Naringenin's potential antibacterial and antifungal behaviour has been investigated. In 1987, it was reported that naringenin had no antibacterial activity against Staphylococcus epidermidis .  This finding was not replicated in a 2000 study in which naringenin was shown to indeed have an antimicrobial effect on S. epidermidis , as well as Staphylococcus aureus , Bacillus subtilis , Micrococcus luteus , and Escherichia coli .  Further research has added evidence for antimicrobial effects against Lactococcus lactis ,  lactobacillus acidophilus , Actinomyces naeslundii , Prevotella oralis , Prevotella melaninogencia , Porphyromonas gingivalis ,  as well as yeasts such as Candida albicans , Candida tropicalis , and Candida krusei .  There is also evidence of antibacterial effects on H. pylori , though naringenin has not been shown to have any inhibition on urease activity of the microbe.