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Shewanella haliotis is a gram-negative rod that grows in small yellow-brown mucoid colonies and was first identified from abalone gut flora in 2007 and has been isolated in China, Japan, South Korea, and Thailand. In December 2018, an 87-year-old man was evaluated at a Flushing, New York, hospital for lower-right abdominal pain. Computed tomography showed appendiceal abscesses, and percutaneous drainage of the abscesses revealed a cloudy jelly-like substance. An organism was isolated and identified by 16S ribosomal sequencing as Shewanella haliotis. Drug testing indicated susceptibility to aminoglycosides, fluoroquinolones, broad-spectrum cephalosporins, and some penicillins. Empiric treatment with intravenous piperacillin-tazobactam was su…