Viral gastroenteritis It is thought that viruses are responsible for up to 3/4 of all infective diarrhoeas Viral gastroenteritis is the second most common viral illness after upper respiratory tract infection
Mycoplasmas a group of the smallest organisms that can be free living in nature, Pass bacterial filter and also grow on laboratory media. More than 80 species, belong to Mycoplasmatales of mollicute. 3 families can be divided:
brucella The genus Brucella consists of six species four of which cause human brucellosis Afj 鲁菌病: Brucella melitensis羊布鲁菌, Brucella suis猪布鲁菌, Brucella abortus 牛布鲁菌, and brucella canis犬布鲁菌 Are all intracellular organisms .B neotomaeB ovis