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Abstract Background Stigma associated with tuberculosis (TB) and TB diagnosis is a major social factor in delay of diagnosis and non-adherence to TB treatment among Asian American and Pacific Islander (AAPI) populations. Main sources of stigma include misconceptions regarding TB transmission and lack of knowledge about symptoms or treatment.Figure 1.Respondent demographicsBreakdown of respondent demographics by age, gender, and AAPI subgroup.Figure 2.Demographic breakdown of TB awarenessTB awareness by AAPI subgroup, age, and gender. Methods A cross-sectional survey of 666 AAPI individuals analyzed TB symptom recognition, transmission misconceptions, and awareness in two AAPI community centers. Data were segmented by AAPI subgroup, metropolitan area (Seattle/Tacoma vs. Las Vegas), age, and gender.Figure 3.TB transmission beliefs.Figure 4.TB treatment, curability, and latent TB infection awareness. Results Overall, 76.6% of respondents reported TB awareness, varying by AAPI subgroup. Awareness was highest among Korean (95%) and Filipino (91%) participants, and lowest among Vietnamese (52%) and Cambodian (50%) respondents. Regionally, TB awareness was similar between Tacoma (76%) and Las Vegas (79%). Age and gender significantly impacted awareness. Respondents under 18 had the lowest TB awareness (59%), while those aged 18-34 had the highest (84%). Females reported higher TB awareness (79%) and symptom recognition (61%) than males (74% and 46%, respectively). Symptom knowledge varied. 55% were aware of TB symptoms, but only 16% were able to recognize five common TB symptoms. Misconceptions about transmission also persisted broadly. Out of the 71% of respondents who were aware that TB is transmissible, many incorrectly believed TB spread via shaking hands (35%), sharing food/drinks (50%), or touching items in public areas (37%). The 45-64 and 65+ age groups were most prone to misconceptions about transmission. While 72% of respondents were aware that TB could be treated, only 57% knew TB could be cured. 30% of respondents were aware of latent TB infection. Conclusion Significant disparities in TB awareness exist in AAPI communities. Females demonstrated greater TB awareness perhaps due to cultural differences (“caretaker role”), while TB transmission misconceptions were prevalent among older individuals. Limited knowledge on LTBI and TB treatment represent significant barriers to effective TB control. Tailored educational efforts will be required to improve TB awareness and reduce misconceptions within AAPI communities. Disclosures All Authors: No reported disclosures

Aerosol viral transmission monitoring enables early, noninvasive detection of infectious disease spread by identifying airborne viral particles in shared environments. Integrating sampling, sensing, and data analysis, this perspective outlines an integrated framework for transforming epidemic responses from reactive testing to proactive surveillance. It synthesizes current technological advances and deployment experiences to identify key challenges in detection efficiency, data management, and societal trust. This marks a shift from clinical diagnosis to environmental surveillance, transforming epidemic responses from testing individuals to monitoring shared air. By enabling earlier interventions, these systems help reduce transmission, protect vulnerable groups, and limit disruptions to daily life and the economy.

Abstract Cardiac implantable electronic device infection in the context of corynebacterial bloodstream infection (BSI) remains poorly understood. From 2012 to 2023 at Mayo Clinic, 4 of 12 patients with corynebacterial BSI had cardiac implantable electronic device infection: 1 patient was diagnosed during a relapsing BSI episode. Undefined source, persistent BSI, and the presence of a prosthetic cardiac valve were common characteristics.

Abstract Background We aimed to determine the factors associated with sequential blood culture time to positivity (STTP) and validate the previously defined time to positivity (TTP) ratio threshold of 1.5 in predicting adverse disease outcomes and mortality of Staphylococcus aureus bacteremia (SAB). Methods We conducted an observational study of adult patients with SAB. The TTP ratio was calculated by dividing the TTP of the second blood culture by that of the first. Results Of 186 patients, 69 (37%) were female, with a mean age of 63.6 years. Median TTP was 12 hours (interquartile range [IQR], 10–15 hours) from the initial and 21 hours (17–29) from sequential blood cultures. Methicillin-resistant S aureus (MRSA)–infected patients had significantly shorter STTPs (P < .001) and lower TTP ratios (P < .001) compared to patients with methicillin-susceptible S aureus (MSSA). A significant correlation between initial and STTP was observed in patients with MRSA (r = 0.42, P = .002) but not in those with MSSA. A higher rate of native valve endocarditis (NVE) significantly correlated with a TTP ratio of ≤1.5 (odds ratio, 2.65 [95% confidence interval, 1.3–5.6]; P = .01). The subgroup having an initial TTP <12 hours combined with a TTP ratio ≤1.5 showed the highest prevalence of NVE. Conclusions The STTP varies based on methicillin susceptibility of S aureus isolate. This study suggests a potential clinical utility of the STTP to identify patients at a higher risk of NVE. However, prospective studies are required to validate these findings.

