The inhibitory role of effective microorganisms on the growth of pathogenic bacteria

Abstract

This study was conducted to evaluate the efficacy of Effective Microorganisms (EM1®) for inhibiting the growth of some pathogenic bacteria Staphylococcus aureus and E. coli were used in this study and isolated from pathological conditions. These bacteria were diagnosed in laboratory of microbiology, College of Veterinary Medicine, University of Mosul. The colonies that taken from blood agar were 5-7 and cultured in the nutrient broth and incubated at 37 ºC for 24 hours. Bacterial growth was calibrated with the second tube of the McFarland tubes 0.5%. Several concentrations of EM product were prepared 1, 0.5, 0.25 and 0.125%. Decimal dilutions were done for each concentration of EM product with bacterial suspension, except control group was done for bacterial suspension with nutrient broth. The bacterial count was done on nutrient agar, milk agar and EMB agar. The results of this study showed that the product of EM1® within concentrations 0.5-1% was highly efficient in inhibiting the growth of pathogenic bacteria under study. The bacterial count of both S. aureus and E. coli was 54x107 and 52x107 CFU/ ml respectively at 1% EM1®, and 67x107 and 86x107 CFU/ ml respectively at 0.5%, while the counting of the control group was 42x109 and 67x109 CFU/ ml respectively. This study concluded that EM1® at low concentrations have a clear role in inhibiting the growth of pathogenic bacteria, particularly S. aureus and E. coli.

Keywords

• bacterial count
• s. aureus
• e. coli