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A complete clinico-epidemiological and microbiological profile of candidemia cases in a tertiary-care hospital in Western India

Published online by Cambridge University Press:  07 March 2022

Ekadashi Rajni
Affiliation:
Department of Microbiology, Mahatma Gandhi University of Medical Sciences & Technology, Jaipur, Rajasthan, India
Preeti Chaudhary
Affiliation:
Department of Microbiology, Mahatma Gandhi University of Medical Sciences & Technology, Jaipur, Rajasthan, India
Vishnu Kumar Garg
Affiliation:
Department of Anaesthesiology, Mahatma Gandhi University of Medical Sciences & Technology, Jaipur, Rajasthan, India
Rajani Sharma*
Affiliation:
Department of Microbiology, Government Medical College, Bhilwara, Rajasthan, India
Manisha Malik
Affiliation:
Department of PSM (Community Medicine), Churu Medical College, Churu, Rajasthan, India
*
Author for correspondence: Dr Rajani Sharma, Department of Microbiology, Government Medical College, Sindri ke Balaji, Road, Bhilwara, Rajasthan311011, India. E-mail: [email protected]

Abstract

Objective:

To identify different Candida spp along with antifungal susceptibility pattern and risk factors associated with candidemia.

Design, setting, and patients:

This retrospective observational study was conducted in a tertiary-care academic hospital in Jaipur, Western India, for 3 years (July 2017–June 2020).

Methods:

Blood cultures were performed according to standard microbiological methods, and only 1 isolate per patient was included in the study. Isolates of Candida spp were identified using a VITEK-2 automated system and matrix-assisted laser desorption ionization-time of flight mass spectrometry. Antifungal susceptibility tests were performed using the broth microdilution assay according to the Clinical and Laboratory Standards Institute guidelines.

Results:

Of 3,443 blood cultures received from suspected sepsis cases, candidemia was identified in 95 (2.8%). In addition to Candida tropicalis (n = 36; 38%) and Candida parapsilosis (n = 17; 18%), 10 isolates of Candida auris comprised the fourth most common cause of candidemia. Presence of central venous catheter and diabetes were statistically significant risk factors for development of candidemia by NAC. Resistance to fluconazole was 36%, resistance to voriconazole was 20%, resistance to 5-flucytosine was 4%, and resistance to amphotericin-B was 7%. C. auris isolates were more resistant than other NAC spp. We detected no resistance among the echinocandins.

Conclusions:

The emergence of highly resistant isolates like C. auris emphasizes the need for constant monitoring of candidemia cases for species identification and routine antifungal susceptibility so that appropriate measures can be taken to reduce the related morbidity and mortality.

Type
Original Article
Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution and reproduction in any medium, provided the original article is properly cited.
Copyright
© The Author(s), 2022. Published by Cambridge University Press on behalf of The Society for Healthcare Epidemiology of America

The term candidemia refers to the presence of Candida spp in the blood. It is the most common form of invasive candidiasis among hospitalized patients. It is associated with high crude and attributable mortality rates along with increased duration of hospitalization and cost of care. Although earlier studies have ranked Candida species as the seventh most common causative organism of healthcare-associated bloodstream infection (BSI), Reference Marchetti, Bille and Fluckiger1 more recent studies place them third or fourth. Reference Pfaller and Diekema2,Reference Chander, Singla, Sidhu and Gombar3

The evolution of complex medical and surgical procedures undertaken to prolong the survival of critically ill patients, coupled with usage of antibiotics and antifungals for elongated periods, has led to an increase in the incidence of candidemia. Simultaneously, a massive shift in landscape of candidemia is being reported on a global level. Although C. albicans is still a common causative species, increasing rates of candidemia caused by C. tropicalis, C. parapsilosis, C. glabrata, and C. krusei have been reported worldwide. Reference Tak, Mathur, Varghese, Gunjiyal, Xess and Misra4Reference Kossoff, Buescher and Karlowiczm7 The emerging fungal pathogen C. auris is causing outbreaks of invasive disease in healthcare facilities around the world. Reference Chowdhary, Sharma and Meis8,Reference Rudramurthy, Chakrabarti and Paul9 Furthermore, growing resistance to commonly used first- and second-line antifungals (ie, fluconazole and echinocandins) represents a major challenge for empirical and prophylactic strategies.

