Bacterial transfer during sexual intercourse as a tool for forensic detection

Area of Science:

• Forensic microbiology
• Human microbiome research
• Molecular biology

Background:

• Establishing evidence of criminal involvement often relies on detecting material transfer.
• Bacterial signatures from the reproductive system offer a novel forensic tool.
• Understanding microbial transfer is crucial for sexual assault investigations.

Purpose of the Study:

• To demonstrate the transfer of unique bacterial signatures from the reproductive system during sexual intercourse.
• To investigate the impact of barrier contraceptives on microbial transfer.
• To assess the utility of these microbial signatures in forensic casework, particularly in sexual assault investigations.

Main Methods:

• Full-length 16S rRNA gene sequencing to analyze bacterial communities.
• Microbial signature analysis to identify transfer patterns.
• Evaluation of contraceptive effects on microbial transfer.

Main Results:

• Demonstrated transfer of distinct bacterial signatures from the reproductive tract during intercourse.
• Observed alterations in microbial transfer patterns with the use of barrier contraceptives.
• Confirmed the potential of these signatures as forensic evidence.

Conclusions:

• Reproductive system bacterial signatures can be transferred during sexual intercourse.
• These microbial signatures represent a valuable tool for forensic investigations, especially in sexual assault cases.
• The findings support the use of microbiome analysis in identifying perpetrators when conventional DNA evidence is limited.