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 12—December 2015
Dispatch

Japanese Macaques (Macaca fuscata) as Natural Reservoir of Bartonella quintana

Shingo Sato, Hidenori Kabeya, Aika Yoshino, Wataru Sekine, Kazuo Suzuki, Hidetoshi B. Tamate, Shouki Yamazaki, Bruno B. Chomel, and Soichi MaruyamaComments to Author 
Author affiliations: Nihon University, Fujisawa, Japan (S. Sato, H. Kabeya, A. Yoshino, W. Sekine, S. Maruyama); Hikiiwa Park Center, Tanabe, Japan (K. Suzuki); Yamagata University, Yamagata, Japan (H.B. Tamate); Japan Wildlife Research Center, Tokyo, Japan (S. Yamazki); School of Veterinary Medicine, University of California, Davis, California, USA (B.B. Chomel)

Cite This Article

Abstract

Bartonella quintana bacteremia was detected in 6 (13.3%) of 45 wild-caught Japanese macaques (Macaca fuscata). Multilocus sequence typing of the isolates revealed that Japanese macaques were infected with a new and specific B. quintana sequence type. Free-ranging Japanese macaques thus represent another natural reservoir of B. quintana.

Bartonella quintana is the causative agent of trench fever, which is characterized in humans by headache, recurrent fever, and pretibial pain. Major epidemics of the disease occurred among soldiers in Europe during World Wars I and II. More recently, trench fever has occurred sporadically in urban areas, mainly among homeless persons, drug-addicted persons, and HIV-positive patients in Europe and the United States (1). Body lice have been recognized as the only competent vector for B. quintana in humans, and poor hygienic conditions are strongly related to the occurrence of trench fever. Thus, B. quintana is considered a notable agent of a reemerging infectious disease.

Humans were thought to be the unique natural reservoir for B. quintana (2). However, this bacterium has also been isolated from cynomolgus macaques (Macaca fascicularis) bred in captivity in the United States (3,4) and from captive cynomolgus and rhesus macaques (M. mulatta) in China (5,6). These findings suggest that macaques may be another natural reservoir for B. quintana.

The number of wild Japanese macaques (M. fuscata) has recently increased throughout Japan, and these primates have become a serious nuisance by damaging crops, invading human residential areas, and biting persons (7). Because of this increasing human contact, if these primates become infected with B. quintana, they could transmit this bacterium to humans. However, no epidemiologic studies have been conducted to evaluate B. quintana in Japanese macaques and their role as a potential source of human B. quintana infection. Our goal was to investigate the prevalence of B. quintana in wild, free-ranging Japanese macaques and clarify the genetic characteristics of the strains by multilocus sequence typing (MLST).

The Study

During July 2011–April 2014, a total of 45 blood samples were collected in EDTA-containing collection tubes from wild Japanese macaques in Aomori (n = 25), Yamagata (n = 5), and Wakayama (n = 15) Prefectures in Japan. The animals were captured by licensed trappers, in accordance with the Wildlife Protection and Proper Hunting Act, by using large hand-made cage traps and commercial cage traps (no. AM-181; Fujita Shoji Corp., Hiroshima, Japan). The physical conditions of each animal were recorded before they were euthanized, according to the guidelines of the Japanese Veterinary Medical Association. Freeze-thawed blood samples were spread onto chocolate agar plates (8) for isolation of Bartonella spp. and incubated at 35°C under 5% CO2 for up to 4 weeks. Then, CFUs per milliliter of blood were calculated. Five colonies from each culture-positive macaque sample were submitted for further characterization.

Bartonella-specific PCRs that targeted the gltA (9) and rpoB (10) genes and the 16S–23S rDNA intergenic transcribed spacer (ITS) regions (11) were used for identification of Bartonella isolates; genomic DNA of B. alsatica strain IBS 382T and nuclease-free distilled water were used as positive and negative controls for the PCRs, respectively.

Bartonella isolates were obtained from 6 (13.3%) of 45 Japanese macaques; 1 (4.0%) of 25 macaques in Aomori, 1 (20.0%) of 5 in Yamagata, and 4 (26.7%) of 15 in Wakayama prefectures. No clinical signs were observed in the macaques with culture-positive samples. The bacteremia levels in the macaques ranged from 5.0 × 101 to 3.7 × 104 CFU/mL.

The DNA sequences of all 30 isolates were identical in the gltA (338 bp), rpoB (825 bp), and ITS (1,297 bp) regions; the sequences were registered in GenBank/European Nucleotide Archive in EMBL, and DDBJ under accession nos. LC031777 (gltA), LC031778 (rpoB), and LC031779 (ITS). BLAST searches (http://blast.ncbi.nlm.nih.gov/Blast.cgi) indicated that the DNA sequences of the isolates had the highest degree of similarity (100% for gltA and rpoB, 99.5% for ITS) with those of B. quintana RM11 strain from rhesus macaques. Subsequently, MLST analysis with 9 loci (12) revealed that 6 representative strains (MF1–1, MF3–1, MF10–1, MF11–1, MF19–1, and MF34–1 strains) from each culture-positive macaque were identical and belonged to a new sequence type (ST), ST22. The allelic profiles of ST22 and other STs are shown in the Technical Appendix Table.

