Genital Microbiome Study Offers New Forensic Tool for Sexual Assault Cases

Australian researchers find that unique bacterial signatures, or 'sexome,' transfer during intercourse and could aid investigations where DNA evidence is lacking.

Scientists from Murdoch University and other institutions have identified the 'sexome,' a unique bacterial signature in the genital microbiome that transfers between partners during intercourse.
The study suggests that these microbial traces could help identify perpetrators in sexual assault cases, even when condoms are used or DNA evidence is absent.
Researchers analyzed genital swabs from 12 heterosexual couples before and after intercourse, finding that bacterial transfer occurred regardless of factors like condom use, circumcision, or pubic hair presence.
The study highlights the potential of microbiome analysis to extend the window for detecting evidence beyond traditional DNA methods, which are most effective within 24 hours post-assault.
Further research is needed to refine the technique, understand the persistence of transferred bacteria, and explore its application in diverse populations and scenarios.