6. Department of Veterinary Public Health and Veterinary Microbiology, College of Agriculture and Veterinary Medicine, Jimma University, Jimma, Ethiopia; 7. M-team and Mastitis and Milk Quality Research Unit, Department of Reproduction, Obstetrics and Herd Health, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820, Merelbeke, Belgium.