[Original strategy for prevention of recurrent symptomatic urinary tract infections in patients with neurogenic bladder: Bacterial interference, state of the art]. / Stratégie préventive originale des infections urinaires symptomatiques chez les patients porteurs d'une vessie neurologique : l'interférence bactérienne, état de l'art.

PURPOSE: Urinary tract infection (UTI) is the most common complication in patients with neurogenic bladder. The long-term use of antibiotic drugs induces an increase in antimicrobial resistance and adverse drug reactions. Bacterial interference is a new concept to prevent recurrent UTI which consists in a bladder colonization with low virulence bacteria. We performed a literature review on this emerging therapy. MATERIALS AND METHODS: Literature review of bacterial interference to prevent symptomatic urinary tract infection in neurological population. RESULTS: Seven prospectives study including 3 randomized, double-blind and placebo controlled trial were analyzed. The neurological population was spinal cord injured in most cases. The bladder colonization was performed with 2 non-pathogen strains of Escherichia coli: HU 2117 and 83972. At 1 month, 38 to 83% of patients were colonized. Mean duration of colonization was 48.5 days to 12.3 months. All studies showed that colonization might reduce the number of urinary tract infections and is safe with absence of serious side effects. CONCLUSION: Bacterial interference is a promising alternative therapy for the prevention of recurrent symptomatic urinary tract infections in neurogenic patients. This therapy should have developments for a daily use practice and for a long-term efficacy.

Diagnostic delay of pyogenic vertebral osteomyelitis and its associated factors.

OBJECTIVES: Pyogenic vertebral osteomyelitis (PVO) is a rare disease with possible severe complications (e.g. sepsis and spinal cord injury). In the 1990s, diagnostic delay (DD) was often extensive as PVO has a non-specific clinical spectrum, mostly afebrile with back pain, and access to magnetic resonance imaging (MRI) was not straightforward. Our aim was to perform a new study focusing on the clinical spectrum and DD of PVO and its associated factors. METHOD: This study examined a prospective cohort of 88 patients having PVO with microbiological identification between 15 November 2006 and 15 November 2010. RESULTS: The 88 patients included in the study (female:male ratio 1:8) had a mean age of 64.1 years. The mean (sd) DD was 45.5 (50.4) days (range 2-280), and 46 patients (52.2%) were febrile at diagnosis. The main microorganism involved was Staphylococcus (n = 45; 51.1%). In univariate and multivariate analyses, age > 75 years, antecedent back pain, involvement of bacteria, topography of PVO, and anti-inflammatory drug intake did not affect the DD, unlike a C-reactive protein (CRP) value > 63 mg/L or a positive blood culture (DD lowered from 73 to 17 days and from 90 to 30 days, respectively). Conversely, X-ray investigation was associated with a longer DD (from 14 to 34.7 days). Severity at diagnosis was not significantly different depending on the intake of anti-inflammatory drugs. CONCLUSIONS: Despite easier access to MRI, the DD for PVO remains long. One shortening factor is a high CRP value, which could be a useful diagnostic tool in case of back pain. Anti-inflammatory drugs seem to have no impact on DD and severity at diagnosis.

Is 5 days of oral fluoroquinolone enough for acute uncomplicated pyelonephritis? The DTP randomized trial.

The treatment duration of acute uncomplicated pyelonephritis (AUP) is still under debate. As shortening treatment duration could be a means to reduce antimicrobial resistance, we aimed to establish whether 5 days of antibiotic treatment is non-inferior to 10 days in patients with AUP. We performed an open-label prospective randomized trial comparing 5 days to 10 days of fluoroquinolone treatment for AUP. The inclusion criteria were: female patients aged ≥18 years with clinical signs of urinary tract infection, fever >38 °C, and positive urinalysis. Patients were randomized to either 5 or 10 days of fluoroquinolone treatment. Outcome was cure at day 10 and day 30 after the end of treatment. One hundred patients were randomized and 12 were excluded after randomization. The mean ± standard deviation (SD) age was 31.8 ± 11 years old and the mean ± SD temperature was 38.6 ± 0.7 °C. The main bacterium involved was Escherichia coli (n = 86; 97.7%) and 3 (3.4%) patients had a positive blood culture. In the post-hoc analysis, clinical cure 10 days after the end of the treatment was 28/30 (93.3%) in the 5-day arm and 36/38 (94.7%) in the 10-day arm (p = 1.00). At day 30, the clinical cure rate was 23/23 (100%) in the 5-day arm and 20/20 (100%) in the 10-day arm (p = 1.00). The microbiological cure rate was 20/23 (87.0%) in the 5-day arm and 16/20 (80.0%) in the 10-day arm (p = 1.00). The efficacy of 5 days of fluoroquinolone treatment does not seem different from 10 days of treatment for AUP.

