Distinction of Fly Artifacts from Human Blood using Immunodetection

Area of Science:

• Forensic Entomology
• Biochemistry
• Immunology

Background:

• Insect stains from necrophagous flies are morphologically identical to human bloodstains.
• Current forensic methods lack a diagnostic test to distinguish between these stain types.

Purpose of the Study:

• To develop the first chemical test for identifying fly artifacts.
• To generate specific antibodies against a fly enzyme for diagnostic purposes.

Main Methods:

• Polyclonal antisera were generated in rats against antigenic sequences of fly cathepsin D-like proteinase.
• Immunoassays were used to test the binding of antisera to fly artifacts and mammalian blood.

Main Results:

• Rat antisera successfully bound to artifacts from Protophormia terraenovae and synthetic peptides.
• The antisera did not cross-react with any tested mammalian blood.
• Anti-md3 serum showed the highest reactivity for fly stains and bound artifacts from the fly digestive tract.

Conclusions:

• The developed rat antisera show promise for distinguishing fly artifacts from human bloodstains.
• Further research is required to validate the antisera for field use in forensic science.