWs traveling to Haiti during 2010, 5% of travelers did not receive malaria chemoprophylaxis. Coordinated efforts from HSWs, HSW agencies, and clinicians could reduce vaccine coverage gaps and improve use of malaria chemoprophylaxis.en-USJournal Article2014-04-1110.4269/ajtmh.13-0479