The Bloody Polenta: A Century of Serratia marcescens

From the 'bloody polenta' incident of 1819 to 20th-century biowarfare experiments, Serratia marcescens, a bacterium renowned for its striking red pigment, has left an indelible mark on science, medicine, and culture. Mistakenly implicated in 'miraculous blood' events, it's been used to study germ dispersal and even deployed as a biological weapon. Despite some strains' pathogenicity, it plays a vital role in immunotherapeutic and antimicrobial research, with its red pigment, prodigiosin, boasting diverse biomedical applications. This article recounts the century-long saga of this 'miracle bacterium', unveiling its fascinating and often overlooked scientific story.