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This study identified marine microorganisms from Mexican coasts that had antimicrobial activity against Staphylococcus aureus and Vibrio parahaemolyticus, which are known worldwide to be food-poisoning agents. Representative specimens of algae, saline sediment, crustaceans and mollusks were collected. Of the 42 tested strains, 15 inhibited these pathogens. Bacillus and Virgibacillus strains were identified by 16S rRNA gene sequencing. The strains with the highest inhibitory activity against S. aureus were PCRS1-07 (B. aerius), BLCG-05 and GUO-01 (B. pumilus). The strains GUHC-04, BLCG-05, GUHC-03 (B. altitudinis) and BLBSe-05 (B. oryzicola) showed higher antimicrobial activity against V. parahaemolyticus. Biofilm production by all strains was moderate, but B. altitudinis produced a stronger biofilm. This is the first study to isolate B. aerius, B. oryzicola, B. safensis, B. boroniphilus, B. altitudinis and V. senegalensis from marine ecosystems in Mexico as well as the first study to report their inhibitory effects against both S. aureus and V. parahaemolyticus. Bioactivity of spent media from the antagonistic strains cultured as biofilm also demonstrated high antimicrobial activity. The active compounds of the antagonists are currently being studied and tested. Marine ecosystems have the highest bacterial diversity associated with invertebrates and seaweed; however, this bacterial diversity has not been well-studied on Mexican coasts.

Bacillus and Virgibacillus strains isolated from three Mexican coasts antagonize Staphylococcus aureus and Vibrio parahaemolyticus