Ari A. Robicsek, M.D.

Ari A. Robicsek, M.D.

Ari A. Robicsek, M.D.

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Conditions & Procedures


Bone and Joint Infection, Fever of Unknown Origin, Illness in Returning Travelers, Infection Associated with Healthcare Contact, Infection in Patients over 18 Years of Age, Infections Associated with Implanted Devices, New Diagnosis HIV or Ongoing Care, Skin and Soft Tissue Infection


Appropriate Utilization of Antimicrobials, Diagnosis and Treatment of Infections during Immunosuppression, Medical Informatics, Prevention of Infection, Surveillance and Prevention of Infection in Healthcare

General Information




NorthShore Medical Group


Infectious Diseases

Academic Rank

Clinical Associate Professor



Board Certified

Infectious Disease, Internal Medicine

Clinical Service

Infectious Diseases

Education, Training & Fellowships

Medical School

University of Toronto Medical School, 1998


Mount Sinai Hospital - Canada, 1999


Toronto General Hospital, 2001


Toronto General Hospital, 2002
Harvard Medical School - Massachusetts General Hospital, 2005



NorthShore Medical Group

2650 Ridge Ave.
Evanston, IL 60201
847.657.5959 847.657.5764 fax This location is wheelchair accessible.


Every effort has been made to ensure the accuracy of the information in this directory. However, some changes may occur between updates. Please check with your provider to ensure that he or she participates in your health plan.

BCBS PPO *except Blue Choice IL
Beechstreet PPO
CIGNA Choice Fund
CIGNA Choice Fund PPO
CIGNA Network
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CIGNA:Open Access Plus
Community Care Partners
First Health PPO
Galaxy PPO
Great West POS
Great West PPO
Healthcares Finest Network PPO
Humana Choice Care PPO
Humana IPA--HMO
Humana POS
Humana PPO
Land of Lincoln
Multiplan Admar PPO
Multiplan Formost PPO
Multiplan Health Network PPO
Multiplan Wellmark PPO
NorthShore Employee Network I (EPO Option)
NorthShore Employee Network II (EPO Plus & CDHP)
Preferred Plan PPO
Railroad Medicare - Cook County
UHC *except Core & Navigate
Unicare PPO


  • Multidrug-resistant organisms contaminating supply carts of contact isolation patients.

    American journal of infection control 2014 Oct

    Authors: Zelencik S,
    Contamination of supply carts stored within rooms of patients on contact isolation for multidrug-resistant organisms was assessed. Despite the presence of environmentally persistent organisms, very little contamination occurred to these carts or the supplies stored within them. A single isolate containing a multidrug-resistant Acinetobacter baumannii was isolated, representing 1.3% of the 80 swabs collected.
    PMID: 25278409 [PubMed - as supplied by publisher]
  • Sensitivity of surveillance testing for multidrug-resistant gram-negative bacteria in the intensive care unit.

    Journal of clinical microbiology 2014 Nov

    Authors: Ridgway JP,
    We tested intensive care unit patients for colonization with multidrug-resistant Gram-negative bacilli (MDR GNB) and compared the results with those of concurrent clinical cultures. The sensitivity of the surveillance test for detecting MDR GNB was 58.8% (95% confidence interval, 48.6 to 68.5%). Among 133 patients with positive surveillance tests, 61% had no prior clinical culture with MDR GNB.
    PMID: 25143577 [PubMed - as supplied by publisher]
  • Multicenter development and validation of a risk stratification tool for ward patients.

