THE BACTERIOLOGICAL SAFETY AND ANTIMICROBIAL SUSCEPTIBILITY OF BACTERIA ISOLATED FROM STREET- VENDED WHITE LUPIN (LUPINUS ALBUS) IN BAHIR DAR, ETHIOPIA

Abstract

BACKGROUND: Whereas street vended foods are readily available sources of meals for many peopleacross the world, the microbial safety of such food is always uncertain. In developing countries the majorsources of food-borne illnesses are street vended foods. The aim of this study was thus to assess theprevalence and antibiogram of bacteria from white lupin in Bahir Dar Town.METHODS : A total of 40 samples were processed for detection of indicator bacteria and pathogensfrom December, 2011 to February, 2012 using standard bacteriological techniques. Antimicrobialsusceptibility test was performed using the Kirby-Bauer disk diffusion method.RESULTS : The total coliform counts were 954.2±385 and 756.2±447.3 at the surface and the core ofwhite lupin, respectively. On the other hand, the fecal coliform counts were 880.9±396.6 and 662.1±461.9at surface and the core, respectively. There was a statistically significant difference in total colifoms andfecal coliform counts between the surface and core of white lupin (p <0.05). Escherichia coli 29 (72.5%),Salmonella spp. 23 (57.5%) and Shigella spp. 8 (20%) were the pathogens isolated. Most bacterialisolates were resistant to tetracycline, cotriamoxazole and erythromycin whereas many of them weresensitive to chloramphenicol, nalidixic acid, gentamicin and ciprofloxacin. The overall multipleantimicrobial resistances rate was 75%.CONCLUSION : This study revealed contamination of white lupin and a potential health to consumers,and the bacteria isolated showed high rates of multiple drug resistance. Surveillance of antimicrobialresistance should be done on food borne pathogens. In addition, further studies should be conducted onthe bacteriological quality of waters used for soaking white lupin.