combined effects of the bacteriocin-like inhibitory substances of vaginal lactobacillus against group b streptococcus

Lactobacillus species, which are beneficial and non-pathogenic gram-positive rods, are commonly found in the vaginal microbiota of healthy premenopausal women. these bacteria play a crucial role in maintaining vaginal health by producing substances that inhibit the growth of harmful microorganisms. the purpose of this study was to assess the prevalence and incidence of group b streptococcus (gbs), a significant pathogen associated with neonatal infections and other health risks, among pregnant women in wukari, a town in taraba state, nigeria. in addition, the study aimed to explore the ability of bacteriocins—antimicrobial peptides produced by lactobacillus species—to inhibit a broad spectrum of both gram-positive and gram-negative bacteria. to achieve this, a total of 50 samples were collected from pregnant women in wukari. out of these, 11 samples (22%) were found to be colonized by group b streptococcus, while 14 samples (28%) showed a positive response to lactobacillus species, indicating the presence of beneficial bacteria capable of providing a protective effect. the study further examined the inhibitory effects of crude and partially purified bacteriocin-like inhibitory substances produced by lactobacillus isolates on group b streptococcus. the results demonstrated that these inhibitory activities were most effective at 30 °c and an acidic ph of 5.5, suggesting optimal conditions for bacteriocin production or activity.