    American journal of respiratory and critical care medicine 2014 Sep 15

    Authors: Churpek MM,
    Most ward risk scores were created using subjective opinion in individual hospitals and only use vital signs.
    To develop and validate a risk score using commonly collected electronic health record data.
    All patients hospitalized on the wards in five hospitals were included in this observational cohort study. Discrete-time survival analysis was used to predict the combined outcome of cardiac arrest (CA), intensive care unit (ICU) transfer, or death on the wards. Laboratory results, vital signs, and demographics were used as predictor variables. The model was developed in the first 60% of the data at each hospital and then validated in the remaining 40%. The final model was compared with the Modified Early Warning Score (MEWS) using the area under the receiver operating characteristic curve and the net reclassification index (NRI).
    A total of 269,999 patient admissions were included, with 424 CAs, 13,188 ICU transfers, and 2,840 deaths occurring during the study period. The derived model was more accurate than the MEWS in the validation dataset for all outcomes (area under the receiver operating characteristic curve, 0.83 vs. 0.71 for CA; 0.75 vs. 0.68 for ICU transfer; 0.93 vs. 0.88 for death; and 0.77 vs. 0.70 for the combined outcome; P value < 0.01 for all comparisons). This accuracy improvement was seen across all hospitals. The NRI for the electronic Cardiac Arrest Risk Triage compared with the MEWS was 0.28 (0.18-0.38), with a positive NRI of 0.19 (0.09-0.29) and a negative NRI of 0.09 (0.09-0.09).
    We developed an accurate ward risk stratification tool using commonly collected electronic health record variables in a large multicenter dataset. Further study is needed to determine whether implementation in real-time would improve patient outcomes.
    PMID: 25089847 [PubMed - as supplied by publisher]
  • Predictive utility of prior positive urine cultures.

    Clinical infectious diseases : an official publication of the Infectious Diseases Society of America 2014 Nov 1

    Authors: MacFadden DR,
    A patient's prior urine cultures are often considered when choosing empiric antibiotic therapy for a suspected urinary tract infection. We sought to evaluate how well previous urine cultures predict the identity and susceptibility of organisms in a patient's subsequent urine cultures.
    We conducted a multinational, multicenter, retrospective cohort study, including 22 019 pairs of positive urine cultures from 4351 patients across 2 healthcare systems in Toronto, Ontario, and Chicago, Illinois. We examined the probability of the same organism being identified from the same patient's positive urine culture as a function of time elapsed from the previous positive urine specimen; in cases where the same organism was identified we also examined the likelihood of the organism exhibiting the same or better antimicrobial susceptibility profile.
    At 4-8 weeks between cultures, the correspondence in isolate identity was 57% (95% confidence interval [CI], 55%-59%), and at >32 weeks it was 49% (95% CI, 48%-50%), still greater than expected by chance (P < .001). The susceptibility profile was the same or better in 83% (95% CI, 81%-85%) of isolate pairs at 4-8 weeks, and 75% (95% CI, 73%-77%) at >32 weeks, still greater than expected by chance (P < .001). Despite high local rates of ciprofloxacin resistance in urine isolates across all patients (40%; 95% CI, 39.5%-40.5%), ciprofloxacin resistance was <20% among patients with a prior ciprofloxacin sensitive organism and no subsequent fluoroquinolone exposure.
    A patient's prior urine culture results are useful in predicting the identity and susceptibility of a current positive urine culture. In areas of high fluoroquinolone resistance, ciprofloxacin can be used empirically when prior urine culture results indicate a ciprofloxacin-susceptible organism and there has been no history of intervening fluoroquinolone use.
    PMID: 25048850 [PubMed - as supplied by publisher]
  • A technology-based quality innovation to identify undiagnosed hypertension among active primary care patients.

