- Research article
- Open Access
Clinical spectrum and factors impacting outcome of Candida auris: a single center study from Pakistan
BMC Infectious Diseases volume 19, Article number: 384 (2019)
An outbreak of Candida auris began globally in 2014 including Pakistan and since then it has emerged as a nosocomial multi-drug resistant pathogen. The aim of this study was to assess the clinical spectrum and outcome of patients, from a single center in Pakistan, in whom C. auris was isolated.
A retrospective study was conducted on 92 patients; ≥16 years with at least one culture positive for C. auris, at the Aga Khan University Hospital Karachi, Pakistan from Sept 2014-Mar 2017.Demographics, clinical history, management and outcome were studied. A logistic regression model was used to identify the risk factors for mortality.
We identified 92 patients with C. auris (193 isolates), of whom 52.2% were males. Mean age was 54.14 ± 20.4 years. Positive cultures were obtained after a median hospital stay of 14 days. Most patients had a history of surgery (57.6%), antibiotic use (95.6%), ICU stay (44.6%), indwelling lines (88.04%) and isolation of another multi-resistant organism (52.2%).Most patients were symptomatic (70.7%). Amongst these, 38 had candidemia while 27 had non-candidemia infections. Sites of infection included central lines (35), urinary tract (19), peritonitis (4), nosocomial ventriculitis (1), empyema (1), fungal keratitis (1) otitis externa (1) and surgical site (1). Fluconazole resistance was 100% while 28.5 and 7.9% were Voriconazole and Amphotericin resistant respectively. Overall crude mortality was 42.4% while 14-day mortality was 31.5%. Both infected and colonized cases shared similar mortality (46.2% vs 33.3%; p-value = 0.25). Among infected cases mortality was high in candidemia compared to non-candidemia (60.5% vs 25.9%) in which deaths related to C. auris were 34.2% vs 22.2% respectively. On multivariate analysis candidemia (AOR 4.2, 95% CI: 1.09–16.49; p-value = 0.037) was associated with greater mortality with source control being the only protective factor for mortality (AOR 0.22, 95% CI: 0.05–0.92; p-value0.038] while ICU stay, rapidity of blood culture clearance, DM, malignancy and MDR co-infection had no impact.
Patients with C.auris from a single center in Pakistan have a wide clinical spectrum with line associated infection being the predominant site of infection. Candidemia leads to high mortality while source control improves outcome.
Candida auris has emerged as an antifungal resistant yeast causing invasive infections in nosocomial settings. Improved diagnostics and epidemiological typing techniques are essential to identify and characterize these strains [1, 2]. It was first reported in Japan in 2009 when it was isolated from external ear canal . Later in 2011 it was reported for the first time as human pathogen causing nosocomial fungemia in South Korea and extremes of age with prior history of surgery was identified as a risk factor .C. auris was found to be closely related to Candida haemulonii and was reported to be misidentified as C. haemulonii using Vitek 2 YST and Phoenix (BD). There are numerous other misidentifications using the commercially available diagnostic methods. API 20CAUX misidentifies it as Rhodotorula glutinis and C. sake. Vitek 2 (bioMe’rieux) misidentifies it as C. haemulonii, C. lusitaniae and C. famata while MicroScan (Beckman Coulter Pasadena, CA) misidentifies this as C. famata, C. lusitaniae, C. guilliermondii, C. parapsilosis, C. albicans and C. tropicalis . This wrong identification delayed its diagnosis, a finding later endorsed by Kathuria S et al in 2015 . It is notable for its antifungal resistance creating a treatment dilemma [6,7,8].
In September 2014, Aga Khan University Hospital, Karachi, Pakistan experienced an outbreak of a yeast which was initially identified as Saccharomyces cerevisiae . Because of the unusual antifungal susceptibility pattern of this isolated yeast, these isolates were retested at the Centers for Disease Control and Prevention (CDC), Atlanta, USA for identification and were eventually identified as C. auris. Simultaneously this pathogen was reported from India, South Africa and Venezuela and came to lime light . So far, the available literature has emphasized on its methods of identification, antifungal susceptibility and risk factors associated with acquisition. Studies have shown that factors like extremes of age, presence of co-morbidities and prior antifungal therapy are associated with its acquisition while limited data is available on its disease spectrum and outcomes. Therefore, in this study, we have reported its clinical spectrum, outcomes and outcome determining factors among those with invasive infection. The aim of this study was to assess the clinical spectrum and outcome of patients, from a single center in Pakistan, in whom C.auris was isolated.
