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Related Experiment Video

Updated: Mar 23, 2026

A Fluorescence-based Method to Study Bacterial Gene Regulation in Infected Tissues

A Fluorescence-based Method to Study Bacterial Gene Regulation in Infected Tissues

Published on: February 19, 2019

Fluorescently labeled bacteria provide insight on post-mortem microbial transmigration.

Z M Burcham¹, J A Hood¹, J L Pechal²

¹Department of Biological Sciences, Mississippi State University, Starkville, MS, USA.

Forensic Science International

|April 2, 2016

Summary

The post-mortem microbiome changes rapidly after death. Tracking bacterial transmigration, like Staphylococcus aureus, can help estimate the time since death and aid investigations.

Keywords:

Clostridium perfringens Decomposition Forensics Necrobiome Staphylococcus aureus

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Published on: September 13, 2019

Area of Science:

Forensic microbiology
Decomposition science
Microbial ecology

Background:

Post-mortem microbiology is crucial for understanding human decomposition.
The dynamics of microbial communities within cadavers are not well understood.
Changes in the microbiome after death link ante-mortem and post-mortem states.

Purpose of the Study:

To investigate the post-mortem dynamics of Staphylococcus aureus and Clostridium perfringens.
To determine how bacterial transmigration aids in post-mortem interval estimation.
To link microbial changes to decomposition events for forensic applications.

Main Methods:

Intranasal inoculation of S. aureus and C. perfringens in a mouse model (Mus musculus L.).
In vivo and in vitro imaging for S. aureus tracking.
Culture-based techniques for C. perfringens tracking.
Sample collection from 1 hour to 60 days post-mortem.

Main Results:

S. aureus peaked at 5-7 days post-mortem, becoming undetectable by day 30.
Bacterial species were tracked transmigrating into previously sterile body sites.
Colonization routes correlated with physiological decomposition events.

Conclusions:

Tracking post-mortem bacterial transmigration offers a novel method for estimating the post-mortem interval.
Microbial analysis can assist in determining cause of death and geographic origins of remains.
Understanding microbial shifts is vital for forensic death investigations.