Blood-Fed Mosquitoes Could Provide Human DNA Evidence for Forensic Identification

A study published in Scientific Reports on 29 September 2026 has investigated whether blood-feeding insects can preserve usable human DNA for forensic identification. The findings suggest that mosquitoes collected at a scene may provide an additional source of DNA evidence when conventional biological samples are unavailable.

Researchers evaluated two commercial short tandem repeat (STR) profiling kits using three insect species: Culex pipiens and Anopheles stephensi mosquitoes, and Phlebotomus papatasi sand flies. STR analysis examines variations at specific DNA regions and is widely used in forensic human identification.

The team assessed how the time elapsed after feeding affected DNA profiling, testing insects at 12-hour intervals for up to 72 hours. Both kits consistently generated complete DNA profiles from blood-fed mosquitoes under the study conditions. Complete profiles were obtained up to 60 hours after feeding in Culex pipiens and up to 48 hours in Anopheles stephensi.

Sand flies produced only partial profiles, demonstrating that the usefulness of insect-derived DNA depends on the species. Researchers also tested mixed blood meals and several preservation methods. Mixed feeding did not substantially change the observed detection windows in the mosquito species examined.

The results indicate that insects collected from a location could potentially help investigators identify people whose blood they have consumed. This may be particularly useful when a scene contains few conventional biological traces or when insects are recovered during an investigation.

However, the study does not establish that insect-derived DNA can independently identify a person in every case. DNA degradation, insect species, feeding history, contamination and laboratory conditions can affect results. Further validation would be required before the approach could be routinely adopted in forensic casework.