What growth characteristic aids the detection of Yersinia enterocolitica in clinical specimens?

• A. Growth at cold temperatures (cold enrichment)
• B. Growth only at high temperatures
• C. Requirement for high-salt media
• D. Growth in anaerobic conditions

Answer: (D)

Growth at cold temperatures is the trait that makes detection easier. Yersinia enterocolitica is able to multiply at refrigeration temperatures (around 4°C), while many competing gut bacteria are inhibited. By using cold enrichment, specimens are kept cold to selectively boost Yersinia’s numbers, improving the chance of recovery on selective media. It’s worth noting that Yersinia is a facultative anaerobe and can grow with or without oxygen, so anaerobic growth isn’t the enabling factor here. Relying on growth at high temperatures wouldn’t exploit its ability to thrive in the cold.