Streptococcus Agalactiae, a group b streptococcus, causes mastitis in cows but doesn’t affect people, right?

The answer may not be clear-cut, according to information submitted to NMC, formerly the National Mastitis Council.

Researchers from the United Kingdom — and reported in the Journal of Clinical Microbiology — have found the type of Group B streptococcus that causes infection in three out of 1,000 newborn babies is very likely a strain that is derived from mastitis in dairy cows. They think the leap occurred about 30 years ago and researchers have no idea why it happened. However, this finding re-emphasizes the need to control Strep ag as part of your milk-quality program.