Figure 1

Thumbnail of Phylogenetic relationship among 1 to 22 sequence types (STs) of Bartonella quintana strains based on eBURST analysis (http://eburst.mlst.net/default.asp). Black dots indicate ST numbers of B. quintana strains. A clonal complex was defined as a group of STs that had 8 identical alleles. Clonal complexes 1, 2, 3, and 4 consist of STs 1–4, STs 6–7, STs 8–10 and 14, and STs 15–21, respectively. A lineage was defined as a group of STs that had ≥7 identical alleles. Color circles show 4 l

Figure 1. Phylogenetic relationship among 1 to 22 sequence types (STs) of Bartonella quintana strains based on eBURST analysis (http://eburst.mlst.net/default.asp). Black dots indicate ST numbers of B. quintana strains. A clonal complex...

A phylogenetic relationship between ST22 and other known STs was analyzed by using eBURST version 3 (http://eburst.mlst.net/default.asp) in combination with the MLST data. A clonal complex was defined as the group of STs that had identical alleles at 8 of 9 loci, and the lineage was defined as the group of STs that had identical alleles at 7 of the 9 loci. As previously reported (6,12), STs 1–4, STs 6 and 7, STs 8–10 and 14, and STs 15–21 formed clonal complexes 1, 2, 3, and 4, respectively, whereas ST22 remained a singleton (Figure 1). In terms of lineage classification, all STs, except ST22, were divided into 3 individual lineages by the host animal species: STs 1–7 for human strains, STs 8–14 for cynomolgus macaque strains, and STs 15–21 for rhesus macaque strains. In contrast, ST22 from Japanese macaque strains belonged to a singleton lineage.

Figure 2

Thumbnail of Phylogenetic tree showing the genetic relationship among Bartonella quintana strains from humans and macaques. The tree was constructed from the concatenated sequences (4,270 bp) of the 9 loci used for multilocus sequence typing by using the maximum-likelihood method based on the Tamura 3-parameter model in MEGA6 (13). The 22 sequence types (STs) of B. quintana strains from humans (STs 1–7), cynomolgus macaques (STs 8–4), rhesus macaques (STs 15–21), and Japanese macaques (ST22) wer

Figure 2. Phylogenetic tree showing the genetic relationship among Bartonella quintana strains from humans and macaques. The tree was constructed from the concatenated sequences (4,270 bp) of the 9 loci used for multilocus...

We constructed a phylogenetic tree with the concatenated sequences (4,270 bp) of the 9 loci in each ST using the maximum-likelihood method in MEGA6 (13). The STs 1–7 from human strains, STs 8–14 from cynomolgus macaque strains, and STs 15–21 from rhesus macaque strains were classified into groups 1, 2, and 3, respectively, as with the lineage classification by eBURST analysis. All strains of ST22 formed a monophyletic clade defined as group 4 (Figure 2).

Conclusions

Our study shows that natural infection with B. quintana can occur in free-ranging nonhuman primates in Japan. The Japanese macaques harboring B. quintana showed no clinical abnormalities, although bacteremia levels were considerably high (>103 CFU/mL) in 3 animals that tested positive. These data suggest that Japanese macaques are one of the natural reservoirs of B. quintana.

All isolates from Japanese macaques were more closely related to rhesus macaque strains than to human strains in the gltA, rpoB, and ITS regions. By MLST analysis with 9 loci, all 6 representative strains from Japanese macaques were identified as ST22 (6). Thus, ST22 is likely a new genotype of B. quintana specific to Japanese macaques. Because wild-caught Japanese macaques from only 3 prefectures were examined for B. quintana bacteremia, a large-scale surveillance study would help elucidate the genetic diversity of Japanese macaque strains.

According to eBURST analysis, human, cynomolgus macaque, and rhesus macaque lineages were formed by 4 clonal complexes. As reported previously (6,12), the primary founders in clonal complexes 1, 3, and 4 were reconfirmed as STs 2, 9, and 15, respectively. However, ST22 from wild-caught Japanese macaque strains was not found in any other clonal complex and formed an independent lineage. Through phylogenetic analysis with concatenated MLST sequences, Li et al. (6) showed that 3 groups were formed by each host species; this finding was confirmed in our study. However, ST22 from Japanese macaques formed another independent group (group 4). Bartonella spp. are known to have an adaptive strategy of causing asymptomatic and prolonged bacteremia in their specific reservoirs (14). Our data support the idea that B. quintana may have separately co-evolved with the macaque species and humans.

Notably, Bartonella DNA was recently detected in gorillas from West Africa, suggesting that nonhuman primates, including apes, could be naturally infected with Bartonella spp. (15). Further studies are necessary to clarify the prevalence of B. quintana and the vector of the organism in other nonhuman primates, and the potential of these primates to serve as a source of infection to humans.

