Skip directly to site content Skip directly to page options Skip directly to A-Z link Skip directly to A-Z link Skip directly to A-Z link
Volume 21, Number 8—August 2015
Dispatch

Bartonella spp. and Coxiella burnetii Associated with Community-Acquired, Culture-Negative Endocarditis, Brazil

Figures
Tables
Article Metrics
19
citations of this article
EID Journal Metrics on Scopus
Author affiliations: University of São Paulo Medical School, São Paulo, Brazil (R.F. Siciliano, J.B. Castelli, A.J. Mansur, M. Grinberg, T.M.V. Strabelli); Adolfo Lutz Institute, São Paulo (F. Pereira dos Santos, S. Colombo, E.M. Nascimento, R.A. Brasil); Centers for Disease Control and Prevention, Atlanta, Georgia, USA (C.D. Paddock); State University of Campinas Medical School, Campinas, Brazil (P.E.N.F. Velho, M.R. Drummond)

Cite This Article

Abstract

We evaluated culture-negative, community-acquired endocarditis by using indirect immunofluorescent assays and molecular analyses for Bartonella spp. and Coxiella burnetii and found a prevalence of 19.6% and 7.8%, respectively. Our findings reinforce the need to study these organisms in patients with culture-negative, community-acquired endocarditis, especially B. henselae in cat owners.

Worldwide, Bartonella spp. and Coxiella burnetii endocarditis have varied prevalences and clinical effects (1,2). Detection is difficult in routine blood cultures, so different diagnosis methods are needed. Our study investigated the frequency of and the risk factors for Bartonella spp. and C. burnetii infection in cases of culture-negative, community-acquired endocarditis.

The Study

During January 2004–January 2009, the Infection Control Team from the university hospital at São Paulo, Brazil (Instituto do Coração–Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo) used active surveillance to identify 369 patients with endocarditis. The study focused on community-acquired endocarditis caused by fastidious bacteria. Patients >18 years of age with confirmed endocarditis were included as a prospective inception cohort of patients (3). Excluded were patients with health care–associated endocarditis (i.e., patients with prosthetic valve endocarditis in the first postoperative year, hemodialysis patients, and nosocomial endocarditis patients) (4).

Indirect immunofluorescence assays (IFAs) were performed for all patients with negative blood cultures <7 days after admission at a referral center for rickettsial infections (Adolfo Lutz Institute, São Paulo). The same observer analyzed all assays; IgG titers ≥1:800 for B. henselae and B. quintana (5) and anti–phase I IgG titers ≥1:800 for C. burnetii (6) were considered positive (Technical Appendix). New diagnostic criteria for Q fever endocarditis were used (6).

Immunohistochemical and molecular methods were applied to valve tissue specimens and serum samples of patients whose serum samples were positive for Bartonella spp. or C. burnetii. DNA from paraffin-embedded valve tissue specimens and serum samples were extracted. Samples positive for Bartonella by IFA were analyzed by using 5 different PCRs to 4 distinct regions. Tissue and serum DNA from patients positive for C. burnettii by IFA were tested by quantitative PCR (Technical Appendix Table 1) (7).

Of the 369 identified endocarditis patients, 221 (59.9%) were included in the study; median age of included patients was 53 years. Of included patients, 144 (65.2%) were male; 107 (48.4%) had prosthetic valves; 209 (94.6%) had left-sided endocarditis; and 152 (68.8%) had concurrent conditions. Of patients with concurrent conditions, 62 (40.8%) had hypertension, 17 (11.2%) had diabetes, 53 (34.9%) had heart failure, and 36 (23.7%) had other conditions. Of the 221 patients included in the study, microorganisms were identified in 170 (76.9%); specimens from 51 (23.1%) patients were culture negative.

A standardized questionnaire regarding exposure to cats, ectoparasites, or farm animals was administered to patients with culture-negative endocarditis. For the 170 samples in which microorganisms were found, the most commonly identified bacteria were viridans-type Streptococci (81 [47.6%]), Streptococcus bovis (17 [10.0%]), S. pneumonie (6 [3.5%]), S. agalactiae (2 [1.2%]), S. pyogenes (2 [1.2%]), Enterococcus fecalis (13 [7.6%]), E. faecium (3 [1.8%]), other enterococci (4 [2.4%]) and Staphylococcus aureus (14 [8.2%]).

Figure

Thumbnail of Distribution of patients etiologically diagnosed with endocarditis and admitted to the heart institute (Instituto do Coração) at the University of São Paulo Medical School, Sao Paulo, Brazil, January 2004–January 2009.  *A modified Duke criteria (3) was used to determine inclusion of 221 patients. Excluded were 148 patients: 58 with unconfirmed endocarditis, 28 with endocarditis caused by cardiac implantable electronic devices, 47 with nosocomial endocarditis, and 15 hemodialysis pa

Figure. Distribution of patients etiologically diagnosed with endocarditis and admitted to the heart institute (Instituto do Coração) at the University of São Paulo Medical School, Sao Paulo, Brazil, January 2004–January 2009....