    Annals of family medicine 2014 Jul

    Authors: Rakotz MK,
    The goal of this study was to develop a technology-based strategy to identify patients with undiagnosed hypertension in 23 primary care practices and integrate this innovation into a continuous quality improvement initiative in a large, integrated health system.
    In phase 1, we reviewed electronic health records (EHRs) using algorithms designed to identify patients at risk for undiagnosed hypertension. We then invited each at-risk patient to complete an automated office blood pressure (AOBP) protocol. In phase 2, we instituted a quality improvement process that included regular physician feedback and office-based computer alerts to evaluate at-risk patients not screened in phase 1. Study patients were observed for 24 additional months to determine rates of diagnostic resolution.
    Of the 1,432 patients targeted for inclusion in the study, 475 completed the AOBP protocol during the 6 months of phase 1. Of the 1,033 at-risk patients who remained active during phase 2, 740 (72%) were classified by the end of the follow-up period: 361 had hypertension diagnosed, 290 had either white-coat hypertension, prehypertension, or elevated blood pressure diagnosed, and 89 had normal blood pressure. By the end of the follow-up period, 293 patients (28%) had not been classified and remained at risk for undiagnosed hypertension.
    Our technology-based innovation identified a large number of patients at risk for undiagnosed hypertension and successfully classified the majority, including many with hypertension. This innovation has been implemented as an ongoing quality improvement initiative in our medical group and continues to improve the accuracy of diagnosis of hypertension among primary care patients.
    PMID: 25024244 [PubMed - as supplied by publisher]
  • Reply to Daniell.

    Infection control and hospital epidemiology : the official journal of the Society of Hospital Epidemiologists of America 2014 Jan

    Authors: Ridgway JP,
    Methicillin-resistant Staphylococcus aureus (MRSA) nasal colonization among inpatients is a well-established risk factor for MRSA infection during the same hospitalization, but the long-term risk of MRSA infection is uncertain. We performed a retrospective cohort study to determine the one-year risk of MRSA infection among inpatients with MRSA-positive nasal polymerase chain reaction (PCR) tests confirmed by positive nasal culture (Group 1), patients with positive nasal PCR but negative nasal culture (Group 2), and patients with negative nasal PCR (Group 3).
    Subjects were adults admitted to a four-hospital system between November 1, 2006 and March 31, 2011, comprising 195,255 admissions. Patients underwent nasal swab for MRSA PCR upon admission; if positive, nasal culture for MRSA was performed; if recovered, MRSA was tested for Panton-Valentine Leukocidin (PVL). Outcomes included MRSA-positive clinical culture and skin and soft tissue infection (SSTI). Group 1 patients had a one-year risk of MRSA-positive clinical culture of 8.0% compared with 3.0% for Group 2 patients, and 0.6% for Group 3 patients (p<0.001). In a multivariable model, the hazard ratios for future MRSA-positive clinical culture were 6.52 (95% CI, 5.57 to 7.64) for Group 1 and 3.40 (95% CI, 2.70 to 4.27) for Group 2, compared with Group 3 (p<0.0001). History of MRSA and concurrent MRSA-positive clinical culture were significant risk factors for future MRSA-positive clinical culture. Group 1 patients colonized with PVL-positive MRSA had a one-year risk of MRSA-positive clinical culture of 10.1%, and a one-year risk of MRSA-positive clinical culture or SSTI diagnosis of 21.7%, compared with risks of 7.1% and 12.5%, respectively, for patients colonized with PVL-negative MRSA (p = 0.04, p = 0.005, respectively).
    MRSA nasal colonization is a significant risk factor for future MRSA infection; more so if detected by culture than PCR. Colonization with PVL-positive MRSA is associated with greater risk than PVL-negative MRSA.
    PMID: 24334807 [PubMed - as supplied by publisher]
  • Molecular epidemiology of Escherichia coli sequence type 131 and Its H30 and H30-Rx subclones among extended-spectrum-β-lactamase-positive and -negative E. coli clinical isolates from the Chicago Region, 2007 to 2010.

    Antimicrobial agents and chemotherapy 2013 Dec

    Authors: Banerjee R,
    We assessed Escherichia coli ST131 and its H30 and H30-Rx subclones for virulence genes, antimicrobial resistance, and extended-spectrum beta-lactamase (ESBL) type. Although both subclones were associated with ESBL production, H30-Rx isolates had higher resistance scores and were associated specifically with CTX-M-15. Three virulence genes (iha, sat, and iutA) were more prevalent among H30 than non-H30 ST131 isolates. Thus, the H30 and H30-Rx subclones are more antimicrobial resistant and have virulence profiles that are distinct from those of non-H30 ST131 isolates.
    PMID: 24080662 [PubMed - as supplied by publisher]
  • Utility of prior screening for methicillin-resistant Staphylococcus aureus in predicting resistance of S. aureus infections.

