Infective endocarditis: an analysis based on strict case definitions. Ann Intern Med. 1981;94(pt 1):505 518. 226. Washington JA. The microbiological diagnosis of infective endocarditis. J Antimicrob Chemother. 1987;20(suppl A):29 39. 227. Werner AS, Cobbs CG, Kaye D, Hook EW. Studies on the bacteremia of bacterial endocarditis. JAMA. 1967;202:199 203. 228. Werner M, Andersson R, Olaison L, Hogevik H. A clinical study of cul- ture-negative endocarditis. Medicine (Baltimore). 2003;82:263 273. doi: 10.1097/01.md.0000085056.63483.d2. 229. Hoen B, Selton-Suty C, Lacassin F, Etienne J, Brian on S, Leport C, Canton P. Infective endocarditis in patients with negative blood cultures: analysis of 88 cases from a one-year nationwide survey in France. Clin Infect Dis. 1995;20:501 506. 230. Berbari EF, Cockerill FR 3rd, Steckelberg JM. Infective endocarditis due to unusual or fastidious microorganisms. Mayo Clin Proc. 1997;72:532 542. doi: 10.1016/S0025-6196(11)63302-8. 231. Pazin GJ, Saul S, Thompson ME. Blood culture positivity: suppression by outpatient antibiotic therapy in patients with bacterial endocarditis. Arch Intern Med. 1982;142:263 268. 232. Tunkel AR, Kaye D. Endocarditis with negative blood cultures. N Engl J Med. 1992;326:1215 1217. doi: 10.1056/NEJM199204303261809. 233. Baron EJ, Miller JM, Weinstein MP, Richter SS, Gilligan PH, Thomson RB Jr, Bourbeau P, Carroll KC, Kehl SC, Dunne WM, Robinson-Dunn B, Schwartzman JD, Chapin KC, Snyder JW, Forbes BA, Patel R, Rosenblatt JE, Pritt BS. A guide to utilization of the microbiology labo- ratory for diagnosis of infectious diseases: 2013 recommendations by the Infectious Diseases Society of America (IDSA) and the American Society for Microbiology (ASM)(a). Clin Infect Dis. 2013;57:e22 e121. doi: 10.1093/cid/cit278. 234. Rolain JM, Brouqui P, Koehler JE, Maguina C, Dolan MJ, Raoult D. Recommendations for treatment of human infections caused by Bartonella species. Antimicrob Agents Chemother. 2004;48:1921 1933. doi: 10.1128/AAC.48.6.1921-1933.2004. 235. 