Abstract: The invention relates to a versatile disinfectant containing as main components, a metal ion having an antimicrobial action, L-cysteine and L-ascorbic acid, characterized in that it contains a surfactant excluding a nonionic surfactant in addition to these main components. The versatile disinfectant may further contain one or more compounds selected from the group consisting of sorbic acid, sorbates, benzoic acid, benzoates and p-hydroxybenzoate esters. The pH of the versatile disinfectant is preferably adjusted to 2.5 to 4.0. The disinfectant can disinfect an object to be treated for an environment, an apparatus, a human body, an animal body, a plant body, an organic matter or the like by bringing the disinfectant into contact with such an object to be treated.

Abstract: There has been effort to develop a lactobacillus that would be useful as a probiotic, and to develop a lactobacillus which would colonize and proliferate in lesions of infection, eliminating the causal bacteria. This problem was resolved by developing a Lactobacillus casei species having the following key properties. (1) The species can be grown in the presence of any of one to four amino acids as a nitrogen source necessary for growth. (2) When a growth-promoting culture medium is inoculated with the species and Escherichia coli in the same count and subjected to anaerobic mixed culturing at 37° C., the final count of lactobacilli is 50% or more of the coliform count. (3) Upon cultivation in an appropriate culture medium, the final pH value is 4.0 or below, and the highest acidity is 1.5% or more. (4) The species is resistant to 5% bile salts. (5) The species produces an antibiotic.

Abstract: A method for treating periodontal disease by first disinfecting the affected part with a bactericidal disinfectant containing ferric ions (Fe+3) and L-ascorbic acid as the principal components and one or more of sorbic acid, benzoic acid and para-hydroxybenzoic acid esters, and then injecting a preparation containing a Lactobacillus casei into the affected part. Antibiotics are contained in the preparation, for enhancing the therapeutic effects.

Abstract: There has been effort to develop a lactobacillus that would be useful as a probiotic, and to develop a lactobacillus which would colonize and proliferate in lesions of infection, eliminating the causal bacteria. This problem was resolved by developing a Lactobacillus casei species having the following key properties. (1) The species can be grown in the presence of any of one to four amino acids as a nitrogen source necessary for growth. (2) When a growth-promoting culture medium is inoculated with the species and Escherichia coli in the same count and subjected to anaerobic mixed culturing at 37° C., the final count of lactobacilli is 50% or more of the coliform count. (3) Upon cultivation in an appropriate culture medium, the final pH value is 4.0 or below, and the highest acidity is 1.5% or more. (4) The species is resistant to 5% bile salts. (5) The species produces an antibiotic.

Abstract: A method for treating periodontal disease by first disinfecting the affected part with a bactericidal disinfectant containing ferric ions (Fe3+) and L-ascorbic acid as the principal components and one or more members of the group consisting of sorbic acid, benzoic acid and para-hydroxybenzoic acid esters, and then injecting a preparation containing a novel Lactobacillus casei into the affected part, wherein antibiotics are contained in the preparation, for enhancing the therapeutic effects.