Bartonella Henselae is an uncommon, but significant cause of “culture-negative” endocarditis. While six Bartonella species have reportedly caused infective endocarditis (IE) in humans, the vast majority of cases are secondary to either B. quintana or B. henselae. The epidemiologic features of patients predisposed to Bartonella endocarditis are varied. Alcoholism, body lice infestation, and homelessness have been associated with B. quintana endocarditis, while B. henselae endocarditis has been linked to prior valvular disease and cat exposure.1-4 Patients with Bartonella endocarditis have clinical manifestations similar to those seen with traditional forms of subacute bacterial endocarditis. However, the rarity of the disease compounded by limitations of diagnostic testing make this entity a diagnostic challenge. This case exemplifies a classic presentation of Bartonella endocarditis while highlighting the systemic repercussions of inadequate source control and challenges associated with surgical intervention.