For the 221 patients in the study, findings from 10 (4.5%; 95% CI 3.96%–5.09%) patients (Figure) showed Bartonella spp., and 4 (1.8%; 95% CI 1.58%–2.04%) showed C. burnetii endocarditis. For the 51 culture-negative endocarditis patients, Bartonella spp. was found in cultures from 10 (19.6%; 95% CI 9.8%–33.1%), and C. burnetii was found in 4 (7.8%; 95% CI 2.2%–18.9%). The Table shows the immunohistochemical and molecular biology analyses for patients with positive IFA results. Bartonella spp. DNA was detected with >1 PCR in all 6 patients whose paraffin-embedded valve tissue samples were found positive for Bartonella spp. For the other 4 patients with Bartonella spp., DNA was detected in 2 serum samples. Amplicons were sequenced, and their analyses showed that the cultures from 2 patients had 100% similarity with B. quintana (GenBank accession no. BX897700.1); cultures from 4 patients had 100% similarity with B. henselae infection (GenBank accession no. BX897699.1). Cultures from 2 patients were positive for Bartonella spp. by using IFA but negative by using PCR.

All patients used antimicrobial drugs for 7 days before sample collection. All endocarditis patients whose cultures were found to be positive for C. burnetii by using IFA were also positive by using quantitative PCR: 3 by serum samples and 2 by paraffin-embedded valve tissue specimens (Technical Appendix Table 2).

Clinical and follow-up findings from Bartonella spp. and C. burnetii endocarditis patients are shown in Technical Appendix Table 3. Bartonella spp. infection was associated with low levels of C-reactive protein on admission and chronic symptoms related to endocarditis (Technical Appendix Table 4). Three (75%) of 4 patients with Bartonella henselae endocarditis were associated with a cat living in the patient’s home, compared with 6 (12.8%) of 47 patients with culture-negative Bartonella henselae negative endocarditis (p = 0.015 by Student t-test). Hydroxychloroquine was unavailable in our facility; therefore, we used a second-line therapy for C. burnetii endocarditis. Hydroxychloroquine was replaced with ciprofloxacin, and treatment was extended for 72 months (8). Subsequently, symptoms resolved, and antibody titers reduced substantially, considered a favorable response (9) (Technical Appendix Table 3).

Conclusions

In this study, the systematic use of IFA detected a 4.5% (10/221) prevalence of community-acquired endocarditis due to Bartonella spp. and a 1.8% (4/221) prevalence due to C. burnetii. For the 51 culture-negative endocarditis patients, IFA enabled recognition of the endocarditis etiology in 14 (27.5%) patients (Bartonella spp. in 10 [19.6%] and C. burnetii in 4 [7.8%]). Some of these patients have been recognized as having the first cases of endocarditis caused by these microorganisms in Brazil (10,11).

Prevalences of Bartonella spp. endocarditis vary worldwide by region studied (1). In a broad series of 759 culture-negative endocarditis patients in France, serum samples showed high sensitivity for detection of C. burnetii and Bartonella spp. infections, compared with other diagnostic tools, such as PCR, cell culture, and immunohistochemical analysis (2). In Brazil, studies of Bartonella spp. infection among culture-negative endocarditis patients have shown varied results. A retrospective case series of 51 surgically treated, culture-negative endocarditis patients found 2 cases of Bartonella spp. and 1 case of C. burnetii by using PCR on valvular tissue (12). Another series of 46 culture-negative endocarditis patients from the city of São Paulo used PCR to investigate Bartonella spp. in blood and found 13 (28%) patients with positive results (13).

We found an association between B. henselae endocarditis and the presence of a cat living at a patient´s home, a risk factor indicating that clinicians should consider this infection when assessing endocarditis patients. The relatively small sample of patients with endocarditis caused by Bartonella spp. and C. burnetii limited the statistical analyses of factors associated with these infections. Serologic investigations of infections by these agents were applied only to patients with negative cultures. Although rare (2,14), co-infection by these microorganisms in culture-positive endocarditis is possible, so frequency of Bartonella spp. and C. burnetii infections in these patients may be higher than shown. Our study indicates that systematic serologic research for Bartonella spp. and C. burnetii in community-acquired, culture-negative endocarditis may be clinically useful, particularly in screening for B. henselae in cat owners.

Dr. Siciliano is an infectious disease specialist working in infection control at the Heart Institute at the university hospital at São Paulo, Brazil, a tertiary care hospital dedicated to care of heart disease patients. His clinical research interest is endocarditis.

