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In forensic medical work, in cases with homicide suspicion, it is important to be able to determine with the greatest possible precision when injuries occurred and whether during vital, or post-mortem conditions. Although several markers of vitality can be employed, it has been attested that components of the extra-cellular matrix, such as fibrin, are among the earliest to be evidenced. In the present study, the histological-histochemical Mallory's Trichrome staining method, previously selected was tested to determine the presence of vital reaction in Wistar rats through fibrin accumulation by testing three short reaction time intervals: 15, 30 and 60 minutes after the skin wound infliction. For all time intervals tested, including the shortest (15 minutes), the presence of fibrin at the edges of the skin wound was evidenced. The accumulation of fibrin was, nevertheless, more pronounced at 30 and 60 minutes after the wound. It could be concluded that fibrin is a good marker for vital reaction and that it can be detected very early, within a few minutes after the injury. It is proposed that histological method coupled to the histochemical staining technique here tested can be incorporated into routine forensic work as a tool for evidencing the existence or not of vital reaction

Histological analysis of short-term vital reactions in skin wounds: potential applications in forensic work