Case study: Red pupae on the corpse of an alcoholic

1. 14th AUG 1996, 46 years old alcoholic found dead in bedroom.
2. —Blood Alcohol Concentration (BAC) was calculated and he had a history of high blood pressure.
3. —Corpse was bloated decay.
4. —Clusters of eggs found on beard and pubic hair.
5. —Fly larvae of 2-3mm found mainly under skin bladders.
6. —Lucilia ceasar LINNE females ovipositing onto the body.
7. —Two dark red pupae of 6mm found adhering to the abdomen of corpse.
8. —Pupae and two adult Muscina Stabulans FALLEN flies of 9mm emerged 14 days later.
9. —28th AUG 1996, Muscina Stabulans developed within 28 days from egg to adult larvae.
10. —The larvae were crushed and tested for bacteria.

The analysis result show that 

The red colour of the pupae and red spots on the slightly moist paper towels on which the pupae were laid appear to be caused by Serratia marcescens (Enterobacteriaceae). 

This bacterium known to cause wound infection and sepsis in people whose immune system is compromised ,a reason for this is that S. marcescens is often resistant to antimicrobial substances 

An illness or infection caused by or followed by the occurence of S. marcescens together with unconsciousness could be an explanation for the occurence of Muscina stabulans larvae on the alcoholic before he died.