opportunistic pathogen from cow mastitis

Holstein cow, 1 lactation, lactation 156 days, teats red and swollen, sensitive milk area, a small amount of flocculent precipitate in milk, and somatic cell count of 1.15 x 10*7/mL. Isolation and treatment for 4 days (kanamycin udder instillation in conjunction with systemic injection of cefquinome), continued to be observed for 1 week and released back to the original pens until the milk returned to normal. After 1 month, it was determined to be subclinical mastitis by the California Mastitis Test Reagent during routine on-farm testing,