Serratia marcescenshas rarely been reported as an agent of invasive disease in patients presenting from the community. Furthermore,S marcescensis frequently opportunistic, affecting individuals with serious medical comorbidities including immune suppression and diabetes. A case of a community-acquiredS marcescensspontaneous lumbar epidural abscess presenting as cauda equina syndrome is reported in a previously well 36-year-old man with no identifiable risk factors. To the authors’ knowledge, this is the first report of invasiveS marcescenscausing disease in a patient with no medical comorbidities.