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Volume 20, Number 2—February 2014
Letter

Injectional Anthrax in Heroin Users, Europe, 2000–2012

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To the Editor: Anthrax is a global zoonotic disease, but human infections are rare in countries of Western Europe. During 2009–2010, a total of 119 (47 laboratory-confirmed) drug-abuse–related cases of anthrax were reported in the United Kingdom and Germany (1). In these patients, the disease had an unusual manifestation. In contrast to acquiring the disease through typical routes of infection, leading to cutaneous, inhalation, or gastrointestinal anthrax, these patients became infected by injecting heroin (13). The term injectional anthrax was then coined to describe this new mode of infection. Patients with injectional anthrax show severe symptoms, and death rates are high. Of the 47 patients with confirmed cases of injectional anthrax acquired during the 2009–2010 outbreak, 19 died from the disease (1). However, this outbreak was not the first report of death caused by B. anthracis in an injectional drug (heroin) user; the disease was described in 1 person who died in Norway in 2000 (3).

Attempts to directly connect the United Kingdom cases to batches of anthrax-contaminated heroin were unsuccessful. No viable B. anthracis or DNA could be retrieved from the investigation’s drug samples. However, PCR- or culture-positive samples were obtained from some patients and used for genotyping (2). Later, researchers from Arizona and the United Kingdom worked together to use a high-resolution molecular approach to genotype the 2009–2010 outbreak strains. This information was used to obtain insight into the epidemiology and likely geographic origin of the European outbreak strains.

All patients were infected by a single B. anthracis strain type (2,4) that belonged to the large Trans-Eurasian clade of B. anthracis. The whole genome of a representative strain of this type, Ba4599, had previously been sequenced (2). Strains related to strains associated with those isolated from European drug users, which belong to the A.Br. 008/011 canSNP cluster but are still genetically distinct, have so far only been identified from Turkey (2). However, more isolates from other relevant regions need to be investigated to confirm the likely geographic source.

In June 2012, after a 20-month gap, 2 new cases of injectional anthrax in heroin consumers were reported in Bavaria (5,6). Additional cases have been reported since then from Germany, Denmark, the United Kingdom, and France, leading to 26 deaths as of August 2013 (7).

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Thumbnail of Diagram of single nucleotide polymorphism (SNP) assays used for bioforensic genotyping of heroin-associated Bacillus anthracis strains. Shown are the results of PCR-based SNP assays performed to elucidate the phylogenetic position of strains. Indicated at the top of the column is the whole strain pool of B. anthracis genotype A.Br. 008/011; the vertical black line indicates the assays in a direction of revealing increasing proximity to the heroin-associated strains. SNPs common to t

Figure. . Diagram of single nucleotide polymorphism (SNP) assays used for bioforensic genotyping of heroin-associated Bacillus anthracis strains. Shown are the results of PCR-based SNP assays performed to elucidate the phylogenetic position...

Molecular phylogenetic methods were used to determine the genetic relatedness of these strains with Ba4599 (8,9). Genotyping results using canonical single nucleotide polymorphisms (SNPs) (Figure) (2,4) placed all of these strains along branch A.Br.008 within the Trans-Eurasian group of B. anthracis (10). Further hierarchical fine-scale typing of the isolates by interrogating SNPs that were discovered from the heroin-associated strain Ba4599 (2) indicated that all isolates are identical at these SNPs (Figure) (7). The initial strain isolated in Norway in 2000 also falls into this group (7). In addition, analysis by multiple locus variable number tandem repeats suggested that all investigated strains are closely related, differing at just 2 markers (7). Thus, we conclude that all injectional anthrax isolates likely came from the same source.

This reemergence of drug-related anthrax in Europe strengthens the view that heroin may provide a continuing route of entry for B. anthracis into Western Europe (2). Ideally, this unfortunate deadly incident could offer an opportunity to sensitize heroin users to the risks for severe infection and to educate public health officials to be vigilant for this rare disease. This study also shows the power of molecular genotyping approaches for trace-back analysis of infectious disease agents.

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Acknowledgments

We thank Daniela Horenkamp and Claudia Kahlhofer for skillful technical assistance and Holger C. Scholz, Roland Grunow, and Dawn Birdsell for helpful discussions.

