Obtaining Blood Cultures Research Articles

Abnahme von Blutkulturen

The detection of living microorganisms in the blood of a patient is of major diagnostic and prognostic importance. Blood cultures are the goldstandard in the diagnosis of BSIs (bloodstream infections). The "How to do: Blood culture collection" article provides a step-by-step approach to this method. The importance of obtaining blood cultures, indications and common pitfalls are explained in this teaching manuscript.

Improvement methodology increases guideline recommended blood cultures in children with pneumonia.

A national evidence-based guideline for the management of community-acquired pneumonia (CAP) in children recommends blood cultures for patients admitted with moderate to severe illness. Our primary aim was to increase ordering of blood cultures for children hospitalized with CAP from 53% to 90% in 6 months. The secondary aim was to evaluate the effect of obtaining blood cultures on length of stay (LOS). At a tertiary children's hospital, interventions to increase blood cultures focused on 3 key drivers and were tested separately in the emergency department and inpatient units by using multiple plan-do-study-act cycles. The impact of the interventions was tracked over time on run charts. The association of ordering blood cultures and LOS was estimated by using linear regression models. Within 6 months, the percentage of patients admitted with CAP who had blood cultures ordered increased from 53% to 100%. This change has been sustained for 12 months. Overall, 239 (79%) of the 303 included patients had a blood culture ordered; of these, 6 (2.5%) were positive. Patients who had a blood culture did not have an increased LOS compared with those without a blood culture. Quality improvement methods were used to increase adherence to evidence-based national guidelines for performing blood cultures on children hospitalized with CAP; LOS did not increase. These results support obtaining blood cultures on all patients admitted with CAP without negative effects on LOS in a setting with a reliably low false-positive blood culture rate.

Routine blood cultures in the management of pyelonephritis in pregnancy for improving outcomes.

Pyelonephritis is a type of urinary tract infection (UTI) that affects the upper urinary tract and kidneys, and is one of the most common conditions for hospitalisation among pregnant women, aside from delivery. Samples of urine and blood are obtained and used for cultures as part of the diagnosis and management of the condition. Acute pyelonephritis requires hospitalisation with intravenous administration of antimicrobial agents. Several studies have questioned the necessity of obtaining blood cultures in addition to urine cultures, citing cost and questioning whether blood testing is superfluous. Pregnant women with bacteraemia require a change in the initial empirical treatment based on the blood culture. However, these cases are not common, and represent approximately 15% to 20% of cases. It is unclear whether blood cultures are essential for the effective management of the condition. To assess the effectiveness of routine blood cultures to improve health outcomes in the management of pyelonephritis in pregnant women. We searched the Cochrane Pregnancy and Childbirth Group's Trials Register without language or date restrictions (31 December 2014). Randomised controlled trials and quasi-randomised trials comparing outcomes among pregnant women with pyelonephritis who received initial management with or without blood cultures. Cluster-randomised trials were eligible for inclusion in this review but none were identified. Clinical trials using a cross-over design were not eligible for inclusion. Two review authors independently assessed one trial report for inclusion. We identified one trial report but this was excluded. No clinical trials met the inclusion criteria for this review. There are no large-scale randomised controlled trials to assess outcomes in the management of pyelonephritis in pregnancy with or without blood cultures. Randomised controlled trials are needed to evaluate the effectiveness of managing pyelonephritis in pregnant women with or without blood cultures, and to assess any adverse outcomes as well as the cost-effectiveness of excluding blood cultures from treatment.

Blood cultures in acute surgical admissions.

Obtaining blood cultures prior to the administration of antimicrobial therapy was a key recommendation of the 2012 UK Surviving Sepsis Campaign. Few studies have examined the effect blood cultures have on clinical management and there have been none on acute surgical admissions. This retrospective study sought to evaluate the effect of blood cultures on clinical management in acute surgical admissions. Data on acute surgical patients admitted between 1 January and 31 December 2012 were extracted from hospital records. Patients given intravenous antibiotics within 24 hours of admission were identified. Data collected included antibiotics administered, blood culture results, admission observations and white blood cell count. Case notes were reviewed for patients with positive cultures to establish whether the result led to a change in management. Of 5,887 acute surgical admissions, 1,346 received intravenous antibiotics within 24 hours and 978 sets of blood cultures were taken in 690 patients. The recommended two sets of cultures were obtained in 246 patients (18%). Patients who had blood cultures taken had the same in-hospital mortality as those who had none taken (3.6% vs 3.5%, p=0.97). Blood cultures were positive in 80 cases (11.6%). The presence of systemic inflammatory response syndrome did not increase positivity rates (12.9% vs 10.3%, p=0.28). Overall, cultures altered management in two patients (0.3%). Blood cultures rarely affect clinical management. In order to assess the additional value that blood cultures bring to sepsis management in acute surgical admissions, a prospective randomised trial focusing on outcome is needed.

