Steffen R, van der Linde F
Aviat Space Environ Med. 1981 Jan;52(1):57-8.
Over 12,000 European air passengers were interviewed as to whether the status of any pre-existing illness changed as a result of their vacation in the tropics or in North America (United States or Canada). Of the travelers to tropical destinations, 1.6% reported their disease had improved, which significantly exceeded the rate of 0.5% in visitors to North America, mainly due to a more favourable influence in chronic respiratory tract infections and chronic rheumatologic impairment. Aggravation of pre-existing disease occurred in 0.9 and 0.7%, respectively, of the travelers in the two groups and was only rarely severe. In the tropics, patients below the age of 30 and those who suffered from digestive problems were most frequently adversely affected.
超过12000名欧洲航空乘客接受了询问，了解他们是否因在热带地区或北美（美国或加拿大）度假而使任何原有疾病的状况发生了变化。在前往热带目的地的旅行者中，1.6%报告称他们的疾病有所改善，这显著超过了前往北美游客0.5%的改善率，主要是因为对慢性呼吸道感染和慢性风湿性损伤有更有利的影响。两组旅行者中分别有0.9%和0.7%的人原有疾病加重，且很少有严重情况。在热带地区，30岁以下的患者和患有消化问题的人受不良影响最为频繁。