Abstract Background In contrast to bloodstream infection due to a variety of bacteria in patients with cardiovascular implantable electronic devices (CIED), there are limited data regarding candidemia and risk of CIED infection. Methods All patients with candidemia and a CIED at Mayo Clinic Rochester between 2012 and 2019 were reviewed. Cardiovascular implantable electronic device infection was defined by (1) clinical signs of pocket site infection or (2) echocardiographic evidence of lead vegetations. Results A total of 23 patients with candidemia had underlying CIED; 9 (39.1%) cases were community onset. None of the patients had pocket site infection. The duration between CIED placement and candidemia was prolonged (median 3.5 years; interquartile range, 2.0–6.5). Only 7 (30.4%) patients underwent transesophageal echocardiography and 2 of 7 (28.6%) had lead masses. Only the 2 patients with lead masses underwent CIED extraction, but device cultures were negative for Candida species. Two (33.3%) of 6 other patients who were managed as candidemia without device infection subsequently developed relapsing candidemia. Cardiovascular implantable electronic device removal was done in both patients and device cultures grew Candida species. Although 17.4% of patients were ultimately confirmed to have CIED infection, CIED infection status was undefined in 52.2%. Overall, 17 (73.9%) patients died within 90 days of diagnosis of candidemia. Conclusions Although current international guidelines recommend CIED removal in patients with candidemia, the optimal management strategy remains undefined. This is problematic because candidemia alone is associated with increased morbidity and mortality as seen in this cohort. Moreover, inappropriate device removal or retention can both result in increased patient morbidity and mortality.

AbstractPurposeEmerging literature has detailed the safe use of cefazolin in patients with immunoglobulin E–mediated penicillin allergy labeling (PAL) such as hives and anaphylaxis. The purpose of this article is to detail efforts led by an antimicrobial stewardship pharmacist working with an interdisciplinary team to optimize preoperative antimicrobials in patients with PAL.MethodsA pharmacist-led, interdisciplinary collaborative practice agreement (CPA) was activated in January 2020 to permit pharmacists to independently optimize preoperative antibiotics to the preferred cefazolin in patients with PAL if nonsevere or severe reactions had been reported. A patient registry was established covering the timeframe between January 8, 2020, and January 6, 2022. Reaction during surgery was assessed via 2-provider documentation, which included surgeon and anesthesiology staff documentation of any complications during the procedure related to a suspected allergic safety event. Utilization of cefazolin, clindamycin, and vancomycin for preoperative prophylaxis was monitored before and after implementation of the CPA.ResultsDuring the stated timeframe, 10,182 procedures and/or surgeries were completed on 1,572 (15.4%) patients with PAL and 659 (41.9%) patients previously reporting at least one reaction categorized as a severe reaction, which was hives for 71.2% of these patients. Of the 659 patients with PAL reporting a severe reaction, 356 received a preoperative cephalosporin (cefazolin, 98.8%; ceftriaxone, 1.2%) and tolerated it without a reported safety event, including 52 patients with PAL previously reporting anaphylaxis. An increase in preferred preoperative antimicrobial prophylaxis utilization was noted (cefazolin: 86% to 96.3%, P < 0.001; 2019 to 2021) with reductions noted in the use of nonpreferred preoperative antibiotics (clindamycin: 2.1% to 0.2%, P < 0.001; vancomycin: 3.2% to 0.4%, P < 0.001; 2019 to 2021).ConclusionA pharmacist-led, interdisciplinary CPA increased preferred preoperative antimicrobial use in patients with PAL reporting severe allergic reactions, including hives and anaphylaxis, without reported safety events.

