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Canani et al enrolled children with acute diarrhoea in their study of probiotics, but the cause of the diarrhoea was not mentioned.1 I assumed that the cause was infection or food poisoning, as other causes such as food allergy or cystic fibrosis were excluded. However, microbiological examination was performed only when there were specific clinical reasons, so that no complete information was available.1 Although a Cochrane review showed therapeutic benefit regardless of organism,2 microbiological examination might be of additional value. The specific micro-organism might have had an effect on whether or not the probiotic preparations were successful. In other words, microbial causes might interfere with the result. Moreover, probiotics should be used cautiously in children. Sepsis caused by Lactobacillus GG has been reported in two children in hospital who had diarrhoea as a result of antibiotic treatment for other diseases.3
Competing interests: None declared.