Dr. Sato is an assistant professor in the Department of Veterinary Medicine, College of Bioresource Sciences, Nihon University, Fujisawa, Japan. His primary research interests are the epidemiology of Bartonellosis, bacterial ecology in wildlife, and control of bacterial zoonoses.

Top

Acknowledgments

We thank Hideo Higashi and Shiro Matsuoka for their help with sample collection.

This work was supported in part by the Japan Society for the Promotion of Science Grant-in-Aid for Young Scientists (B) grant no. 26850188, and the Strategic Research Base Development Program, International Research on Epidemiology of Zoonoses and Training for Young Researchers grant no. S1491007 by the Ministry of Education, Culture, Sports, Science and Technology, Japan.

Top

References

  1. Foucault  C, Brouqui  P, Raoult  D. Bartonella quintana characteristics and clinical management. Emerg Infect Dis. 2006;12:21723 . DOIPubMed
  2. Deng  H, Le Rhun  D, Buffet  JP, Cotte  V, Read  A, Birtles  RJ, Strategies of exploitation of mammalian reservoirs by Bartonella species. Vet Res. 2012;43:15. DOIPubMed
  3. O’Rourke  LG, Pitulle  C, Hegarty  BC, Kraycirik  S, Killary  KA, Grosenstein  P, Bartonella quintana in cynomolgus monkey (Macaca fascicularis). Emerg Infect Dis. 2005;11:19314. DOIPubMed
  4. Maggi  RG, Mascarelli  PE, Balakrishnan  N, Rohde  CM, Kelly  CM, Ramaiah  L, “Candidatus Mycoplasma haemomacaque” and Bartonella quintana bacteremia in cynomolgus monkeys. J Clin Microbiol. 2013;51:140811. DOIPubMed
  5. Huang  R, Liu  Q, Li  G, Li  D, Song  X, Birtles  RJ, Bartonella quintana infections in captive monkeys, China. Emerg Infect Dis. 2011;17:17079. DOIPubMed
  6. Li  H, Bai  JY, Wang  LY, Zeng  L, Shi  YS, Qiu  ZL, Genetic diversity of Bartonella quintana in macaques suggests zoonotic origin of trench fever. Mol Ecol. 2013;22:211827. DOIPubMed
  7. Fooden  J, Aimi  M. Systematic review of Japanese macaques, Macaca fuscata (Gray, 1870). Fieldiana Zoology. 2005;104:1198.
  8. Zhang  P, Chomel  BB, Schau  MK, Goo  JS, Droz  S, Kelminson  KL, A family of variably expressed outer-membrane proteins (Vomp) mediates adhesion and autoaggregation in Bartonella quintana. Proc Natl Acad Sci U S A. 2004;101:136305 . DOIPubMed
  9. Norman  AF, Regnery  R, Jameson  P, Greene  C, Krause  DC. Differentiation of Bartonella-like isolates at the species level by PCR-restriction fragment length polymorphism in the citrate synthase gene. J Clin Microbiol. 1995;33:1797803 .PubMed
  10. Kabeya  H, Inoue  K, Izumi  Y, Morita  T, Imai  S, Maruyama  S. Bartonella species in wild rodents and fleas from them in Japan. J Vet Med Sci. 2011;73:15617. DOIPubMed
  11. Roux  V, Raoult  D. The 16S–23S rRNA intergenic spacer region of Bartonella (Rochalimaea) species is longer than usually described in other bacteria. Gene. 1995;156:10711. DOIPubMed
  12. Arvand  M, Raoult  D, Feil  EJ. Multi-locus sequence typing of a geographically and temporally diverse sample of the highly clonal human pathogen Bartonella quintana. PLoS ONE. 2010;5:e9765. DOIPubMed
  13. Tamura  K, Stecher  G, Peterson  D, Filipski  A, Kumar  S. MEGA6: Molecular Evolutionary Genetics Analysis version 6.0. Mol Biol Evol. 2013;30:27259. DOIPubMed
  14. Chomel  BB, Boulouis  HJ, Breitschwerdt  EB, Kasten  RW, Vayssier-Taussat  M, Birtles  RJ, Ecological fitness and strategies of adaptation of Bartonella species to their hosts and vectors. Vet Res. 2009;40:29. DOIPubMed
  15. Bittar  F, Keita  MB, Lagier  JC, Peeters  M, Delaporte  E, Raoult  D. Gorilla gorilla gorilla gut: a potential reservoir of pathogenic bacteria as revealed using culturomics and molecular tools. Sci Rep. 2014;4:7174.

Top

Figures

Top

Cite This Article

DOI: 10.3201/eid2112.150632

Table of Contents – Volume 21, Number 12—December 2015

Comments

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

Soichi Maruyama, Laboratory of Veterinary Public Health, Department of Veterinary Medicine, College of Bioresource Sciences, Nihon University, 1866 Kameino, Fujisawa, Kanagawa 252-0880 Japan

Send To

character(s) remaining.

Comment submitted successfully, thank you for your feedback.

Top

Page created: November 17, 2015
Page updated: November 17, 2015
Page reviewed: November 17, 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