What organism is identified in blood cultures from a septic patient who received packed RBCs?

The identification of Yersinia enterocolitica in blood cultures from a septic patient who received packed red blood cells is notable, as this organism is known to be associated with certain types of transfusion-related infections. Y. enterocolitica can cause sepsis, particularly in immunocompromised individuals or those with underlying health conditions, making it a concern in patients receiving transfusions.

This organism is typically associated with the consumption of contaminated food, particularly undercooked pork or unpasteurized milk, but it can also be involved in bloodstream infections, especially in scenarios where the patient’s immune system is compromised. The risk of transfusion-transmitted infections emphasizes the importance of careful screening and monitoring of blood products.

In contrast, the other organisms listed, while they can also be involved in septicemia, are less commonly linked to transfusion-related infections. Their epidemiology and associations with specific clinical scenarios differ. For example, Escherichia coli and Enterobacter cloacae are more often involved in infections arising from urinary tract infections or intra-abdominal infections, while Citrobacter freundii is commonly seen in a variety of clinical contexts but is less frequently noted in direct relation to blood transfusion complications. Thus, the identification of Yers