All six mastitis-associated Mammaliicoccus sciuri genomes in a recent dairy survey carried mecA, yet only half of the isolates looked resistant on a standard cefoxitin disk test. The resistome spanned nine antibiotic classes, and two of the six isolates met the definition of multidrug resistance. Virulence and biofilm genes were widespread, but none of it proves this organism was the main cause of the mastitis it was found in. Why Mammaliicoccus sciuri matters in dairy herds Most of the damage mastitis does to a dairy business never shows up on the udder. Surveillance reports put annual incidence at roughly 20 to 40 percent of dairy animals worldwide, and subclinical cases…