Impact of appropriate antimicrobial therapy for patients with severe sepsis and septic shock--a quality improvement study.

BackgroundThere is ample literature available on the association between both time to antibiotics and appropriateness of antibiotics and clinical outcomes from sepsis. In fact, the current state of debate surrounds the balance to be struck between prompt empirical therapy and care in the choice of appropriate antibiotics (both in terms of the susceptibility of infecting organism and minimizing resistance arising from use of broad-spectrum agents). The objective of this study is to determine sepsis bundle compliance and the appropriateness of antimicrobial therapy in patients with severe sepsis and septic shock and its impact on outcomes.MaterialThis study was conducted in the ICU of a tertiary care, private hospital in São Paulo, Brazil. A retrospective cohort study was conducted from July 2005 to December 2012 in patients with severe sepsis and septic shock.ResultsA total of 1,279 patients were identified with severe sepsis and septic shock, of which 358 (32.1%) had bloodstream infection (BSI). The inpatient mortality rate was 29%. In evaluation of the sepsis bundle, over time there was a progressive increase in serum arterial lactate collection, obtaining blood cultures prior to antibiotic administration, administration of broad-spectrum antibiotics within 1 hour, and administration of appropriate antimicrobials, with statistically significant differences in the later years of the study. We also observed a significant decrease in mortality. In patients with bloodstream infection, after adjustment for other covariates the administration of appropriate antimicrobial therapy was associated with a decrease in mortality in patients with severe sepsis and septic shock (p = 0.023).ConclusionsThe administration of appropriate antimicrobial therapy was independently associated with a decline in mortality in patients with severe sepsis and septic shock due to bloodstream infection. As protocol adherence increased over time, the crude mortality rate decreased, which reinforces the need to implement institutional guidelines and monitor appropriate antimicrobial therapy compliance.

Readmission for infective endocarditis after ischemic stroke or transient ischemic attack.

Providers vary in their thresholds for obtaining blood cultures in patients with ischemic stroke or transient ischemic attack (TIA). We assessed the rate of missed diagnoses of infective endocarditis (IE) in patients discharged with stroke or TIA before blood culture results could have been available. Using administrative claims data, we performed a retrospective cohort study of all patients discharged from nonfederal California emergency departments or acute care hospitals from 2005 through 2011 with stroke (International Classification of Diseases, Ninth Revision, Clinical Modification [ICD-9-CM] codes 433.x1, 434.x1, or 436 in any position) or TIA (ICD-9-CM code 435 in the primary diagnosis position). We excluded patients with a length of stay >2 days to focus on those discharged before conclusive blood culture results could have been available. Our outcome was hospitalization within 14 days with a new diagnosis of IE (ICD-9-CM codes 391.1 or 421.x in any position). Among 173 966 eligible patients, 24 were subsequently hospitalized for IE-a readmission rate of 1.4 per 10 000 (95% confidence interval [CI], 0.8-1.9 per 10 000). Multiple logistic regression identified the following potential associations with readmission: prosthetic valve: odds ratio (OR), 15.8 (95% CI, 1.9-129.0); other valvular disease: OR, 1.5 (95% CI, 0.2-10.8); urinary tract infection: OR, 3.5 (95% CI, 1.0-12.3; P = .05). In patients with acute cerebral ischemia discharged before blood culture results could have been available, the rate of subsequent IE was negligible. These findings argue against the liberal use of blood cultures for the routine evaluation of stroke or TIA.

Harlequin ichthyosis: The third babies with harlequin ichthyosis in a family

Harlequin ichthyosis: The third babies with harlequin ichthyosis in a family

Fever in Children With Sickle Cell Disease: Are All Fevers Equal?