Top

References

  1. Tattevin  P, Watt  G, Revest  M, Arvieux  C, Fournier  PE. Update on blood culture-negative endocarditis. Med Mal Infect. 2015;45:18. DOIPubMedGoogle Scholar
  2. Fournier  PE, Thuny  F, Richet  H, Lepidi  H, Casalta  JP, Arzouni  JP, Comprehensive diagnostic strategy for blood culture-negative endocarditis: a prospective study of 819 new cases. Clin Infect Dis. 2010;51:13140. DOIPubMedGoogle Scholar
  3. Li  JS, Sexton  DJ, Mick  N, Nettles  R, Fowler  VG Jr, Ryan  T, Proposed modifications to the Duke criteria for the diagnosis of infective endocarditis. Clin Infect Dis. 2000;30:6338. DOIPubMedGoogle Scholar
  4. Ben-Ami  R, Giladi  M, Carmeli  Y, Orni-Wasserlauf  R, Siegman-Igra  Y. Hospital-acquired infective endocarditis: should the definition be broadened? Clin Infect Dis. 2004;38:84350. DOIPubMedGoogle Scholar
  5. Fournier  PE, Mainardi  JL, Raoult  D. Value of microimmunofluorescence for diagnosis and follow-up of Bartonella endocarditis. Clin Diagn Lab Immunol. 2002;9:795801 .PubMedGoogle Scholar
  6. Raoult  D. Chronic Q fever: expert opinion versus literature analysis and consensus. J Infect. 2012;65:1028. DOIPubMedGoogle Scholar
  7. Schneeberger  PM, Hermans  MH, van Hannen  EJ, Schellekens  JJ, Leenders  AC, Wever  PC. Real-time PCR with serum samples is indispensable for early diagnosis of acute Q fever. Clin Vaccine Immunol. 2010;17:28690. DOIPubMedGoogle Scholar
  8. Raoult  D, Houpikian  P, Tissot Dupont  H, Riss  JM, Arditi-Djiane  J, Brouqui  P. Treatment of Q fever endocarditis: comparison of 2 regimens containing doxycycline and ofloxacin or hydroxychloroquine. Arch Intern Med. 1999;159:16773. DOIPubMedGoogle Scholar
  9. Rolain  JM, Mallet  MN, Raoult  D. Correlation between serum doxycycline concentrations and serologic evolution in patients with Coxiella burnetii endocarditis. J Infect Dis. 2003;188:13225. DOIPubMedGoogle Scholar
  10. Siciliano  RF, Strabelli  TM, Zeigler  R, Rodrigues  C, Castelli  JB, Grinberg  M, Infective endocarditis due to Bartonella spp. and Coxiella burnetii: experience at a cardiology hospital in Sao Paulo, Brazil. Ann N Y Acad Sci. 2006;1078:21522. DOIPubMedGoogle Scholar
  11. Siciliano  RF, Ribeiro  HB, Furtado  RH, Castelli  JB, Sampaio  RO, Santos  FC, Endocarditis due to Coxiella burnetii (Q fever): a rare or underdiagnosed disease? Case report [in Portuguese]. Rev Soc Bras Med Trop. 2008;41:40912. DOIPubMedGoogle Scholar
  12. Lamas  CC, Ramos  RG, Lopes  GQ, Santos  MS, Golebiovski  WF, Weksler  C, Bartonella and Coxiella infective endocarditis in Brazil: molecular evidence from excised valves from a cardiac surgery referral center in Rio de Janeiro, Brazil, 1998 to 2009. Int J Infect Dis. 2013;17:e656. DOIPubMedGoogle Scholar
  13. Corrêa  FG, Pontes  CLS, Verzola  RMM, Mateos  JCP, Velho  PENF, Schijman  AG, Association of Bartonella spp bacteremia with Chagas cardiomyopathy, endocarditis and arrythmias in patients from South America. Braz J Med Biol Res. 2012;45:64451. DOIPubMedGoogle Scholar
  14. Raoult  D, Casalta  JP, Richet  H, Khan  M, Bernit  E, Rovery  C, Contribution of systematic serological testing in diagnosis of infective endocarditis. J Clin Microbiol. 2005;43:523842. DOIPubMedGoogle Scholar

Top

Figure
Table

Top

Cite This Article

DOI: 10.3201/eid2108.140343

Table of Contents – Volume 21, Number 8—August 2015

EID Search Options
presentation_01 Advanced Article Search – Search articles by author and/or keyword.
presentation_01 Articles by Country Search – Search articles by the topic country.
presentation_01 Article Type Search – Search articles by article type and issue.

Top

Comments

Please use the form below to submit correspondence to the authors or contact them at the following address:

Rinaldo F. Siciliano, Av Dr. Eneas de Carvalho Aguiar, 44, Bloco 1, sala CCIH, Cerqueira Cesar-SP, São Paulo 05403-000, Brazil

Send To

10000 character(s) remaining.

Top

Page created: July 15, 2015
Page updated: July 15, 2015
Page reviewed: July 15, 2015
The conclusions, findings, and opinions expressed by authors contributing to this journal do not necessarily reflect the official position of the U.S. Department of Health and Human Services, the Public Health Service, the Centers for Disease Control and Prevention, or the authors' affiliated institutions. Use of trade names is for identification only and does not imply endorsement by any of the groups named above.
file_external