Group milleri streptococci: significant pathogens in solid organ recipients.

Area of Science:

• Infectious Diseases
• Transplant Surgery
• Microbiology

Background:

• Group Milleri Streptococci (GMS) are a diverse group of bacteria known to cause challenging chronic abscesses.
• These infections are particularly concerning in immunocompromised populations like transplant recipients.

Purpose of the Study:

• To evaluate the epidemiology, clinical significance, and outcomes of GMS infections in solid organ transplant recipients.
• To assess the impact of GMS on patient outcomes and treatment strategies in this vulnerable population.

Main Methods:

• Retrospective analysis of 45 solid organ transplant recipients with GMS isolates between 2001 and 2004.
• Review of patient demographics, infection types, co-pathogens, treatment regimens, and outcomes.

Main Results:

• GMS were frequently isolated from intra-abdominal infections (42 cases) and recurrent cholangitis (17 cases) in liver transplant recipients.
• Concurrent isolation of other pathogens occurred in 61% of GMS-positive specimens.
• No mortality was directly attributed to GMS infection, and most patients responded to combined surgical and antibiotic therapy, though one pancreas graft was lost.

Conclusions:

• Group Milleri Streptococci can cause significant and complex infections in transplant recipients, potentially underestimated in surgical site infections.
• Effective management relies on a combination of surgical intervention and appropriate antibiotic therapy, with GMS showing susceptibility to penicillin G, carbapenems, and clindamycin.