Abstract Background The role of sequential blood culture time to positivity (TTP) as a surrogate marker for bacterial load and as a prognostic indicator in S. aureus bacteremia (SAB) is not well established in the literature. Methods We performed a single healthcare system, multi-site, retrospective review of adult patients with positive blood culture for S. aureus between January 2019 and December 2019. Sequential TTP was defined as the TTP of the first subsequent blood cultures obtained from patients with SAB for at least 24 hours. We adapted the previously described TTP ratio of < 1.5 as the cut-off for study groups. Infective endocarditis (IE) was defined according to modified Duke’s criteria. High-grade bacteremia was defined as the growth of the organism in two or more sets of blood cultures or growth in >50% of all bottles collected. Descriptive, comparative statistics and survival analysis were performed using Python 3 and IBM SPSS Statistics for Windows, Version 27.0. Armonk, NY: IBM Corp. Results A total of 602 patients with SAB were identified, and 186 patients who met the study criteria were included. Sixty-nine patients (37%) were female, and the mean age was 63.6 years. Patients with initial TTP < 12 hours had higher 30-day and 90-day mortality than those with initial TTP ≥ 12 hours. Patients with TTP ratio of > 1.5 had higher rates of cardiac prosthetic device (30 [26.1%] vs. 9 [12.7%], p = .03) and high-grade bacteremia (106 [92.2%] vs. 56 [78.9%], p = .01). In univariate analysis, history of myocardial infarction, cardiac prosthetic device, and findings of high-grade bacteremia and native valve vegetation in echocardiogram were significant predictors for a TTP ratio of < 1.5. In multivariate analysis, native valve vegetation (OR 2.4; 95% CI 1.2-4.84), and high-grade bacteremia (OR, 0.3; 95% CI, 0.13- 0.77) were independent predictors (Table 1 and 2). No differences in 30- day or 90-day survival based on the TTP ratio were seen (Figure 1). Figure 1.Kaplan-Meier (KM) curves and log rank test results based on time to positivity (TTP) of initial blood cultures and TTP ratio of sequential to initial blood culture The X-axis represents the days elapsed from the initial blood culture collection. Number of patients at risk and events are given below the x-axis for each group. 30-day and 90-day survival rates were significantly lower in patients with initial TTP of < 12 hours compared with those with ≥ 12 hours. There were no statistically significant differences in survival based on TTP ratio. Conclusion In patients with SAB, a second TTP to first TPP ratio of > 1.5 was associated with higher rates of presence of the cardiac prosthetic device and high-grade bacteremia. Initial TTP < 12 hours was associated with lower survival; however sequential TTP ratio didn’t predict mortality. Disclosures All Authors: No reported disclosures.

Abstract Background Cardiovascular implantable electronic devices (CIED) infection carries significant morbidity, mortality, and financial burden. Bacteremia in patients with CIED increases risk of CIED infection. While several investigations have examined Staphylococcus aureus bacteremia and risk of CIED infection, data regarding non-S. aureus gram-positive coccal (non-SA GPC) bacteremia in patients with CIED has been both limited and dated. The current study examined the clinical characteristics of patients with CIED who developed non-SA GPC bacteremia and their proclivity of CIED infection. Methods We reviewed all patients with CIED who developed non-SA GPC bacteremia at Mayo Clinic between 2012–2019. Cases with a left ventricular assist device, non-hospitalization, and contaminated blood culture were excluded. The 2019 European Heart Rhythm Association International Consensus Document was used to define CIED infection. Results A total of 160 patients with CIED developed non-SA GPC bacteremia during the period. Ninety (56.2%) patients had CIED infection, with 60 (37.5%) classified as definite and 30 (18.8%) possible. This included 41/64 (64.1%) patients with coagulase-negative Staphylococcus (CoNS), 30/41 (73.2%) patients with Enterococcus, 13/19 (68.4%) patients with viridans group streptococci (VGS), and 6/36 (16.6%) patients with other non-SA GPC. The odds of CIED infection (with 95% CI) for CoNS, Enterococcus, and VGS bacteremia were 8.9 (3.2–24.6), 13.6 (4.5–41.6), and 10.8 (2.9–40.0) -fold higher, respectively, as compared to other non-SA GPC. Among those with infected CIED, 51 (56.7%) patients underwent complete device extraction after a median of 6 (IQR 3.5–10) days. In an unadjusted analysis of patients with CIED infection, the reduction in one-year mortality following device removal was not statistically significant (HR 0.59, 95% CI 0.26–1.33, p=0.198). Conclusion The overall prevalence of CIED infection following non-SA GPC bacteremia was higher than previously reported, particularly that due to CoNS, Enterococcus, and VGS. Further study with a larger cohort is needed to demonstrate the survival benefit from CIED extraction in patients with infected CIED due to non-SA GPC. Disclosures Larry M. Baddour, M.D., Boston Scientific: Advisor/Consultant|Botanix Pharmaceuticals: Advisor/Consultant|Roivant Sciences: Advisor/Consultant|UpToDate, Inc.: Royalty payments - authorship duties Rizwan Sohail, M.D., Aziyo Biologics: Advisor/Consultant|Boston Scientific: Advisor/Consultant|Medtronic: Advisor/Consultant|Philips: Advisor/Consultant|Philips: Honoraria Malini Madhavan, M.B.B.S., Biosense Webster: Advisor/Consultant|Biotronik Inc: Advisor/Consultant|Boston Scientific: Grant/Research Support|Convatec: Advisor/Consultant.

