Injection site abscess in an immunocompromised patient caused by non-pigmented strain of Serratia marcescens

Serratia marcescens commonly causes infections of the respiratory tract, urinary tract, septicaemia and wound infections. It is an opportunistic Gram-negative pathogen causing infections commonly in the immunocompromised patients. However, skin infections caused by Serratia marcescens are unusual. Moreover, infection by non-pigmented strains are less common as compared to those by pigmented strains. We describe a case of an elderly immunocompromised female presenting with abscess formation at the site of insulin injection caused by non-pigment producing Serratia marcescens. She responded to treatment with antibiotics.

Keywords: Abscess, immunocompromised, non-pigmented, Serratia marcescens.