title: Study of illness among Americans returning from international travel, July 11-August 24, 1971. (preliminary data).
mesh_terms: D000349:Africa; D001315:Australia; D002489:Central America; D005060:Europe; D005759:Gastroenteritis / Q000453:epidemiology; D006505:Hepatitis / Q000453:epidemiology; D006760:Hospitalization; D006801:Humans; D007114:Immunization; D007557:Israel; D008800:Mexico; D009017:Morbidity; D012140:Respiratory Tract Diseases / Q000453:epidemiology; D013020:South America; D011795:Surveys and Questionnaires; D013997:Time Factors; D014195:Travel; D014435:Typhoid Fever / Q000453:epidemiology; D014481:United States