Researchers collected bacteria and fungi from the mouths of pet dogs and cats, as well as environmental soil bacteria, to search for natural antimicrobial compounds. They found that some of these microorganisms produce substances that can kill harmful bacteria like E. coli and fungi like Candida albicans, especially when combined with existing antifungal medications. Notably, one environmental bacterium (Streptomyces) produced a compound that was even effective against fungal strains resistant to common antifungal drugs, suggesting promising new treatment possibilities.