This is a case of a patient with subacute Streptococcus pseudoporcinus endocarditis, who presented with subjective fever, weight loss, and mental status changes. Multiple blood cultures were positive for Streptococcus pseudoporcinus and echocardiogram revealed mitral valve vegetation. Antibiotics cleared his blood, but the patient underwent a mitral valve replacement. This article illustrates a potentially emerging infection by a relatively new pathogen.