The epidemiology of candidemia varies remarkably according to geographic regions. Candida albicans is the predominant species causing candidemia in Malaysia, Singapore, Thailand, Australia, and Japan, but C. tropicalis is predominant on the Indian subcontinent and neighboring countries. Reference Wang, Xu and Hsueh10 Continuous surveillance is thus mandatory for monitoring trends in local incidence, species distribution, and antifungal susceptibility profiles.

Data pertaining to contemporary epidemiology of candidemia from Western India are sparse. Our comprehensive study addresses issues like the prevalence of candidemia, its etiology, and the antifungal susceptibility profiles from Jaipur, Rajasthan. In addition, this study also provides insight into associated risk factors and susceptibility profiles between C. albicans and non-albicans Candida (NAC) cases. To the best of our knowledge, no previous study from Rajasthan has addressed these critical issues. The information gained from this study should help both clinicians and microbiologists in developing an empirical antifungal therapy module and aggressively handling candidemia cases.

Methods

This retrospective, single-center observational study was conducted in a 1,500-bed tertiary-care private sector hospital in Jaipur, Western India, for 3 years (July 2017–June 2020). Candidemia is defined as isolation of any Candida spp from 1 or more blood cultures of a patient in the presence of clinical features of sepsis. All blood culture results of suspected sepsis cases during the study period at our center were screened and all patients diagnosed with candidemia were included in the study. Only 1 isolate per patient was included.

Blood culture was performed using an automated method (BACTEC 9050, Becton Dickinson, Franklin Lakes, NJ). Isolates of Candida spp were identified using a VITEK-2 automated system (bioMèrieux, Marcy-l’Étoile, France) with VITEK 2 (YST) cards. Candida isolates that could not be identified conclusively by VITEK-2 were subjected to matrix-assisted laser desorption ionization-time of flight mass spectrometry (MALDI-TOF MS; Bruker Biotyper OC version 3.1, Daltonics, Bremen, Germany) using an ethanol formic acid extraction protocol. Antifungal susceptibility tests were performed using the broth microdilution assay according to the Clinical and Laboratory Standards Institute guidelines. 11

Electronic patient records were reviewed from hospital information management system. Patient data regarding duration of hospital stay, demographic details, baseline characteristics, comorbid illnesses, laboratory findings, clinical outcome or any medical procedures performed were obtained and tabulated in an Excel worksheet (Microsoft, Redmond, WA).

Statistical analysis

The data were cleaned and coded. Prevalence was measured as cases per 100 samples along with 95% confidence limits. Demographic and clinical characteristics of patient were expressed as numbers and percentages for categorical variables. The association of these variables with C. albicans was analyzed using the χ Reference Pfaller and Diekema2 test. Comparison of antifungal susceptibility between NAC and C. albicans was inferred using the χ Reference Pfaller and Diekema2 test results. All analyses were conducted using SPSS version 20 software (IBM, Armonk, NY). A P value < .05 was considered statistically significant.

Approval for this study was obtained from our institutional ethical committee (no. MGMCH/IEC/JPR/2020/182).

Results

In total, 3,443 blood samples from suspected sepsis cases were received at our center during the 3-year study period, and Candida spp were isolated in 95 (2.8%) samples. An upward trend in Candida spp isolation was noted over the 3-year study period. The prevalence of candidemia in sepsis cases increased from 23 cases (0.7%) in July 2017–June 2018 to 30 cases (0.9%) in July 2018–June 2019 and to 42 cases (1.2%) in July 2019–June 2020 (Fig. 1). The prevalence of candidemia was significantly higher in the ICU compared to other wards: 79% vs 21% (P < .001).