Prolonged suppressive antibiotic therapy for prosthetic joint infection in the elderly: a national multicentre cohort study.

During prosthetic joint infection (PJI), optimal surgical management with exchange of the device is sometimes impossible, especially in the elderly population. Thus, prolonged suppressive antibiotic therapy (PSAT) is the only option to prevent acute sepsis, but little is known about this strategy. We aimed to describe the characteristics, outcome and tolerance of PSAT in elderly patients with PJI. We performed a national cross-sectional cohort study of patients >75 years old and treated with PSAT for PJI. We evaluated the occurrence of events, which were defined as: (i) local or systemic progression of the infection (failure), (ii) death and (iii) discontinuation or switch of PSAT. A total of 136 patients were included, with a median age of 83 years [interquartile range (IQR) 81-88]. The predominant pathogen involved was Staphylococcus (62.1%) (Staphylococcus aureus in 41.7%). A single antimicrobial drug was prescribed in 96 cases (70.6%). There were 46 (33.8%) patients with an event: 25 (18%) with an adverse drug reaction leading to definitive discontinuation or switch of PSAT, 8 (5.9%) with progression of sepsis and 13 died (9.6%). Among patients under follow-up, the survival rate without an event at 2 years was 61% [95% confidence interval (CI): 51;74]. In the multivariate Cox analysis, patients with higher World Health Organization (WHO) score had an increased risk of an event [hazard ratio (HR) = 1.5, p = 0.014], whereas patients treated with beta-lactams are associated with less risk of events occurring (HR = 0.5, p = 0.048). In our cohort, PSAT could be an effective and safe option for PJI in the elderly.

Outcome of bloodstream infections among spinal cord injury patients and impact of multidrug-resistant organisms.

STUDY DESIGN: Retrospective cohort study. OBJECTIVES: Our study aimed to describe the outcome of bloodstream infection (BSI) in spinal cord injury (SCI) patients and their associated risk factors for severity and mortality. SETTING: A French University Hospital. METHODS: We conducted a retrospective cohort study of all BSIs occurring in hospitalized SCI patients. We analyzed their outcome and risk factors especially the impact of multidrug-resistant organisms (MDROs). RESULTS: Overall, 318 BSIs occurring among 256 patients were included in the analysis. Mean age was 50.8 years and gender ratio (M/F) was 2.70, with a mean injury duration of 11.6 years.Severity and 30-day mortality of BSI episodes were, respectively, 43.4% and 7.9%. BSI severity was significantly more frequent when caused by respiratory tract infections (RTIs) (odds ratio (OR)=1.38; 95% confidence interval (CI): 1.13-1.44) and significantly lower when caused by urinary tract infections (UTIs) (OR=0.47; 95% CI: 0.28-0.76). BSI mortality was significantly higher when caused by RTIs (OR=3.08; 95% CI: 1.05-8.99), catheter-related bloodstream infections (OR=3.54; 95% CI: 1.36-9.18) or Pseudomonas aeruginosa infections (OR=3.79; 95% CI: 1.14-12.55).MDROs were responsible for 41.2% of all BSI. They have no impact on severity and mortality, whichever be the primary site of infection.In multivariate analysis, mortality was higher when BSI episodes were due to RTIs (OR=3.26; 95% CI: 1.29-8.22) and Pseudomonas aeruginosa infections (OR=3.53; 95% CI: 1.06-11.70), or when associated with immunosuppressive therapy (OR=2.57; 95% CI: 1.14-5.78) or initial severity signs (OR=1.68; 95% CI: 1.01-2.81). CONCLUSION: BSI occurring in SCI population were often severe but mortality remained low. MDROs were frequent but not associated with severity or mortality of BSI episodes. Risk factors associated with mortality were initial severe presentation, RTI, immunosuppressive therapy and BSI due to Pseudomonas aeruginosa.

Blood stream infections due to multidrug-resistant organisms among spinal cord-injured patients, epidemiology over 16 years and associated risks: a comparative study.