We had conducted a retrospective study of 92 hospitalized patients at the Aga Khan University Hospital (AKUH), a 600-bed tertiary care referral hospital located in Karachi, Pakistan. All patients with C. auris positive culture from September 2014–March 2017 were enrolled. Patients aged < 16 years or those who did not receive primary treatment at AKUH were excluded.
Cultures were processed by standard operating procedures in use by the microbiology laboratory as part of initial clinical work up. Any yeast from a sterile sample was identified on the basis of germ tube test, appearance on chromogenic medium BiGGY (Oxoid), cycloheximide tolerance, microscopic morphology on Cornmeal Agar (Dalmau method), and profile number on API 20C AUX (bioMe’rieux). If identification was inconclusive (less than 90% confidence on API), the antifungal susceptibility results for Fluconazole and the API number generated were taken into account. C. auris was presumptively identified by a combination of certain features: resistance to fluconazole, absence of pseudo hyphae on thin Cornmeal Tween80 agar, obtaining profile numbers 2,000,130, 2,000,173, 2,102,173, 6,102,173 on API 20C AUX (bioMe’rieux, France). This phenotype had been verified by D1-D2 sequencing of 28S subunit of rDNA performed on the first 15 isolates from our institute sent to the Mycotic Diseases Branch, CDC, Atlanta. There was 100% concordance between the described phenotype and sequencing results. Antifungal susceptibility was tested using SensititreYeastOne (Trek Diagnostic Systems Ltd., East Grinstead, England) and E-test (bioMe’rieux SA, Marcy l’Etoile, France). Susceptibilities against fluconazole, voriconazole, and amphotericin B were available for all isolates. For an additional 28 isolates MIC values were also available against itraconazole, posaconazole, anidulafungin, micafungin and caspofungin. The susceptibilities were interpreted for Candida species according to CLSI M27-S3 for triazoles and echinocandins and M27-A3 guidelines for amphotericin B [10, 11]. Briefly, based on these, the isolate was considered resistant to fluconazole if MIC was ≥64 μg/ml, voriconazole if MIC was ≥4 μg/ml, non-susceptible to amphotericin if MIC was > 1 μg/ml, echinocandins if MIC was > 2 μg/ml. isolates were considered susceptible if MIC to fluconazole was ≤8 μg/ml, voriconazole was ≤1 μg/ml, amphotericin was ≤1 μg/ml, and echinocandins was ≤2 μg/ml.
Demographic data including age, gender, date of admission, unit type and a brief history including risk factors (such as diabetes mellitus, malignancy, prior history of surgery, prior antibiotics or antifungal exposure, prior ICU stay, indwelling lines and history of isolation of any other multi-resistant organism), site of infection and outcomes were collected using data collection forms. Data was collected by the primary author only. Patients with C. auris in cultures and associated clinical sign and symptoms (including but not limited to fever, site specific symptoms and relevant laboratory parameters such as white blood cells and C-reactive protein) were labeled as symptomatic/infected. On the other hand, patients lacking associated clinical signs and symptoms with C. auris isolated from non-sterile sites were considered asymptomatic/colonized. In case of multiple positive cultures from the same patient the date of first positive culture was considered as the date of infection/colonization. The site of infection was labeled using CDC definitions . As candida is excluded from CDC’s definition for urinary tract infections (UTI), this was defined as clinical sign and symptoms of a UTI with positive urine culture in the presence of urinary WBC and absence of epithelial cells. Asymptomatic candiduria was defined as presence of C. auris in urine without clinical sign and symptoms. Standard criteria were used for the definition of diabetes mellitus and malignancy. Use of prior antimicrobials was defined as administration of any antibiotic/ antifungal in last 90 days of positive blood culture. Isolation of other multi-drug resistant (MDR) bacteria before isolating C. auris was defined as bacteria that were resistant to more than 3 classes of antibiotics, isolated in last 90 days of positive blood culture for C. auris while co infection with MDR bacteria was their isolation within 7 days of positive culture for C. auris. Whenever the given antifungal agent was in standard-weight based dosage according to site of infection, and when the isolate was reported as susceptible to it on culture, antifungal therapy was considered appropriate. This is in accordance with our institute’s antifungal policy. For all invasive candida cases the first line empiric antifungal therapy was intravenous Amphotericin B deoxycholate 0.75 mg/kg. Lipid formulations of amphotericin B were not used. Voriconazole was considered in cases with deranged renal functions