BackgroundSepsis is the most common cause of mortality in sickle cell disease (SCD). Empiric antibiotic administration after obtaining blood cultures in febrile children with SCD has been a standard practice parameter. ObjectiveOur primary objective was to calculate the rate of bacteremia in febrile pediatric patients with SCD. Our secondary objective was to establish whether vital signs or diagnostics predict bacteremia in these patients. MethodsWe conducted a retrospective chart review of patients with SCD who presented to an urban pediatric emergency department in Newark, NJ between January 1, 2001 and June 30, 2011 with the chief complaint of fever. Patients between the ages of 0 and 20 years with SCD who presented with the chief complaint of fever and who had a blood culture performed were included. Descriptive data, visit-specific data, and diagnostic data were collected. ResultsCharts of 307 patients were included. Six patients had a positive blood culture, one of which was considered a true pathogen (Streptococcus pneumoniae) (0.33%; 95% confidence interval 0.06%–1.86%). There was no statistical significance between the means of visit-specific and diagnostic data of patients with positive blood cultures and those with negative blood cultures. ConclusionsThe incidence of bacteremia in febrile children with SCD presenting to the emergency department is low. Close follow-up within 24 hours and delayed antibiotic administration can be a plausible alternative treatment option in this population.

Effective Biomarkers for Diagnosis of Neonatal Sepsis.

Infection in neonates continues to be a global problem with significant morbidity and mortality. The diagnosis of neonatal sepsis is complicated by nonspecific clinical symptomatology, a high-false negative rate, and a delay in obtaining blood culture results. An ideal biomarker needs to have a high degree of accuracy in recognizing the presence or absence of definite infection at an early stage, to guide the initiation and duration of antibiotic therapy. The diagnostic utility of the following biomarkers seems to be most practical in the early (interleukin [IL]-6, IL-8, tumor necrosis factor-alpha, neutrophil CD64), mid (procalcitonin) and late (C-reactive protein) phases of neonatal sepsis. Future research studies to assess reliability of these biomarkers should be (1) adequately powered for sample size and (2) use the gold-standard definition of blood-culture proven pathogen-specific sepsis. Significant advances in diagnostic accuracy of novel biomarkers to allow early, accurate, and cost-effective identification of pathogens responsible for neonatal sepsis is anticipated in the next 5 years.

Influence of Vegetation Size on the Clinical Presentation and Outcome of Lead-Associated Endocarditis: Results From the MEDIC Registry

The purpose of this study was to determine whether the clinical presentation of lead-associated endocarditis (LAE) is related to the size of lead vegetations and how size is related to bacteriology and clinical outcomes. Cardiac implantable electronic device (CIED) infection may present as either local pocket infection or bloodstream infection with or without LAE. LAE is associated with significant morbidity and mortality. The clinical presentation and course of LAE were evaluated by the MEDIC (Multicenter Electrophysiologic Device Cohort) registry, an international registry enrolling patients with CIED infection. Consecutive LAE patients enrolled in the MEDIC registry between January 1, 2009 and December 31, 2012 were analyzed. The clinical features and outcomes of 2 groups of patients were compared based on the size of the lead vegetation detected by echocardiography (> or <1 cm in diameter). There were 129 patients with LAE enrolled into the MEDIC registry. Of these, 61 patients had a vegetation <1 cm in diameter (Group I) whereas 68 patients had a vegetation ≥1 cm in diameter (Group II). Patients in Group I more often presented with signs of local pocket infection, whereas Group II patients presented with clinical evidence of systemic infection. Staphylococcus aureus was the organism most often responsible for LAE, whereas infection with coagulase-negative staphylococci was associated with larger vegetations. Outcomes were improved among those who underwent complete device removal. However, major complications were associated with an open surgical approach for device removal. The clinical presentation of LAE is influenced by the size of the lead vegetation. Prompt recognition and management of LAE depends on obtaining blood cultures and echocardiography, including transesophageal echocardiography, in CIED patients who present with either signs of local pocket or systemic infection.

Blood Culture Use in the Emergency Department in Patients Hospitalized for Community-Acquired Pneumonia

To the Editor: Routine blood cultures for all patients hospitalized with community-acquired pneumonia have limited utility, and false-positive results lead to inappropriate antimicrobial use and longer hospital stays.1 As a result, performance measures and practice guidelines that promoted obtaining blood cultures in all such patients were modified in 2005–2007 to recommend routine collection in only the sickest patients.1, 2 Using a national sample of emergency department (ED) visits, we examined patterns of obtaining cultures in adults hospitalized with community-acquired pneumonia.

Blood culture use in the emergency department in patients hospitalized with respiratory symptoms due to a nonpneumonia illness.