    CMAJ : Canadian Medical Association journal = journal de l'Association medicale canadienne 2013 Oct 15

    Authors: MacFadden DR, Elligsen M, Robicsek A, Ricciuto DR, Daneman N,
    Screening for methicillin-resistant Staphylococcus aureus (MRSA) is intended to reduce nosocomial spread by identifying patients colonized by MRSA. Given the widespread use of this screening, we evaluated its potential clinical utility in predicting the resistance of clinical isolates of S. aureus.
    We conducted a 2-year retrospective cohort study that included patients with documented clinical infection with S. aureus and prior screening for MRSA. We determined test characteristics, including sensitivity and specificity, of screening for predicting the resistance of subsequent S. aureus isolates.
    Of 510 patients included in the study, 53 (10%) had positive results from MRSA screening, and 79 (15%) of infecting isolates were resistant to methicillin. Screening for MRSA predicted methicillin resistance of the infecting isolate with 99% (95% confidence interval [CI] 98%-100%) specificity and 63% (95% CI 52%-74%) sensitivity. When screening swabs were obtained within 48 hours before isolate collection, sensitivity increased to 91% (95% CI 71%-99%) and specificity was 100% (95% CI 97%-100%), yielding a negative likelihood ratio of 0.09 (95% CI 0.01-0.3) and a negative predictive value of 98% (95% CI 95%-100%). The time between swab and isolate collection was a significant predictor of concordance of methicillin resistance in swabs and isolates (odds ratio 6.6, 95% CI 1.6-28.2).
    A positive result from MRSA screening predicted methicillin resistance in a culture-positive clinical infection with S. aureus. Negative results on MRSA screening were most useful for excluding methicillin resistance of a subsequent infection with S. aureus when the screening swab was obtained within 48 hours before collection of the clinical isolate.
    PMID: 24016794 [PubMed - as supplied by publisher]
  • Predictors and molecular epidemiology of community-onset extended-spectrum β-lactamase-producing Escherichia coli infection in a Midwestern community.

    Infection control and hospital epidemiology : the official journal of the Society of Hospital Epidemiologists of America 2013 Sep

    Authors: Banerjee R,
    To identify predictors of community-onset extended-spectrum β-lactamase (ESBL)-producing Escherichia coli infection.
    Prospective case-control study.
    Acute care hospitals and ambulatory clinics in the Chicago, Illinois, region.
    Adults with E. coli clinical isolates cultured in ambulatory settings or within 48 hours of hospital admission.
    Cases were patients with ESBL-producing E. coli clinical isolates cultured in ambulatory settings or within 48 hours of admission, and controls were patients with non-ESBL-producing E. coli isolates, matched to cases by specimen, location, and date. Clinical variables were ascertained through interviews and medical record review. Molecular methods were used to identify ESBL types, sequence type ST131, and aac(6')-Ib-cr.
    We enrolled 94 cases and 158 controls. Multivariate risk factors for ESBL-producing E. coli infection included travel to India in the past year (odds ratio [OR], 14.40 [95% confidence interval (CI), 2.92-70.95]), ciprofloxacin use (OR, 3.92 [95% CI, 1.90-8.1]), and age (OR, 1.04 [95% CI, 1.02-1.06]). Case isolates exhibited high prevalence of CTX-M-15 (78%), ST131 (50%), and aac(6')-Ib-cr (66% of isolates with CTX-M-15).
    Providers should be aware of the increased risk of ESBL-producing E. coli infection among returned travelers, especially those from India.
    PMID: 23917909 [PubMed - as supplied by publisher]

In the News

Jan 2014

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Novel H1N1: Dr. Ari Robicsek (Infectious Diseases)

Novel H1N1: Dr. Ari Robicsek (Infectious Diseases)

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