在国际国内旅行途中或居留异地期间发生的腹泻称之为旅行腹泻 (ＴＤ)。ＴＤ是由细菌、病毒、肠道寄生虫等生物性致病因子所引起的一组急性肠道传染病。由于流行广泛 ,危害严重 ,现已成为全球性的一个至关重要的公共卫生问题 ,特别在发展中国家尤为突出。过去 ,一般人总认为ＴＤ Diarrhea that occurs during international and domestic travel or residence is called travel diarrhea (TD). TD is a group of acute intestinal infectious diseases caused by biological pathogenic factors such as bacteria, viruses and intestinal parasites. Because of its widespread prevalence and its pernicious nature, it has become a crucial global public health issue, especially in developing countries. In the past, most people always think TD