The opinion that Konnyaku mannan is not digested in the digestive canal system of the higher class animals is nearly consistent. Formerly the author isolated 2 strains of coliform bacteria which decompose Konnyaku mannan from among 32 strains of coliform group, which were is olated from sent 8 samples of human feces. Their properties and statuses were tested and identified to be Aerobacter cloacae form.
In this report were tested frequency of appearance of Aerobacter group and Konnyaku mannan decomposing Aerobacter group and biological properties of the isolated strains.
Ratio of appearance of Konnyaku mannan decomposing Aerobacter group to Aerobacter group varies between 1/10 and 1/100, and the majority lies in approximately 1/100.
All of the isolated bacteria are lactose fermentable and non spored bacteria, and IMVIC system (Paar) is--++. They belong to the Aero acter cloacae type. It is suggested that this variety of Aerohacter cloacae group exists in human intestines, decomposes Konnyaku mannan and contribute to human nutrition. It is evident that intestinal bacteria in human being are not foreign element material nor symbiotic existence, but conjugative existence.