Guidelines and performance measures recommend obtaining blood cultures in selected patients hospitalized with community-acquired pneumonia (CAP). Due to inherent diagnostic uncertainty, there may be spillover effects of these recommendations on other conditions that resemble pneumonia. Using data from the 2002 to 2010 National Hospital Ambulatory Medical Care Survey, a nationally representative sample of emergency department (ED) visits in the United States, we analyzed trends in obtaining cultures in patients hospitalized with respiratory symptoms due to a nonpneumonia illness using linear regression. The most common primary admission diagnoses for these visits included heart failure (16%), chronic obstructive pulmonary disease (13%), and chest pain (12%). The proportion of cultures collected in the ED during these visits increased from 10% (95% confidence interval [CI]: 7%-14%) in 2002 to 20% (95% CI: 16%-26%) in 2010 (P<0.001 for the trend). This represented a parallel increase compared to patients hospitalized with CAP (P=0.12 for the difference in trends). The increase in collecting cultures in the ED in patients hospitalized with respiratory symptoms due to a nonpneumonia illness suggests an important potential unintended consequence of blood culture recommendations for CAP. More attention to the judicious use of blood cultures to reduce harm and costs is needed.

Abstract T P176: Readmission for Infective Endocarditis after Ischemic Stroke or Transient Ischemic Attack

Background: Guidelines recommend blood cultures for the evaluation of cerebral ischemia when infective endocarditis (IE) is the suspected cause, but given the absence of more specific guidance, providers likely have significantly varying thresholds for obtaining blood cultures in patients with cerebral ischemia. To explore the utility of blood cultures in these patients, we assessed rates of missed diagnoses of IE in patients discharged after stroke or TIA before blood culture results could have been available. Methods: Using administrative claims data, we retrospectively identified consecutive patients discharged from all nonfederal emergency departments (ED) or hospitals in California from 2005 through 2011 with a diagnosis of ischemic stroke (defined as ICD-9-CM codes 433.x1, 434.x1, or 436 in any diagnosis code position) or TIA (ICD-9-CM code 435 in the primary diagnosis position). Our primary outcome was a subsequent hospitalization within 14 days with any diagnosis of IE (ICD-9-CM code 391.1 or 421.x in any position). Patients with a diagnosis of IE before or at the time of their first stroke or TIA were excluded. To target patients discharged without conclusive blood culture results, only patients discharged directly from the ED or within 2 days of admission were included. A subgroup analysis was performed in patients diagnosed with TIA and discharged home from the ED. Results: Among 172,666 patients discharged with stroke or TIA, 24 were subsequently hospitalized for IE, equating to a readmission rate of 1.4 per 10,000 (95% CI, 0.8-2.0 per 10,000). Subgroup analysis of 39,019 patients diagnosed with TIA and discharged home from the ED revealed a readmission rate of 0.8 per 10,000 (95% CI, 0.1-1.6 per 10,000). Multiple logistic regression identified valvular disease (OR, 7.0; 95% CI, 2.9-17.2), chronic kidney disease (OR, 3.7; 95% CI, 1.3-10.4), and possibly drug abuse (OR, 5.0; 95% CI, 0.7-38.3) as risk factors for readmission with IE after discharge for stroke or TIA. Conclusions: In a cohort of patients with acute cerebral ischemia discharged before blood culture results could have been available, the rate of subsequent IE was negligible. These findings argue against the liberal use of blood cultures in the routine evaluation of ischemic stroke or TIA.

Appropriateness of Testing for Serious Bacterial Infection in Children Hospitalized With Bronchiolitis

The goal of this study was to evaluate provider practice patterns for evaluation of serious bacterial infection (SBI) in patients hospitalized with bronchiolitis and to assess the association of SBI testing with length of stay and antibiotic use. This was a retrospective chart review of hospitalized patients <24 months of age with a discharge diagnosis of bronchiolitis from 2 separate study sites during 2004 to 2008. Patient characteristics, laboratory testing, antibiotic use, and clinical outcomes were assessed in relation to SBI testing. A total of 1233 charts met inclusion criteria. The incidence of urinary tract infections in patients who underwent urine testing was 2.3%. Of the 367 patients undergoing blood culture testing, all 13 positive-result blood cultures were contaminated specimens. There were no cases of meningitis. In total, 64.5% of patients tested for SBI had a blood culture obtained, 45.0% had an urinalysis or urine culture, and 16.3% had a cerebral spinal fluid culture obtained. Of those patients who underwent SBI testing, 53.8% received antibiotics versus 19.1% who did not (P < .0001). Length of stay for patients undergoing SBI testing was 3.4 days versus 2.3 days for those without SBI testing (P < .0001). There was no significant difference in readmission rates. SBI is uncommon in children hospitalized for bronchiolitis, and urinary tract infection is the most common diagnosis. In the evaluation of SBI in bronchiolitis, providers more frequently obtain blood cultures than urinalysis and/or urine cultures. Evaluation for SBI is associated with increased antibiotic use and increased LOS.

