Evidence of transmission of New Delhi metallo-ß-lactamase-producing Klebsiella pneumoniae through a gastrointestinal endoscope without an elevator channel.

OBJECTIVE: To investigate the source and transmission dynamics of an endoscope-associated New Delhi metallo-ß-lactamase-producing Klebsiella pneumonia (NDM-KP) outbreak. DESIGN: Epidemiological and genomic investigation. SETTING: Academic acute care hospital in New Jersey. PATIENTS: Five patients with active NDM-KP infection identified on clinical isolates, and four NDM-KP colonized patients identified via rectal swab screening. RESULTS: Over a twelve-month period, nine patients were identified with NDM-KP infection or colonization. Whole-genome sequencing (WGS) revealed that all of the identified cases were related by 25 mutational events or less. Seven of the cases were linked to gastrointestinal endoscopic procedures (four clinical cases and three positive screens among patients exposed to endoscopes suspected of transmission). Two cases demonstrated delayed transmission that occurred five months after the initial outbreak, likely through shared usage of a non-therapeutic gastroscope without an elevator channel. CONCLUSIONS: Although all endoscope cultures in our investigation were negative, the epidemiological link to gastrointestinal endoscopes, the high degree of relatedness via WGS, and the identification of asymptomatic NDM-KP colonization among patients exposed to shared endoscopes make the endoscopic mode of transmission most likely. This investigation highlights the probable transmission of NDM-KP via a gastroscope without an elevator channel, observed several months after an initial outbreak. We hypothesize that persistent mechanical defects may have contributed to the delayed device-related transmission of NDM-KP.

Ceftaroline as salvage therapy for complicated MRSA bacteremia: case series and analysis.

INTRODUCTION: Methicillin-resistant Staphylococcus aureus (MRSA) bloodstream infection (BSI) is a major cause of morbidity and mortality in hospitalized patients. Ceftaroline fosamil (CPT) is the only available beta-lactam antibiotic with in vitro and in vivo activities against MRSA. There is currently limited clinical experience with CPT in complicated MRSA BSI. MATERIALS AND METHODS: We report a series of eight patients, including three whose strains had reduced susceptibility to vancomycin. RESULTS: CPT monotherapy was successfully used as salvage therapy for complicated MRSA BSI. The median time to documented clearance was 7 days. CONCLUSION: Ceftaroline monotherapy is effective for clearance of refractory MRSA BSI related to implanted devices, endocarditis, and orthopedic infections.

Do Positive Anaerobic Culture Results Affect Physicians' Clinical Management Decisions?

BACKGROUND: Aerobic and anaerobic cultures from body fluids, abscesses, and wounds are ordered routinely. Prior studies have shown that the results of anaerobic blood cultures do not frequently lead to changes in patient management. METHODS: We performed a retrospective chart review to determine whether positive results of anaerobic tissue and fluid cultures (excluding blood) affect physicians' treatment approaches. Of 3234 anaerobic cultures, 174 unique patient admissions had positive cultures and met inclusion criteria. RESULTS: Only 18% (n = 31) of patient charts with positive cultures had documented physician acknowledgment (90.3% of acknowledgments by infectious diseases physicians), with 9% (n = 15) leading to change in antibiotic regimens based on results. Seventy percent of all patients received initial empiric antibiotics active against anaerobes. Of the remaining 30% (inappropriate, unknown, or no empiric coverage), 1 regimen change was documented after culture results were known. CONCLUSIONS: Given the lack of management change based on results of anaerobic wound cultures, the value of routine anaerobic culturing is of questionable utility.

Multiple cerebral infarcts due to varicella-zoster virus large-vessel vasculopathy in an immunocompetent adult without skin involvement.

We report the case of a 52-year-old immunocompetent man with varicella-zoster virus large-vessel vasculopathy and multiple bilateral cerebral infarcts who had no history of skin involvement. Etiologic diagnosis was made by isolation of varicella-zoster virus from a cerebrospinal fluid specimen. The patient had marked improvement in mental status after acyclovir therapy was initiated.