Rodent contamination of soft drinks: An evaluation of postmortem changes

Area of Science:

• Forensic Science
• Toxicology
• Food Safety

Background:

• Rodents discovered in sealed beverages raise questions about contamination sources.
• Distinguishing between pre- and post-bottling contamination is crucial for food safety investigations.

Purpose of the Study:

• To investigate postmortem changes in rodents submerged in various beverages.
• To determine if observed changes indicate contamination during bottling or after opening.

Main Methods:

• Laboratory mice were submerged in different sealed beverages (cola, tea, seltzer, water) for up to two months.
• Postmortem changes, including gas distention, dental erosion, and decomposition, were monitored over time.
• Comparison of experimental findings with necropsy results from rodents found in commercial beverages.

Main Results:

• Sealed carbonated beverages at room temperature caused severe gas distention in submerged rodents within one week.
• Acidic beverages led to incisor erosion, while colored beverages caused staining.
• Decomposition rates varied, being fastest in regular cola.
• Rodents from commercial products lacked gas distention and incisor erosion, showing decomposition similar to short-term experimental submersion.

Conclusions:

• Postmortem changes in rodents found in beverages suggest post-consumer contamination.
• The absence of gas distention and incisor erosion in commercial samples indicates they were not contaminated during the bottling process.
• Findings support the hypothesis that rodents enter beverage containers after they have been opened.