Effects of different concentrations of thymol or carvacrol on the growth curve and biofilm formation of Avian pathogenic E. coli O78 and Salmonella pullorum. The effects of thymol (A) and carvacrol (B) on growth curve of Avian pathogenic E. coli O78, thymol (C), and carvacrol (D) on growth curve of Salmonella pullorum, thymol (E), and carvacrol (G) on the formation of Avian pathogenic E. coli O78 biofilm, thymol (F) and carvacrol (H) on the formation of Salmonella pullorum. Abbreviation: MIC, minimum inhibitory concentration. a-e Mean value within a role with no common superscript differ significantly (P < 0.05).