STUDY DESIGN: Retrospective study. OBJECTIVES: We aimed to describe the epidemiology of multidrug-resistant organisms (MDROs) during bloodstream infection (BSI) and identify associated risks of MDROs among patients with spinal cord injury (SCI). SETTING: A teaching hospital, expert center in disability, in France. METHODS: We studied a retrospective cohort of all BSIs occurring in SCI patients hospitalized over 16 years. We described the prevalence of MDRO BSI among this population and its evolution over time and compared the BSI population due to MDROs and due to non-MDROs. RESULTS: A total of 318 BSIs occurring among 256 patients were included in the analysis. The most frequent primary sites of infection were urinary tract infection (34.0%), pressure sore (25.2%) and catheter line-associated bloodstream infection (11.3%). MDROs were responsible for 41.8% of BSIs, and this prevalence was stable over 16 years. No significant associated factor for MDRO BSI could be identified concerning sociodemographic and clinical characteristics, primary site of infection and bacterial species in univariate and multivariate analyses. BSI involving MDROs was not associated with initial severity of sepsis compared with infection without MDROs (43.8 vs 43.6%, respectively) and was not associated either with 30th-day mortality (6.2 vs 9%, respectively). CONCLUSION: During BSI occurrence in an SCI population, MDROs are frequent but remain stable over years. No associated risk can be identified that would help optimize antibiotic treatment. Neither the severity of the episode nor the mortality is significantly different when an MDRO is involved.

Native bone and joint infections caused by extended-spectrum ß-lactamase-producing Enterobacterales: experience of a reference centre in the Greater Paris area.

Antibiotic treatment of native osteomyelitis caused by extended-spectrum ß-lactamase-producing Enterobacterales (ESBL-PE) is a challenge. Limited epidemiological and outcome data are available. This retrospective cohort study included osteomyelitis patients with ESBL-PE infections treated in a reference centre for bone and joint infections (BJIs) between 2011-2019. Twenty-nine patients with native BJI (mean age, 44.4 ± 15.7 years) were analysed. Fifteen cases were paraplegic patients with ischial pressure sores breaching the hip capsule. Other cases included eight other hip infections, four tibial infections and two foot infections. Infections were mostly polymicrobial (n = 23; 79.3%), including Staphylococcus aureus (n = 13; 8 methicillin-resistant). Klebsiella pneumoniae (n = 13) was the most frequent ESBL-producing species identified, followed by Escherichia coli (n = 10), including 3 E. coli/K. pneumoniae co-infections, and Enterobacter spp. (n = 9). ESBL-PE were rarely susceptible to fluoroquinolones (n = 4; 13.8%). Most therapies were based on carbapenems (n = 22) and combination therapies (n = 19). The median duration of treatment was 41 (5-60) days. Primary control of the infection was achieved in 62.1% (18/29) of cases and up to 86.2% after second look surgeries, after a median follow-up of 6 (1-36) months. Infection with ESBL-producing K. pneumoniae was associated with failure (P = 0.001), whereas age, infection location, prior colonisation and antimicrobial therapy were not found to be predictors of outcome. ESBL-PE native BJIs are often polymicrobial and fluoroquinolone-resistant infections caused by K. pneumoniae, highlighting the need for expert centres with pluridisciplinary meetings with experienced surgeons.

Case series of carbapenemase-producing Enterobacteriaceae osteomyelitis: Feel it in your bones.

OBJECTIVES: Limited data have been reported regarding osteomyelitis due to carbapenemase-producing Enterobacteriaceae (CPE), including co-infections with extended-spectrum ß-lactamase (ESBL)-producing micro-organisms. METHODS: We conducted a retrospective study in a reference centre for bone and joint infections from 2011 to 2019 among patients infected with CPE. RESULTS: Nine patients (mean age 46.8 ± 16.6 years), including three with infected implants, were identified. Infections were mostly polymicrobial (n = 8/9), including Staphylococcus aureus (n = 6/9). CPE were mainly OXA-48-type, associated with ESBL-producing Enterobacteriaceae (n = 8/9), of which 5/9 isolates were Klebsiella pneumoniae. Control of the infection was achieved in seven cases. CONCLUSIONS: CPE osteomyelitides are essentially polymicrobial and fluoroquinolone-resistant infections, highlighting the need for efficient surgery with implant removal.

Urinary tract infections in patients with neurogenic bladder.

