Gallstone diseases are old disease entities, it yet remains the most prevalent disease affecting the biliary system. 摘要胆石症虽然是一个古老疾病，但仍然是胆道疾病中最常见。
Cryptosporidium is an intracellular parasitic protozoan that can cause severe disease in a wide variety of young animals, children and immunocompromised persons. 摘要隐孢子虫是一种重要的人兽共患寄生性原虫，可引起儿童和免疫低下人群以及幼龄动物发生严重胃肠道疾病。
