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The protozoan <i>Cryptosporidium parvum</i> is one of the major causative pathogens of diarrhoea in young ruminants; therefore, it causes economic losses and impairs animal welfare. Besides <i>C. parvum</i>, there are many other non-infectious and infectious factors, such as rotavirus, <i>Escherichia coli</i>, and <i>Giardia duodenalis</i>, which may lead to diarrhoeic disease in young livestock. Often, more than one infectious agent is detected in affected animals. Little is known about the interactions bet-ween simultaneously occurring pathogens and their potential effects on the course of disease. In this review, a brief overview about pathogens associated with diarrhoea in young ruminants is presented. Furthermore, information about coinfections involving <i>Cryptosporidium</i> is provided.