Microbial Forensics
Definition
The application of molecular biology, genomics, and population genetics to attribution questions in cases involving microorganisms, toxins, or biological agents used in crime or terrorism. Distinguished from clinical microbiology by the requirement for chain-of-custody evidence handling and court-grade reporting.
- Core disciplines
- Molecular biology, genomics, population genetics
- Application
- Attribution in bio-crime or bioterrorism cases
- Notable case
- 2001 US anthrax letters investigation
- Distinguishing requirement
- Chain of custody and court-grade reporting
Common questions
How is this different from clinical or public-health microbiology?+
Clinical microbiology asks what organism is making a patient sick and how to treat it; microbial forensics asks where a specific sample came from and who had access to produce or release it, which demands evidentiary handling standards clinical labs do not normally follow.
What makes microbial attribution scientifically difficult?+
Microorganisms can be genetically near-identical yet come from different sources, and natural strain variation can resemble deliberate engineering, so attribution relies on combining genomic comparison with production-signature and epidemiological evidence rather than genetics alone.
Related terms
- Morphotype
- A phytolith shape class defined by the geometry of the silica body: bilobate, cross-shaped, saddle-shaped, elongate, dendritic, and so on. Individual morphotypes...
- Multi-Locus Sequence Typing (MLST)
- Species-level and strain-level characterisation using DNA sequences from five to seven conserved housekeeping genes. Provides higher resolution than 16S rRNA alone and...
- NBFAC
- National Bioforensic Analysis Center, Fort Detrick, Maryland. Established 2004 as the US federal government's primary bioforensics reference laboratory for biological evidence in...
- Phylogenetic Proximity
- The principle in viral forensics that transmission between individuals is supported when their viral sequences cluster together in a phylogenetic tree separately...
- RMR-1029
- The reference material repository flask at USAMRIID Fort Detrick that was identified as the probable source material for the 2001 anthrax letters,...
- Select Agent
- A biological agent or toxin designated by the US Centers for Disease Control and Prevention and USDA as posing a severe public...