Burkholderia cenocepacia is an environmental Gram-negative bacterium, resistant to many antibiotics and antiseptics, that can survive in aqueous hospital environments. We investigated an outbreak of B. cenocepacia in the intensive care unit (ICU) of Ng Teng Fong General Hospital, aiming to identify the source and prevent further transmission.

The outbreak was detected after two ICU patients developed B. cenocepacia bacteremia. Environmental samples, including ultrasound gels, and disinfectants, were collected. Whole genome sequencing (WGS) was used to determine clonality between clinical and environmental isolates. Immediate actions were taken, including a recall of ultrasound gel batches and the use of sterile gel sachets for high-risk procedures.

Ultrasound gels from opened and unopened bottles from multiple hospital areas, including ICU and Radiology, were found to be contaminated with B. cenocepacia, with a specific batch (Brand A) linked to the outbreak. WGS analysis confirmed the genetic relatedness of clinical and environmental isolates. A hospital-wide recall of affected gel batches was implemented. Through our regional networks, notification of countries in our immediate region along with alerting our local health authorities for further investigation was also undertaken. Additionally, we continued surveillance of gels and identified further contaminated products.

This outbreak highlights the risks of contaminated medical products, specifically ultrasound gels. Effective environmental sampling, rapid identification, and clear communication with health authorities were key to controlling the outbreak. We have since revised our protocols to mandate the use of sterile gel for invasive procedures and continue monitoring for potential contamination in ultrasound gels.

To evaluate performance of registered nurse assessments of the PEN-FAST penicillin allergy clinical decision rule compared to antimicrobial stewardship pharmacists.

Prospective, blinded, non-interventional, quality assurance study.

This study took place across 4 inpatient hospitals within a large health system in Houston, Texas.

We implemented PEN-FAST rule questions into the electronic health record (EHR) for registered nurses to perform. Patients were randomly selected in a prospective fashion, with nurse documented scores hidden, for re-assessment by antimicrobial stewardship pharmacists to compare risk stratification and scores.

Overall agreement of high risk and low risk results was 84.3%. Registered nurse evaluations with the PEN-FAST clinical decision rule for detecting a high-risk patient demonstrated a sensitivity of 67%, specificity of 89.8%, positive predictive value of 67.9%, and negative predictive value of 89.5%. Additionally, 34.4% of patients with a documented penicillin allergy admitted to tolerating amoxicillin or amoxicillin/clavulanate since their last recalled reaction to penicillin.

Registered nurse assessment of the PEN-FAST clinical decision rule demonstrated good performance and can effectively be used to screen for low-risk penicillin allergy patients. Incorporation of the PEN-FAST rule into EHR can be scaled into large health systems to help appropriately stratify patients with low- and high-risk penicillin allergies and improve documentation.

Staphylococcus aureus bacteriuria (SABU) may represent bacteremia in a subset of patients. We describe the impact of a microbiology alert recommending follow-up blood cultures (FUBC) for patients with SABU in a large integrated health system.

We conducted a quasi-experimental implementation study in adult ambulatory patients with documented SABU. We excluded patients with confirmed SAB up to 14 days prior to index SABU culture and with blood cultures obtained on the day of SABU. The primary outcome was rate of FUBC (collected between 1 and 5 days of SABU) among all cases of SABU. Secondary outcomes included percentage of patients with early SAB (collected between 1 and 5 days of SABU). We used interrupted time series analysis to compare rates of FUBC pre vs postintervention.

A total of 2 540 patients were identified; 1 213 (48%) were male. By the end of the postintervention period, the rate of FUBC (20.6%) had increased by 6.3 percentage points (P = .005) compared to the counterfactual (14.2%) had no intervention taken place (44.5% relative increase). Early SAB detection due to FUBC increased from .6% preintervention to 2.0% postintervention (P = .004).

The microbiology alert initiative increased FUBC in patients with SABU by 44%, but the overall rate of FUBC remained low. The intervention increased early SAB detection. Risk-targeted strategies are needed to optimize FUBC collection in patients with SABU.

This study aimed to identify the factors associated with the use of penicillins as the first-choice antimicrobial in Japan’s dental clinics.

Cross-sectional questionnaire-based survey.

Dental clinics throughout Japan.

Dentists at the participating clinics.