Collaboration between the Bundeswehr Institute of Microbiology and Northern Arizona University is part of a project funded by the US Department of Homeland Security Science and Technology Directorate through award 2010-ST-108-000015. This work was also supported in part by the US Department of Homeland Security Science and Technology Directorate award HSHQDC-10-C-00139.

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Matthias Hanczaruk, Udo Reischl, Thomas Holzmann, Dimitrios Frangoulidis, David M. Wagner, Paul S. Keim, Markus H. Antwerpen, Hermann Meyer, and Gregor GrassComments to Author 
Author affiliations: Bundeswehr Institute of Microbiology, Munich, Germany (M. Hanczaruk, D. Frangoulidis, M.H. Antwerpen, H. Meyer, G. Grass); University Hospital Regensburg, Regensburg, Germany (U. Reischl, T. Holzmann); Northern Arizona University, Flagstaff, Arizona, USA (D. Wagner, P.S. Keim)

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References

  1. Health Protection Scotland. An outbreak of anthrax among drug users in Scotland, December 2009 to December 2010. A report on behalf of the national Anthrax Outbreak Control Team. 2011 [cited 2013 Aug 20]. http://www.documents.hps.scot.nhs.uk/giz/anthrax-outbreak/anthrax-outbreak-report-2011-12.pdf
  2. Price  EP, Seymour  ML, Sarovich  DS, Latham  J, Wolken  SR, Mason  J, The molecular epidemiologic investigation of an anthrax outbreak in European heroin users. Emerg Infect Dis. 2012;18:130713. DOIPubMedGoogle Scholar
  3. Ringertz  SH, Hoiby  EA, Jensenius  M, Maehlen  J, Caugant  DA, Myklebust  A, Injectional anthrax in a heroin skin-popper. Lancet. 2000;356:15745. DOIPubMedGoogle Scholar
  4. Van Ert  MN, Easterday  WR, Huynh  LY, Okinaka  RT, Hugh-Jones  ME, Ravel  J, Global genetic population structure of Bacillus anthracis. PLoS ONE. 2007;2:e461. DOIPubMedGoogle Scholar
  5. Holzmann  T, Frangoulidis  D, Simon  M, Noll  P, Schmoldt  S, Hanczaruk  M, Fatal anthrax infection in a heroin user from southern Germany, June 2012. Euro Surveill. 2012;17:20204.PubMedGoogle Scholar
  6. Rückert  C, Licht  K, Kalinowski  J, Espirito Santo  C, Antwerpen  M, Hanczaruk  M, Draft genome sequence of Bacillus anthracis UR-1, isolated from a German heroin user. J Bacteriol. 2012;194:59978. DOIPubMedGoogle Scholar
  7. Grunow  R, Klee  SR, Beyer  W, George  M, Grunow  D, Barduhn  A, Anthrax among heroin users in Europe possibly caused by same Bacillus anthracis strain since 2000. Euro Surveill. 2013;18:20204 .PubMedGoogle Scholar
  8. Antwerpen  MH, Zimmermann  P, Bewley  K, Frangoulidis  D, Meyer  H. Real-time PCR system targeting a chromosomal marker specific for Bacillus anthracis. Mol Cell Probes. 2008;22:3135. DOIPubMedGoogle Scholar
  9. Ellerbrok  H, Nattermann  H, Ozel  M, Beutin  L, Appel  B, Pauli  G. Rapid and sensitive identification of pathogenic and apathogenic Bacillus anthracis by real-time PCR. FEMS Microbiol Lett. 2002;214:519. DOIPubMedGoogle Scholar
  10. Price  EP, Seymour  ML, Sarovich  DS, Latham  J, Wolken  SR, Mason  J, Molecular epidemiologic investigation of an anthrax outbreak among heroin users, Europe. Emerg Infect Dis. 2012;18:130713. DOIPubMedGoogle Scholar

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DOI: 10.3201/eid2002.120921

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Gregor Grass, Bundeswehr Institute of Microbiology, Neuherbergstrasse 11, 80937 Munich, GermanyGregor Grass, Bundeswehr Institute of Microbiology, Neuherbergstrasse 11, 80937 Munich, Germany

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Page created: January 16, 2014
Page updated: January 16, 2014
Page reviewed: January 16, 2014
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.
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