[Antibiotic sensitivity of Lactobacilli from the digestive tract of the crews of Soiuz-13 and Saliut-4].

Sensitivity to 19 antibiotics of 411 lactobacillus strains isolated from the saliva and feces of crewmembers who made 8-, 30- and 63-day flights was determined. Antibiotic sensitivity remained unchanged even in the 63-day flight. The antibiotics tested produced different effects on the lactoflora that varied from gentle--polymyxin and gentamycin, less gentle--neomycin and monomycin, to hazardous--penicillin and erythromycin, then rifampicin and levomycetin, and, finally, tetracycline and oleandomycin.