when amphotericin could not be administered. It was given in a dose of 6 mg/kg 12 hourly on day 1 followed by 4 mg/kg 12 hourly. Therapeutic drug monitoring for voriconazole was not available. Early appropriate antifungal therapy was the appropriate antifungal therapy given in ≤48 h while late appropriate antifungal therapy was started 48 h after positive culture. Source control was defined as the removal of inciting agent or focus and entailed the removal of central line in case of Central Line Associated Blood Stream Infection (CLABSI), Foley’s catheter in Catheter Associated Urinary Tract Infection (CAUTI), exploratory laparotomy in peritonitis, drainage of pus collection and removal of lumbar drain in ventriculitis. Early source control was the removal of inciting agent in ≤48 h while late source control was when it was achieved after 48 h of positive culture. Only crude mortality rate (CMR) was assessed. Microbiological failure was considered in candidemia patients and was defined as failure to clear blood culture within 4 days while clinical failure was defined as 14-day mortality or microbiological failure. We considered 14-day mortality as there were large number of patients who lost to follow-up during the retrospective chart review. In patients who did not survive, cause of death was also assessed by physicians on clinical and laboratory evidence, and was thought to be related to C. auris when other causes of death were excluded and patient had an active C. auris infection at that time.
We sought ethical approval from University’s Ethics Review Committee (ERC number 4381-MED-ERC-2016). The committee waived the requirement for informed consent. To preserve confidentiality, we coded each patient and removed their original identifications.
The collected data were analyzed through Statistical Package for the Social Sciences (SPSS), version 22.0. For continuous data, mean and standard deviation/ median with interquartile range were reported depending on normality assumption. For categorical data frequency and percentage were reported. In order to assess association of mortality with independent variables Chi square test was applied and P value < 0.05 was considered significant. Variables for univariate analysis were based on known risk factors of mortality for invasive candidiasis and on the preliminary analysis of our ongoing outbreak study on C. auris [9, 13]. All statistically significant and clinically relevant variables of univariate analysis were included in a multivariate logistic regression analysis to determine the independent predictive factors of mortality among infective C. auris cases. Results were given as odds ratios (OR) and 95% confidence intervals (95% CI).
From 2014 to 2017, 193 C. auris strains were isolated from 92 patients with 16.3% confirmed as C. auris by D1-D2 sequencing while rest were presumed to be C. auris. The number of cases with C. auris rose over the study period from 13 patients in the last quarter 2014 to 46 in 2016 (Fig. 1: Epi-curve of C. auris cases). Table 1 describes the baseline characteristics of the patients. The median days from admission to positive culture was 14 (IQR-7-130). Most of the patients were older (median age 55.5 years), were currently or previously admitted to an Intensive Care Unit/ High Dependency Unit (ICU/HDU), had indwelling lines (central lines and drains), and received antibiotics. One in three patients (39.1%) had also received antifungals in last 90 days of positive culture. Fifty-two percent had MDR bacteria isolated from different sites prior to C. auris while 31.5% had a concomitant MDR bacterial infection.
Antifungal susceptibility was checked in isolates from 63 patients (68.4%) in which fluconazole resistance was seen in all, voriconazole resistance in 18 (28.6%) and amphotericin resistance seen in 5 (7.9%) patients. Isolates from 3 patients (4.76%) were resistant to 2 classes of antifungals (azoles and polyenes) while none were resistant to all classes tested. No echinocandin resistance was detected.
Of the 193 C. auris strains, majority were isolated from blood (75/193) and urine (83/193). Out of 83 urine specimens 73 were from indwelling catheters, while 10 were mid-stream urine samples. Only 21 patients (22.8%) isolated C. auris from 2 or more sites.
Of the 92 patients, 65 (70.7%) were infected while 27 (29.3%) were colonized with C. auris. Amongst the infected patients, the most common site of infection was the bloodstream accounting for 38 (41.3%) cases, most of which were CLABSIs (35, 38.4%). Of the CLABSI patients, 9 (25.71%) were complicated by seeding to different organs causing endovascular thrombosis or empyema. Source of the fungemia could not be identified in 2 patients. Among non-candidemia patients, UTI was the most commonly seen site infected (19 of 27 patients) with 11 having CAUTI and 8 non-catheter associated UTI.