Urinary tract infections (UTIs) in patients with neurogenic bladder are a major public health issue due to their high incidence and major consequences. Despite their frequency and potential severity, their physiopathology and management are poorly known. We provide a narrative literature review on the epidemiology, physiopathology, diagnostic criteria, microbiology, antimicrobial management, and prevention. UTIs among patients with neurogenic bladder are associated with high morbidity and healthcare utilization. Risk factors for UTI among this population are: indwelling catheter, urinary stasis, high bladder pressure, and bladder stones. Their diagnosis is a major challenge as clinical signs are often non-specific and rare. A urinary sample should be analyzed in appropriate conditions before any antibiotic prescription. According to most guidelines, a bacterial threshold≥103CFU/ml associated with symptoms is acceptable to define UTI in patients with neurogenic bladder. The management of acute symptomatic UTI is not evidence-based. A management with a single agent and a short antibiotic treatment of 10 days or less seems effective. Antibiotic selection should be based on the patient's resistance patterns. Asymptomatic bacteriuria should not be treated to avoid the emergence of bacterial resistance. Regarding preventive measures, use of clean intermittent catheterization, intravesical botulinum toxin injection, and prevention using antibiotic cycling are effective. Bacterial interference is promising but randomized controlled trials are needed. Large ongoing cohorts and randomized controlled trials should soon provide more evidence-based data.

Management of established pressure ulcer infections in spinal cord injury patients.

OBJECTIVES: Pressure ulcers are frequently observed in spinal cord injury (SCI) patients. They can be life-threatening and are a major medico-economic burden. Despite their frequency, their pathophysiology and optimal management are still poorly understood. Most available data comes from non-comparative studies, especially in terms of antimicrobial use. METHODS: We performed a critical review of the literature and opinions of infectious disease specialists based in a French expert center for this disease. We mainly focused on antimicrobial treatments prescribed in this situation. RESULTS: These infections are usually clinically diagnosed. Microbiological samples are not the gold standard for this assessment. Furthermore, reliable microbiological identification is a major challenge but should help select antimicrobial treatment. Imaging technique could be helpful but cannot replace the physical examination. The choice of antimicrobials must consider the potential ecological collateral damages in this vulnerable population. Antimicrobial therapy should be as short as possible, adapted to the microbiological identification, and must have suitable bioavailability. CONCLUSION: Management of infected pressure ulcers is a major concern in disabled patients already highly exposed to antimicrobial treatment and multidrug-resistant organisms colonization. Extensive data is required.

[Clinical presentation and performance of urine dipstick for diagnosis of urinary infection in geriatric population]. / Présentation clinique et performance de la bandelette urinaire pour le diagnostic d'infection urinaire en population gériatrique.

BACKGROUND: Urinary tract infections (UTI) are the second cause of community-acquired bacterial infections in the elderly. Distinguishing symptomatic UTI from asymptomatic bacteriuria is problematic, as older adults are less likely to present with localized urinary symptoms. We evaluated characteristics of patients presenting UTI among elderly with sepsis. Moreover, we aimed to evaluate the sensibility and specificity of urine dipstick tests in the diagnosis of UTI in geriatric population. PATIENTS AND METHOD: We led a prospective, monocentric, observational study between April 2017 and January 2018. We included patients hospitalized in geriatric wards, who were prescribed urine culture for UTI symptoms or/and infection without primary sites for which a urine culture was prescribed. Dipstick urinalyses were performed for all patients. Clinical and biological characteristics of all patients were compared according to the final diagnosis of UTI. Moreover, results of dipstick tests were evaluated for the diagnosis of UTI in this population. RESULTS: Among 165 patients, 67 (40.6 %) had a UTI and 98 (59.4 %) had another diagnosis. These two groups were comparable for age and daily-living activities. In the UTI group, the proportion of women was higher than in the other group (P<0.05), and mean MMSE score was lower (P<0.05). Positive urine dipstick test for leukocytes and/or nitrites had high sensitivity (92 %), but low specificity (50 %). Negative predictive value of this test was high (91 %). CONCLUSION: For suspicion of UTI among elderly, few criteria are specific. Negative dipstick tests can suggest an absence of UTI due to its high negative predictive value.

Clearance of carbapenem-resistant Enterobacteriaceae vs vancomycin-resistant enterococci carriage after faecal microbiota transplant: a prospective comparative study.

