title: Summary of study on illness among Americans visiting Europe, March 31, 1969-March 30, 1970.
mesh_terms: D005060:Europe; D005260:Female; D005759:Gastroenteritis / Q000453:epidemiology; D006505:Hepatitis / Q000453:epidemiology / Q000517:prevention & control; D006801:Humans; D007114:Immunization; D008297:Male; D008521:Mediterranean Islands; D009017:Morbidity; D012141:Respiratory Tract Infections / Q000453:epidemiology; D012621:Seasons; D011795:Surveys and Questionnaires; D013997:Time Factors; D014195:Travel; D014435:Typhoid Fever / Q000453:epidemiology; D014481:United States; D014611:Vaccination