Steffen R, van der Linde F, Meyer H E
Schweiz Med Wochenschr. 1978 Sep 30;108(39):1485-95.
A survey on rate of illness among 10 500 tourists returning from the tropics and a control group of 1300 from the United States and Canada was performed by a questionnaire completed during the flight back to Switzerland. Only 25% from southern destinations, but 53% from North America, were never incapacitated during their travels. The vast majority of the illnesses were of no consequence, as was reflected by a low rate for bed confinement of 4% and 1% respectively. The most frequent symptoms in the tropics were diarrhea in 34% (mostly of short duration and mild degree), constipation in 14%, upper respiratory illness in 12% and insomnia in 11%. There were significant differences according to sex, age and tropical experience. The influence on pre-existing diseases was assessed. 7% of the tourists returning from the tropics were sick in the course of the year following the journey.
通过在返回瑞士的航班上填写问卷，对10500名从热带地区返回的游客以及1300名来自美国和加拿大的对照组人员进行了疾病发生率调查。只有25%来自南方目的地的游客以及53%来自北美的游客在旅行期间从未丧失过能力。绝大多数疾病并无大碍，这一点体现在卧床限制率分别为4%和1%的低水平上。在热带地区最常见的症状是腹泻，占34%（大多持续时间短且程度轻微），便秘占14%，上呼吸道疾病占12%，失眠占11%。根据性别、年龄和热带地区经历存在显著差异。评估了对原有疾病的影响。从热带地区返回的游客中有7%在旅行后的一年中患病。