BACKGROUND: Carbapenem-resistant Enterobacteriaceae (CRE) and vancomycin-resistant enterococci (VRE) carriage are increasing worldwide. Faecal microbiota transplantation (FMT) appears to be an attractive option for decolonization. This study aimed to evaluate CRE vs VRE clearance by FMT among carriers. METHODS: A multi-centre trial was undertaken on patients with CRE or VRE digestive tract colonization who received FMT between January 2015 and April 2017. Adult patients with CRE or VRE colonization, confirmed by three consecutive rectal swabs at weekly intervals, including one in the week prior to FMT, were included in the study. Patients with immunosuppression or concomitant antibiotic prescription at the time of FMT were excluded. Successful decolonization was determined by at least two consecutive negative rectal swabs [polymerase chain reaction (PCR) and culture] on Days 7, 14, 21 and 28, and monthly for three months following FMT. RESULTS: Seventeen patients were included, with a median age of 73 years [interquartile range (IQR) 64.3-79.0]. Median duration of carriage of CRE or VRE before FMT was 62.5 days (IQR 57.0-77.5). One week after FMT, three of eight patients were free of CRE colonization and three of nine patients were free of VRE colonization. After three months, four of eight patients were free of CRE colonization and seven of eight patients were free of VRE colonization. Qualitative PCR results were concordant with culture. Six patients received antibiotics during follow-up, three in each group. No adverse events were reported. CONCLUSION: CRE and VRE clearance rates were not significantly different in this study, possibly due to the small sample size, but a trend was observed. These data should be confirmed by larger cohorts and randomized trials.

Is faecal microbiota transplantation an option to eradicate highly drug-resistant enteric bacteria carriage?

Carbapenem-resistant Enterobacteriaceae (CRE) or vancomycin-resistant enterococci (VRE) carriage present a major public health challenge. Decolonization strategies are lacking. We aimed to evaluate the impact of faecal microbiota transplantation (FMT) on a cohort of patients with digestive tract colonization by CRE or VRE. Eight patients were included: six carrying CRE and two colonized by VRE. One month after FMT, two patients were free from CRE carriage, and another patient was free from VRE after three months. In our experience, this strategy is safe.

Efficacy of indefinite chronic oral antimicrobial suppression for prosthetic joint infection in the elderly: a comparative study.

BACKGROUND: During prosthetic joint infection (PJI), surgical management is sometimes impossible and indefinite chronic oral antimicrobial suppression (ICOAS) may be the only option. The outcomes of elderly patients who benefited from ICOAS with strictly palliative intent were evaluated. METHODS: A national retrospective cohort study was performed in France, involving patients aged >75 years with a PJI who were managed with planned life-long ICOAS from 2009 to 2014. Patients who experienced an event were compared to those who did not. An event was defined as a composite outcome in patients undergoing ICOAS, including local or systemic progression of the infection, death, or discontinuation of antimicrobial therapy because of an adverse drug reaction. RESULTS: Twenty-one patients were included, with a median age of 85 years (interquartile range 81-88 years). Eight of the 21 patients experienced an event: one had an adverse drug reaction, three had systemic progression of sepsis, and two had local progression. Two of the 21 patients died. No death was related to ICOAS or infection. There was no significant difference between the population with an event and the population free of an event with regard to demographic, clinical, and microbiological characteristics (p>0.05). CONCLUSIONS: ICOAS appeared to be an effective and safe option in this cohort.

Impact of an antimicrobial stewardship programme to optimize antimicrobial use for outpatients at an emergency department.

BACKGROUND: Antimicrobial stewardship programmes (ASPs) have been effective in optimizing antibiotic use for inpatients. However, an emergency department's fast-paced clinical setting can be challenging for a successful ASP. AIM: In April 2015, an ASP was implemented in our emergency department and we aimed to determine its impact on antimicrobial use for outpatients. METHODS: This was a single-centre study comparing the quality of antibiotic prescriptions between a one-year period before ASP implementation (November 2012 to October 2013) and a one-year period after its implementation (June 2015 to May 2016). For each period, antimicrobial prescriptions for all adult outpatients (hospitalized for <24h) were evaluated by an infectious disease specialist and an emergency department physician to assess compliance with local prescribing guidelines. Inappropriate prescriptions were then classified. FINDINGS: Before and after ASP, 34,671 and 35,925 consultations were registered at our emergency department, of which 25,470 and 26,208 were outpatients. Antimicrobials were prescribed in 769 (3.0%) and 580 (2.2%) consultations, respectively (P < 0.0001). There were 484 (62.9%) and 271 (46.7%) (P < 0.0001) instances of non-compliance with guidelines before and after ASP implementation. Non-compliance included unnecessary antimicrobial prescriptions, 197 (25.6%) vs 101 (17.4%) (P<0.0005); inappropriate spectrum, 108 (14.0%) vs 54 (9.3%) (P=0.008); excessive treatment duration, 87 (11.3%) vs 53 (9.1%) (P>0.05); and inappropriate choices, 11 (1.4%) vs 15 (2.6%) (P>0.05). CONCLUSION: The implementation of an ASP markedly decreased the number of unnecessary antimicrobial prescriptions, but had little impact on most other aspects of inappropriate prescribing.