Questionnaires were sent to 1,700 dental care facilities in July 2020, and responses were collected until September 2020. The survey gathered data on clinic characteristics, provision of on-site antimicrobial dispensing, choice of antimicrobials, and knowledge regarding antimicrobial resistance (AMR) and infective endocarditis (IE). Descriptive epidemiology and logistic regression analyses were performed to identify the factors associated with on-site dispensing of penicillins and their use as the first-choice antimicrobial.

Responses were obtained from 342 (response rate: 20.1 %) dentists from dental clinics. While 93.9% of respondents were aware of the term “AMR,” only 20.8% were familiar with Japan’s National Action Plan on AMR. AMR countermeasures were implemented in 79.4% of clinics, but 58.4% of respondents lacked awareness of IE guidelines. In the multivariable logistic regression analyses, “adherence to IE guidelines” (odds ratio: 2.56, P = .001) and “clinic stocks ≥2 antimicrobials” (5.02, P = .002) were positively associated with on-site dispensing of penicillins. In contrast, “clinic with ≥2 full-time dentists” (odds ratio: .45, P = .033) was negatively associated with the use of penicillins as the first-choice antimicrobial.

There was a low awareness of the National Action Plan and IE guidelines among dentists. Enhancing educational activities and fostering environments that facilitate collaborative decision-making regarding antimicrobial use may help to improve antimicrobial stewardship in Japan’s dental clinics.

Rapid molecular diagnostics, such as the BIOFIRE® Blood Culture Identification 2 (BCID2) panel, have improved the time to pathogen identification in bloodstream infections. However, accurate interpretation and antimicrobial optimization require Infectious Disease (ID) expertise, which may not always be readily available. GPT-powered chatbots could support antimicrobial stewardship programs (ASPs) by assisting non-specialist providers in BCID2 result interpretation and treatment recommendations. This study evaluates the performance of a GPT-4 chatbot compared to ASP prospective audit and feedback interventions.

This prospective observational study assessed 43 consecutive real-world cases of bacteremia at a 399-bed VA Medical Center from January to May 2024. The GPT-chatbot utilized “chain-of-thought” prompting and external knowledge integration to generate recommendations. Two independent ID physicians evaluated chatbot and ASP recommendations across four domains: BCID2 interpretation, source control, antibiotic therapy, and additional diagnostic workup. The primary endpoint was the combined rate of harmful or inadequate recommendations. Secondary endpoints assessed the rate of harmful or inadequate responses for each domain.

The chatbot had a significantly higher rate of harmful or inadequate recommendations (13%) compared to ASP (4%, p = 0.047). The most significant discrepancy was observed in the domain of antibiotic therapy, where harmful recommendations occurred in up to 10% (p <0.05) of chatbot evaluations. The chatbot performed well in BCID2 interpretation (100% accuracy) but provided more inadequate responses in source control consideration (10% vs. 2% for ASP, p = 0.022).

GPT-powered chatbots show potential for supporting antimicrobial stewardship but should only complement, not replace, human expertise in infectious disease management.

Respiratory syncytial virus (RSV), although frequently reported in pediatric populations, is also associated with significant morbidity and mortality in vulnerable adults. From an Infection Control perspective, it is therefore of particular concern in hospital and long-term care settings.

We report an RSV outbreak that occurred in the memory care unit of a Veterans Affairs-affiliated long-term care facility where the characteristics of the resident population posed unique challenges to halting transmission.

The outbreak occurred in a 30-bed unit within a 230-bed Veterans Affairs-affiliated long-term care facility in Florida.

An investigation was performed in coordination with the local Department of Health. All residents on the affected unit had dementia with resulting difficulty participating in infection prevention measures, including isolation, masking, and hand hygiene. Interventions implemented included twice weekly RSV testing, enhanced cleaning protocols, staggered mealtimes/outdoor dining, and cancellation of group activities, visitations, and new admissions. A retrospective case–control study was performed to assess for potential risk factors for acquiring RSV.

Over a 21-day period in 2022, 20 out of 29 residents tested positive for RSV within the affected unit. No other units were involved. Univariate analysis did not find any statistically significant risk factors for acquiring RSV infection, although small sample size may have impacted the results.

A multifaceted approach was ultimately successful in preventing ongoing transmission of RSV within and beyond the unit. The infection control techniques utilized in this unique patient population could potentially be applicable to challenging outbreak situations at other facilities.

