Shewanella algae, an Emerging Pathogen, Causing Skin and Soft Tissue Infections

Shewanella species, gram-negative saprophytic bacteria, are frequently found in warmer marine environments and soil. Among the Shewanella genus, Shewanella algae and Shewanella putrefaciens cause human infections, with S. algae being more common. Shewanella species are opportunistic bacteria and are being identified as potential pathogens causing wide range of illnesses in both immunocompromised and immunocompetent patients. Diagnosis can be difficult because of limited awareness and microbiologic data. However, high index of clinical suspicion and history of recent exposure to marine environments can help in facilitating early diagnosis. Delay may lead to sepsis and multiorgan failure. Infections can be identified in cases without exposure to aquatic environments, as seen in our case. A 39-year-old man with no marine exposure presented with progressively worsening lower extremity cellulitis with positive wound cultures for S. algae. We aim to increase awareness of this rare emerging pathogen so that treatment can be tailored rapidly and appropriately.