New Tricks from an Old Cow: Infective Endocarditis Caused by Streptococcus dysgalactiae subsp dysgalactiae

We present a case of infective endocarditis caused by Streptococcus dysgalactiae subsp. dysgalactiae, a major cause of bovine mastitis and previously thought to be an animal-restricted pathogen. The patient reported no direct contact with animals, and the clinical course was severe and complicated.