Routine immunization programs may reduce antibiotic use, but few studies have comprehensively examined their impact on antibiotic utilization. We aimed to explore temporal trends in vaccination and antibiotic use among young children in the United States.

Ecological study using the Merative® MarketScan Commercial Claims and Encounters database.

We analyzed claims data on pediatric vaccine uptake (pneumococcal conjugate, Haemophilus influenzae type b, diphtheria-tetanus-pertussis, and influenza) and antibiotic prescriptions and antibiotic-treated respiratory tract infections among US children <5 years during 2000–2019. Vaccination status was assessed annually, and children were categorized based on receipt of all four vaccines, 1–3 vaccines, or no vaccines. Antibiotic prescriptions were classified by spectrum and drug class. Respiratory infections included otitis media, pharyngitis, pneumonia, sinusitis, and viral infections.

Among 6.7 million children, vaccine uptake increased from 32.5% receiving all four vaccines in 2004 to 66.8% in 2019. During this period, overall antibiotic prescriptions decreased from 1.89 to 1.01 per person-year, with the greatest reductions in macrolides (73.3%) and broad-spectrum antibiotics (57.0%). Antibiotic-treated respiratory tract infections declined from 2.43 to 1.61 episodes per person-year, with the largest decreases in sinusitis (64.7%) and pharyngitis (39.8%).

The findings suggest a temporal association between routine childhood immunization uptake and reduced antibiotic utilization. Although immunization programs are primarily aimed at protecting children from vaccine-preventable diseases, their potential role in complementing antimicrobial stewardship efforts and other factors influencing antibiotic reduction warrants further investigation through more rigorous study designs.

To estimate the cost-effectiveness of methicillin-resistant Staphylococcus aureus (MRSA) nares poymerase chain reaction (PCR) use in pediatric pneumonia and tracheitis.

We built a cost-effectiveness model based on MRSA prevalence and probability of empiric treatment for MRSA pneumonia or tracheitis, with all parameters varied in sensitivity analyses. The hypothetical patient cohort was <18 years of age and hospitalized in the pediatric intensive care unit for community-acquired pneumonia (CAP) or tracheitis. Two strategies were compared: MRSA nares PCR-guided antibiotic therapy versus usual care. The primary measure was cost per incorrect treatment course avoided. Length of stay and hospital costs unrelated to antibiotic costs were assumed to be the same regardless of PCR use. Both literature data and expert estimates informed sensitivity analysis ranges.

When estimating the health care system willingness-to-pay threshold for PCR testing as $140 (varied in sensitivity analyses) per incorrect treatment course avoided, reflecting estimated additional costs of MRSA targeted antibiotics, and MRSA nares PCR true cost as $64, PCR testing was generally favored if empiric MRSA treatment likelihood was >52%. PCR was not favored in some scenarios when simultaneously varying MRSA infection prevalence and likelihood of MRSA empiric treatment. Screening becomes less favorable as MRSA PCR cost increased to the highest range value of the parameter ($88). Individual variation of MRSA colonization rates over wide ranges (0% – 30%) had lesser effects on results.

MRSA nares PCR use in hospitalized pediatric patients with CAP or tracheitis was generally favored when empiric MRSA empiric treatment rates are moderate or high.

This study evaluated Medicaid claims (MC) data as a valid source for outpatient antimicrobial stewardship programs (ASPs) by comparing it to electronic medical record (EMR) data from a single academic center.

This retrospective study compared pediatric patients’ MC data with EMR data from the Marshall Health Network (MHN). Claims were matched to EMR records based on patient Medicaid ID, service date, and provider NPI number. Demographics, antibiotic choice, diagnosis appropriateness, and guideline concordance were assessed across both data sources.

The study was conducted within the MHN, involving multiple pediatric and family medicine outpatient practices in West Virginia, USA.

Pediatric patients receiving care within MHN with Medicaid coverage.

MC and EMR data showed >90% agreement in antibiotic choice, gender, and date of service. Discrepancies were observed in diagnoses, especially for visits with multiple infectious diagnoses. MC data demonstrated similar accuracy to EMR data in identifying inappropriate prescriptions and assessing guideline concordance. Additionally, MC data provided timely information, enhancing the feasibility of impactful outpatient ASP interventions.

MC data is a valid and timely resource for outpatient ASP interventions. Insurance providers should be leveraged as key partners to support large-scale outpatient stewardship efforts.