Of the 65 infected patients, 55 were treated with antifungals, amongst which only 44 patients (67.7%) received the appropriate antifungal therapy. Early appropriate antifungal therapy was administered to 20 (45.5%) patients. Amongst the patients who received appropriate antifungal therapy, majority received amphotericin alone (42, 95.5%) while 2 patients were treated with voriconazole alone. However, 7 patients who initially received amphotericin were later switched to voriconazole. Simultaneous dual antifungal therapy was not given to any patient.
Out of 38 patients with candidemia, 31 (81.57%) received appropriate antifungal therapy for a mean duration of 18.8 days. Only amphotericin was used to treat candidemia. Early appropriate antifungals were administered in 16 (51.6%) candidemia patients. However, mortality was higher in those receiving early antifungals (11 of 16, 68.7%) compared to those who received antifungals late (7 of 15; 46.7%). There were 7 patients who did not receive antifungal therapy, of which 2 cleared their candidemia with source control alone. Culture clearance was achieved in 25 out of 27 patients in whom clearance was checked. However, microbiological failure (i.e. lack of clearance within 4 days) was seen in 11 patients. Clearance could not be checked in 10 of the remaining 11 patients due to early mortality.
Amongst the 27 non-candidemia patients, 22 received antifungal, of which 13 were appropriate. In particular, of the 19 patients with UTI, 10 received appropriate antifungal therapy for a mean duration of 12 days. In 8 (72.7%) of the 11 patients with CAUTI, the catheter was removed. Five patients did not receive any antifungal, out of which 2 died within 24 h of the positive culture. Patients with keratitis received topical and systemic amphotericin while otitis externa was managed with clotrimazole ear drops. Compared to non-candidemia, candidemia patients had a higher mortality rate (60.5% vs. 25.9%; p-value = 0.006) and higher 14-day mortality (44.7% vs. 22.2%; p-value = 0.019).
Urine was the most common site of C. auris isolation in asymptomatic patients (21/27) of whom 17 were catheterized. While the catheter was removed in 10 of these patients, repeat cultures were sent in 2 patients only, both of which were negative. Table 2 compares characteristics and outcomes of infected and colonized C. auris cases. There was no difference in gender, age distribution, location in hospital, co-morbidities, co-infection with MDR bacteria and probability of dying between the two.
The median length of hospital stay in all patients was 25 days (IQR 1–163). The CMR was 39 (42.4%) in which 19 deaths (48.7%) were related to C. auris. The 14-day mortality was 29 (31.5%) and the median days in which mortality occurred was 7 (IQR 1–69).
Table 3 shows details C. auris infective cases and mortality impacting factors. The mean days in which mortality occurred was 5.26 days and 14- day mortality rate was 94.7%.Compared to the infected survivors, these patients were more likely to be older (56–75 years, AOR 4.5, 95%CI:1.1–18.9) and had candidemia (AOR 4.2, 95%CI: 1.1–16.5). Survivors were also more likely to have had adequate source control (AOR 0.2, 95%CI: 0.1–0.9).
We describe the clinical characteristics and outcomes of patients in whom C. auris was isolated in a single center in Pakistan. We found a wide clinical spectrum ranging from asymptomatic patients to invasive disease including candidemia, urinary tract infections, empyema and ventriculitis. Most of the infections occurred in critically ill patients who were admitted for a prolonged period of time.
The crude in-hospital mortality was 42.4% which is similar to the mortality rate seen in other studies ranging from 35.2–60% [9, 14]. A total of 31.5% of the deaths were related to C. auris infection, majority of whom died within the first week of acquiring this. This high mortality rate is in contrast with the UK outbreak reported by Schelenz Setal where no deaths were directly attributable to C. auris . As expected candidemia patients had a higher mortality, though interestingly, antifungal therapy did not make a difference in the mortality. Also, paradoxically we found that mortality was higher in those who received early antifungal treatment; however this is likely reflective of the severity of their illness which prompted rapid initiation of amphotericin which is in contrast to other studies [6, 16]. Moreover, we could not check if this difference was statistically significant due to the small numbers involved. Mortality was also higher in the older patients, which has been shown in several other studies [15, 17, 18]. The most important factor impacting outcome was adequate source control. This is in line with established treatment guidelines for treating invasive candidiasis . On the other hand, contrary to other studies, diabetes and malignancy were not associated with mortality in our study, possibly due to small numbers .