Ventilator-associated pneumonia in the neonatal intensive care unit

Objective Ventilator-associated pneumonia (VAP) is defined as nosocomial pneumonia in mechanically ventilated patients. It is considered to be most important cause of infection-related death in the ICU. We studied the characteristics and risk factors of VAP in critically ill neonates. Background VAP, which was not present at the time of intubation, accounted for up to 30% of nosocomial infections in neonatal intensive care unit (NICU) patients. Patients and methods This study was carried out in the NICU in Benha Children's Hospital on 85 neonates with different diagnoses admitted from April to October 2012 who needed mechanical ventilation. All studied neonates were subjected to history taking, clinical examination, routine investigations (assessment of complete blood count, C-reactive protein levels, and arterial blood gas volumes, blood culture, and liver, serum albumin, and kidney function tests), and chest radiography daily, as well as to nonbronchoscopic alveolar lavage culture. Results Of 85 neonates who needed mechanical ventilation, 55.2% developed VAP. Prematurity, low birth weight, and prolonged duration of mechanical ventilation were risk factors for developing VAP. Increased total leukocyte count, C-reactive protein, and hypoalbuminemia were significantly present in the VAP group. There were significant differences between VAP and non-VAP groups regarding hypothermia, mucopurulent endotracheal tube secretion, PaCO 2 , and PaO 2 . The microorganisms associated with bloodstream infection in the VAP-diagnosed group were Staphylococcus aureus (15%), Klebsiella spp.(8.5%), Candida spp.(6.5%), Pseudomonas spp. (4.2%), and Escherichia coli (4.2%); 61.7% of obtained blood cultures in VAP patients were sterile. The results of nonbronchoscopic bronchoalveolar lavage cultures revealed the presence of Klebsiella spp. (34%), Pseudomonas spp. (25.5%), S. aureus (17%), E. coli (17%), and Candida spp. (6.4%). K. pneumoniae was the most commonly isolated pathogen in nonbronchoscopic bronchoalveolar lavage. Conclusion The most important risk factors of VAP are prematurity, low birth weight, prolonged duration of mechanical ventilation, enteral nutrition, and umbilical catheterization.

Obtaining Blood Cultures by Venipuncture versus from Central Lines Impact on Blood Culture Contamination Rates and Potential Effect on Central Line–Associated Bloodstream Infection Reporting

Reduce the frequency of contaminated blood cultures that meet National Healthcare Safety Network definitions for a central line-associated bloodstream infection (CLABSI). An observational study. A 500-bed university-affiliated hospital. A new blood culture policy discouraged drawing blood samples from central lines. Phlebotomists were reeducated regarding aseptic technique when obtaining blood samples by venipuncture. The intravenous therapy team was taught how to draw blood samples by venipuncture and served as a backup when phlebotomists were unable to obtain blood samples. A 2-nurse protocol and a special supply kit for obtaining blood samples from catheters were developed. Rates of blood culture contamination were monitored by the microbiology laboratory. The proportion of blood samples obtained for culture from central lines decreased from 10.9% during January-June 2010 to 0.4% during July-December 2012 (P < .001). The proportion of blood cultures that were contaminated decreased from 84 (1.6%) of 5,274 during January-June 2010 to 21 (0.5%) of 4,245 during January-June 2012 (P < .001). Based on estimated excess hospital costs of $3,000 per contaminated blood culture, the reduction in blood culture contaminants yielded an estimated annualized savings of $378,000 in 2012 when compared to 2010. In mid-2010, 3 (30%) of 10 reported CLABSIs were suspected to represent blood culture contamination compared with none of 6 CLABSIs reported from mid-November 2010 through June 2012 (P = 0.25). Multiple interventions resulted in a reduction in blood culture contamination rates and substantial cost savings to the hospital, and they may have reduced the number of reportable CLABSIs.

