The growth of Hiochi-bacteria in SI-media containing antibiotics were investigated. All of the Hiochi -bacteria tested were able to grow in the presence of 20μg/m l of aminoglycoside and polypeptide antibiotics. Both hetero-fermenters of hiochi-lactobacilli and true hiochi-bacilli were able to grow in the presence of tetracycline more than 20μg/m l , but none of the homo-fermenters of the same groups could grow at 5μg/m l of tetracycline.