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Antibacterial Activity Test of Combined Extracts of Guava Leaves (Psidium guajava L.) and Celery Stalks (Apium graveolens L. var. dulce) Against Staphylococcus aureus and Escherichia coli. JRKI. 2026;8(2):219-229. doi:10.33759/jrki.v8i2.995