Implementation of a simple innovative system for postprescription antibiotic review based on computerized tools with shared access.

BACKGROUND: Controlling antibiotic use in healthcare establishments limits their consumption and the emergence of bacterial resistance. AIM: To evaluate the efficiency of an innovative antibiotic stewardship strategy implemented over three years in a university hospital. METHODS: An antimicrobial multi-disciplinary team (AMT) [pharmacist, microbiologist and infectious disease specialist (IDS)] conducted a postprescription review. Specific coding of targeted antibiotics (including broad-spectrum ß-lactams, glycopeptides, lipopeptides, fluoroquinolones and carbapenems) in the computerized physician order entry allowed recording of all new prescriptions. The data [patient, antibiotic(s), prescription start date, etc.] were registered on an AMT spreadsheet with shared access, where the microbiologist's opinion on the drug choice, based on available microbiology results, was entered. When the microbiologist and pharmacist did not approve the antibiotic prescribed, a same-day alert was generated and sent to the IDS. That alert led the IDS to re-evaluate the treatment. FINDINGS: From 2012 to 2014, 2106 targeted antibiotic prescriptions were reviewed. Among them, 389 (18.5%) generated an alert and 293 (13.9%) were re-evaluated by the IDS. Recommendations (mostly de-escalation or discontinuation) were necessary for 136 (46.4%) and the prescribers' acceptance rate was 97%. The estimated intervention time was <30 min/day for each AMT member. This system allowed correct use of targeted antibiotics for 91.8% of prescriptions, but had no significant impact on targeted antibiotic consumption. CONCLUSION: This computerized, shared access, antibiotic stewardship strategy seems to be time saving, and effectively limited misuse of broad-spectrum antibiotics.

[Short-course antibiotic regimens: Up-to-date]. / Durée courte d'antibiothérapie.

Antibiotic treatment durations are not well documented. Yet, dramatic emergence of multi-drug resistant organisms should lead to tend to decrease antibiotic selection pressure. Furthermore, it could lower health costs and reduce associated adverse events. Unfortunately, only few studies with rigorous methodology have been performed. We present the available data on frequent infections such as urinary tract infections, community acquired pneumonia, bone and joint infections and intra-abdominal infections. We underline the difficulties to perform such trials and discuss original options to a better evaluation of treatment duration.

Community-acquired Clostridium difficile infections in emergency departments.

OBJECTIVE: Clostridium difficile infection (CDI) has become an emerging infectious disease, especially in community settings. Little data is available on its frequency and characteristics in France. We aimed to describe CDI case patients consulting at the emergency department and to compare community-acquired and nosocomial CDIs. PATIENTS AND METHODS: We conducted a multicenter retrospective study over a three-year period of community-acquired and nosocomial CDI case patients seen at the emergency department and compared their characteristics. RESULTS: A total of 2055 patients consulted for diarrhea during the study period and had a stool culture performed: 66 (3.2%) presented with a CDI, of which 28 were community-acquired and 26 were nosocomial. Community-acquired CDI patients had a mean age of 57.7years (18-91), with a sex-ratio of 0.65. At least one risk factor was observed in 24 patients (85.7%), of whom 22 (78.6%) had been prescribed a previous antimicrobial treatment. Diabetes mellitus and renal failure were more frequently observed in patients presenting with nosocomial CDI. They required fluid replacement and needed be to re-hospitalized more often than community-acquired patients. CONCLUSION: Community-acquired CDIs in the emergency department account for approximately 1.4% of patients presenting with diarrhea. One risk factor is present in 85.7% of cases. In our study, their presentation and outcome seemed less severe than nosocomial CDIs.