We found an annual increase in the number of identified cases at our institute. While patients with C.auris are managed with barrier precautions, single room isolation is not possible due to space constraints. Similarly, costs preclude obtaining environmental and patient surveillance cultures. As a result, clonal spread of our strains of C.auris has been documented and highlights the challenges of infection prevention in resource limited countries .
Despite skepticism regarding the propensity of C. auris to cause urinary tract infection or empyema as stated by CDC, we have found that UTI was the second most common site for symptomatic infection . Moreover, we describe several unusual infection sites including wound, peritoneum, otitis externa, keratitis, ventriculitis and empyema. However, as expected bloodstream infection, in particular CLABSI was the most common infection seen.
The strength of our study is the large number of patients with comprehensive clinical data, giving a better understanding of the spectrum of disease caused by C.auris. Moreover, this is the largest series looking at the gamut of infections caused by the South Asian strain of C.auris in both ICU and non-ICU patients. However, our study has several limitations. Firstly, the data was retrospectively collected leading to potential information bias. Secondly, and perhaps more importantly, not all of our C. auris isolates were confirmed by sequencing. However, the characteristic phenotype we have described had 100% concordance in the 15 strains in which D1-D2 sequencing was performed. Similarly, we were unable to perform genetic antifungal resistance testing. However, of the 15 strains from Pakistan which underwent whole genome sequencing 2 distinct ERG 11 hotspot mutations were identified: Y123F and K143R .
In conclusion, C.auris is associated with a wide variety of invasive infections and carries a high mortality rate. Source control is the most effective therapeutic intervention to reduce mortality in these critically ill patients.
- 95% CI:
95% Confidence Interval
Aga Khan University Hospital
Adjusted odds ratio
- C. auris :
Catheter Associated Urinary Tract Infection
Centers for Disease Control and Prevention
Central Line Associated Blood Stream Infection
Crude mortality rate
High dependency unit
Intensive care unit
Multi drug resistant
Statistical Package for the Social Sciences
Urinary Tract Infection
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The authors thanks all the other members of the Section of Infectious Diseases at Aga Khan University: Bushra Jamil for providing mentorship; Kiren Habib, Nosheen Nasir, Sadia Amir, Aneela Hussain and Sara Ahmed for identification of cases admitted to hospital; Section of Microbiology at Aga Khan University: Fizza Farooqui, Yusra Shafqat and Faheem Naqvi for retrieving microbiological data of strains; HIMMS at Aga Khan University: Nobel Joseph for retrieving medical records.
This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.
Availability of data and materials
The datasets used and/or analyzed during the current study are available from the first author and corresponding author on reasonable request.
Syed Faisal Mahmood, M.B.B.S, DABIM, DABIM (ID), Associate Professor, Section of Infectious Diseases, Department of Medicine, Aga Khan University, Karachi, Pakistan.
Muneeba Ahsan Sayeed, M.B.B.S, FCPS (Medicine), FCPS (ID), ID Fellow, Section of Infectious Diseases, Department of Medicine, Aga Khan University, Karachi, Pakistan.
Joveria Farooqi, M.B.B.S, FCPS (Microbiologist), MSc (Epidemiology and Biostatistics), Assistant Professor, Section of Microbiology, Department of Pathology, Aga Khan University, Karachi, Pakistan.
Kausar Jabeen, M.B.B.S, FCPS (Microbiologist), MSc (Medical Mycology), Associate Professor, Section of Microbiology, Department of Pathology, Aga Khan University, Karachi, Pakistan.
Safia Awan, MSc Statistics, Senior Instructor Research, Department of Medicine, Aga Khan University, Karachi, Pakistan.
Ethics approval and consent to participate
We sought ethical approval from Aga Khan University’s Ethics Review Committee (ERC number 4381-MED-ERC-2016). The committee waived the requirement for informed consent. To preserve confidentiality, we coded each patient and removed their original identifications.
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The authors declare that they have no competing interests.
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Sayeed, M.A., Farooqi, J., Jabeen, K. et al. Clinical spectrum and factors impacting outcome of Candida auris: a single center study from Pakistan. BMC Infect Dis 19, 384 (2019). https://doi.org/10.1186/s12879-019-3999-y
- Candida auris
- Candidemia, urinary tract infection