Taking blood cultures from a newly established intravenous catheter in the emergency department does not increase the rate of contaminated blood cultures

It has been suggested that blood cultures drawn from vascular catheters have a higher false positive rate than those drawn by venepuncture. In the face of institutionally imposed practice change prohibiting obtaining blood cultures from intravenous (i.v.) catheters in the ED, our aim of was to compare the rate of contaminated blood cultures between those taken from recently placed i.v. catheters and those taken by direct venepuncture. Prospective, non-randomised, observational study comparing the rate of contaminated blood cultures for specimens taken from recently placed (<1 h) i.v. catheters and direct venepuncture in adult ED patients. Outcome of interest was the rate of false positive cultures. Analysis was by comparison of proportions (χ(2) -test). Four hundred seventy-two blood culture sets were studied. There were 65 positive cultures, of which 49 (75%; 95% confidence interval [CI], 63-85%) were classified as true positive. The overall rate of contaminated blood cultures was 3.4% (95% CI, 2.0-5.6%). There was no difference in false positive rate between blood cultures taken via venepuncture and those taken from a recently placed i.v. cannula (P = 0.52; odds ratio, 0.9; 95% CI, 0.33-2.44). We found no difference in contaminated blood culture rate between recently placed i.v. catheters and direct venepuncture when infection control procedures were followed.

12 ways to take a temperature

12 ways to take a temperature

Differential time to positivity is not predictive for central line-related Staphylococcus aureus bloodstream infection in routine clinical care

Many physicians rely on differential time to positivity (DTP) when diagnosing catheter-related bloodstream infection (CRBSI). We evaluated whether DTP from routine blood cultures can predict catheter-related Staphylococcus aureus bloodstream infection. From 2006 to 2011 adult patients with monomicrobial S. aureus bloodstream infection and matched pairs of central and peripheral blood cultures were prospectively followed. CRBSI was defined by the absence of other infective foci and recovery of S. aureus from the catheter tip or catheter exit-site, or local signs of infection at the catheter exit site. A DTP of more than two hours (cut-off) was used to define test positivity. CRBSI was present in 30 (34%, prevalence) of 87 patients. In 24 (28%) patients a DTP of more than two hours was measured: eleven patients had CRBSI, ten deep-seated infections, and in three patients an infective focus was not identified. DTP showed a positive predictive value of 0.46 [95% confidence interval (CI) 0.28 to 0.65], and a negative predictive value of 0.70 [95% CI 0.58 to 0.80]. The low test performance suggests that DTP is not useful in diagnosing CRBSI in routinely obtained blood cultures. Therefore, physicians should not solely rely on DTP and rather promote catheter removal and culture.

Mycobacterium tuberculosis Bacteremia in a Cohort of HIV-Infected Patients Hospitalized with Severe Sepsis in Uganda–High Frequency, Low Clinical Sand Derivation of a Clinical Prediction Score

BackgroundWhen manifested as Mycobacterium tuberculosis (MTB) bacteremia, disseminated MTB infection clinically mimics other serious blood stream infections often hindering early diagnosis and initiation of potentially life-saving anti-tuberculosis therapy. In a cohort of hospitalized HIV-infected Ugandan patients with severe sepsis, we report the frequency, management and outcomes of patients with MTB bacteremia and propose a risk score based on clinical predictors of MTB bacteremia.MethodsWe prospectively enrolled adult patients with severe sepsis at two Ugandan hospitals and obtained blood cultures for MTB identification. Multivariable logistic regression modeling was used to determine predictors of MTB bacteremia and to inform the stratification of patients into MTB bacteremia risk categories based on relevant patient characteristics.ResultsAmong 368 HIV-infected patients with a syndrome of severe sepsis, eighty-six (23%) had MTB bacteremia. Patients with MTB bacteremia had a significantly lower median CD4 count (17 vs 64 lymphocytes/mm3, p<0.001) and a higher 30-day mortality (53% vs 32%, p = 0.001) than patients without MTB bacteremia. A minority of patients with MTB bacteremia underwent standard MTB diagnostic testing (24%) or received empiric anti-tuberculosis therapy (15%). Independent factors associated with MTB bacteremia included male sex, increased heart rate, low CD4 count, absence of highly active anti-retroviral therapy, chief complaint of fever, low serum sodium and low hemoglobin. A risk score derived from a model containing these independent predictors had good predictive accuracy [area under the curve = 0.85, 95% CI 0.80–0.89].ConclusionsNearly 1 in 4 adult HIV-infected patients hospitalized with severe sepsis in 2 Ugandan hospitals had MTB bacteremia. Among patients in whom MTB was suspected, standard tests for diagnosing pulmonary MTB were inaccurate for correctly classifying patients with or without bloodstream MTB infection. A MTB bacteremia risk score can improve early diagnosis of MTB bacteremia particularly in settings with increased HIV and MTB co-infection.