Isolation and genotypic comparison of oral streptococci from experimental bitemarks

Authors

  • L. M. Borgula Moonee Ponds' Dental Group, Mooncc Ponds, Victoria, Australia.
  • F. G. Robinson Department of Oral Health Practice, University of Kentucky, Lexington, KY., USA.
  • M. Rahimi, Department of Oral Sciences and Orthodontics, University of Otago, Dunedin, New Zealand.
  • K. E. K. Chew Team Dental, Christchurch , New Zealand.
  • K. R. Birchmeier Department of Oral Biology, Medical College of Georgia, Augusta, GA., USA
  • S. G. Owens Department of Health and Human Pelformance, Western Carolina University, Cullowhee, Ne., USA
  • J. A. Kieser Department of Oral Sciences and Orthodontics, University of Otago, Dunedin, New Zealand.
  • G. R. Tompkins Department of Oral Sciences and Orthodontics, University of Otago, Dunedin, New Zealand.

Abstract

The feasibility of recovering and genotypically comparing oral bacteria from bitemarks for forensic purposes was assessed experimentally. Volunteers firmly bit their own upper arms and bitemarks were sampled at intervals to recover viable Streptococcus isolates. The recoverability of bacteria decreased over time but an average of more than one thousand viable organisms was recovered 24 hrs after biting, provided the site remained relatively undisturbed. Physical exertion, manual rubbing and application of moisturizing lotion all decreased bacterial recoverability compared to controls. Streptococci could also be recovered from bites inflicted on various fabrics. Genomic profiles (DNA "fingerprints") of bacteria recovered from bitemarks could be identified exclusively with those from the teeth of the individual responsible. These findings suggest that a bacterial genotyping approach to bitemark analysis could have forensic application in situations where the perpetrator's DNA cannot be recovered from an oral contact site.

Author Biography

G. R. Tompkins, Department of Oral Sciences and Orthodontics, University of Otago, Dunedin, New Zealand.

Address for correspondence:

Geoffrey Tompkins,

Department of Oral Sciences alld Orthodontics,

School of Dentistry, University of Otago,

PO Box 647,

Dunedin,

New Zealand.

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Published

2023-07-19

How to Cite

Borgula, L. M., Robinson, F. G., Rahimi, M., Chew, K. E. K., Birchmeier, K. R., Owens, S. G., … Tompkins, G. R. (2023). Isolation and genotypic comparison of oral streptococci from experimental bitemarks. The Journal of Forensic Odonto-Stomatology - JFOS, 21(2), 23: 30. Retrieved from https://ojs.iofos.eu/index.php/Journal/article/view/1707

Issue

Vol. 21 No. 2 (2003): JFOS issue 2 2003

Section

Bite Marks