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12. Contagious Mastitis

The following assessment was made of their milking procedure.


Dr. Keller asks Oliver to use 1% iodophor teat dip rather than a teat spray that often does not cover the backside of the teat.

Once again, Oliver asks the inevitable question, “Now that we know what bacteria are causing the problem, which cows do we treat with antibiotics?”  Oliver adds, “Since the cows that are infected with Streptococcus agalactiae are more likely to respond to antibiotic treatment, can we start injecting those first?”

“ Yes, we should treat the cows infected with Streptococcus agalactaie, but we should not use an injectable antibiotic.  The abscess and scarring in the mammary gland reduces the ability of injected drugs from reaching the site of infection.  Whenever possible we should use antibiotics according to their approved label directions, and there are no antimicrobial agents approved for subcutaneous, intramuscular or intravenous administration for the treatment of mastitis in dairy cattle.  We will use an intramammary antibiotic.  With Streptococcus agalactiae infections, we can expect a high cure rate (~90%) using an intramammary antibiotic.   There is no need to give injectable antibiotics that may be less effective.”



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