所有职业都涉及到长期的(移居国外、工作轮换)或短期的(偶尔或重复多次)国际间的旅行。职业医学机构在劳务人员出发前直接与他们联系,提供咨询信息,进一步的预防措施以及预防接种(初级预防)。在其出国前或回国后,继续保持联系,收集个人健康资料(二级预防)。有可能的话,回国后安排病理学检查(三级预防),有时甚至 All occupations involve long-term (emigration, job rotation) or short-term (occasionally or repeatedly) international trips. The occupational medical institution contacts the labor force directly before departure, providing advice, further precautions and vaccinations (primary prevention). Before going abroad or after returning home, keep in touch and collect personal health information (secondary prevention). When possible, arrange a pathological examination after returning home (tertiary prevention) and sometimes even