Abstract Background Gram-negative bacteremia (GNB) as a manifestation of cardiovascular implantable electronic device (CIED) infection is uncommon. Moreover, echocardiography may be nonspecific in its ability to differentiate whether CIED lead masses are infected. We aimed to determine the rate of CIED infection in the setting of GNB. Methods All patients with CIED who were hospitalized with GNB during 2012–2019 at Mayo Clinic were investigated. The definition of CIED infection was based on criteria recommended by the 2019 European Heart Rhythm Association document. Results A total of 126 patients with CIED developed GNB. None of them had signs of pocket infection. Twenty (15.9%) patients underwent transesophageal echocardiography. Overall, 4 (3%) patients had definite CIED infection. None of them underwent CIED extraction; 3 died within 12 weeks and 1 received long-term antibiotic suppression. Ten (8%) patients had possible CIED infection; despite no CIED extraction, no patient had relapsing GNB. We observed a higher rate of CIED infection in patients with Serratia marcescens bacteremia as compared to that in patients with other GNB. Conclusions The rate of CIED infection following GNB was relatively low. However, accurate classification of CIED infection among patients presenting with GNB remains challenging, in part, due to a case definition of CIED infection that is characterized by a low pretest probability in the setting of GNB. Prospective, multicenter studies are needed to determine accurate identification of CIED infection among GNB, so that only patients with true infection undergo device removal.

Abstract Background Population-based studies of Staphylococcus aureus bacteremia (SAB) in the United States are limited. We provide a contemporary evaluation of SAB incidence in Olmsted County, Minnesota, from 2006 to 2020. Methods This was a retrospective population-based study of all adult patients with SAB residing in Olmsted County from 1 January 2006 through 31 December 2020. Initial episodes of SAB were identified using the microbiology laboratory databases at both Olmsted Medical Center and Mayo Clinic Rochester. Results Overall, 541 incident SAB cases were identified with a median age of 66.8 (interquartile range, 54.4–78.5) years, and 60.4% were male. Among these cases, 298 (56.2%) were due to methicillin-susceptible S aureus (MSSA) and 232 (43.8%) cases of methicillin-resistant S aureus (MRSA). The overall age- and sex-adjusted SAB incidence rate (IR) was 33.9 (95% confidence interval [CI], 31.0–36.8) cases/100 000 person-years (PY). Males had a higher age-adjusted IR of 46.0 (95% CI, 41.0–51.0) cases/100 000 PY compared to females (IR, 24.4 [95% CI, 21.1–27.7] cases/100 000 PY). Age- and sex-adjusted SAB IRs due to MSSA and MRSA were 18.7 and 14.6 cases/100 000 PY, respectively, and the percentage of incident SAB cases due to MRSA fluctuated across the study period. There was no apparent temporal trend in SAB incidence over the study period (P = .093). Conclusions Our investigation represents the only contemporary population-based study in the United States. Despite the impression that SAB incidence may have increased based on Centers for Disease Control and Prevention surveillance data, our finding of no change in SAB incidence was somewhat unanticipated.