Fig. 1. Year-wise rising trend of candidemia over the 3-year study period.

Table 1 shows the distribution of various Candida spp isolated from blood. Of the 95 Candida strains isolated, the prevalence of NAC (n = 85, 89%; 95% confidence interval [CI], 81.7%–94.2%) was higher than that of C. albicans (n = 10, 11%). Among the NAC, C. tropicalis (n = 36, 38%) was the most common isolate, followed by C. parapsilosis (n = 17, 18%), C. famata (n = 11, 12%), C. auris (n = 10, 11%) and C. glabrata (n = 5, 5%).

Table 1. Distribution of Various Candida spp Isolated From Blood

Clinico-epidemiological features

The clinical and demographic features of candidemia cases are summarized in Table 2 which shows a male preponderance with a male-to-female ratio of 2:1. Most cases were observed in the group aged 19–60 years. No statistically significant difference was noted in sex or age-group distribution between cases caused by C. albicans and NAC.

Table 2. Clinical Epidemiological Characteristics and Risk Factor Distribution Among Various Candida spp Causing Candidemia

Note. ICU, intensive care unit; CVC, central venous catheter; TPN, total parenteral nutrition; HIV, human immunodeficiency virus.

The most common risk factor associated with candidemia was broad-spectrum antibiotic usage (68%), followed by presence of central venous catheter (49%), urinary catheterization (45%), and corticosteroid therapy (34%). Comorbid diabetes was present in 46% of patients, and comorbid hypertension was present in 37%. The presence of a central venous catheter and diabetes were statistically higher in cases of candidemia caused by NAC in our study (P = .04) (Table 2).

Of the 95 candidemia cases, 24 (25%) succumbed to infection, whereas 42 (44%) recovered completely. Clinical outcomes could not be ascertained for 29 patients (31%) because they left against medical advice.

Antifungal susceptibility

Figure 2 shows the antifungal susceptibility pattern to various drugs tested. C. albicans were 100% sensitive to caspofungin (CAS), micafungin (MIC), and 5-flucytosine (5-FC). Resistance to fluconazole (FLC) was observed in 2%, resistance to voriconazole (VRC) was observed in 1%, and resistance to amphotericin B was observed and 3%. Among the NAC isolates, 100% sensitivity was noted for the echinocandins (caspofungin and micafungin). Resistance to amphotericin B was statistically higher among NAC isolates (P = .03) (Table 3).

Fig. 2. Resistance pattern of Candida spp (%) to different antifungal drugs.

Table 3. Comparison of Antifungal Susceptibility Between Non-albicans Candida and Candida albicans

Note. NAC, non-albicans Candida.

Figure 3 highlights the antifungal susceptibility pattern of C. auris isolates (n = 10).

Fig. 3. Resistance pattern of Candida auris with different antifungal drugs.

Discussion

This study was conducted to elucidate the complete current epidemiology of candidemia cases in a tertiary-care teaching hospital in Jaipur. Among all blood cultures received from suspected sepsis cases, Candida spp were isolated from 95 (2.8%), with a steady increase in the number of cases from July 2017 to June 2020. Similar prevalence rates have been documented in several studies conducted in different parts of country. Reference Bhatt, Sarangi and Paty12Reference Xess, Jain, Hasan, Mandal and Banerjee14 The predominance of candidemia in male patients, as observed in the current study, was also observed by Bhattacharjee et al in 2016. Reference Bhattacharjee15

The prevalence of candidemia was more common in ICUs than in wards, and the difference was statistically significant (P < .001). Patients admitted to an ICU occupy a complex ecological niche that facilitates colonization and subsequent development of invasive candidiasis. These factors include exposure to high-end antibiotic therapy, invasive procedures, presence of indwelling devices, comorbidities, etc. In our study, the most common risk factor associated with candidemia was long-term antibiotic therapy (68%), followed by the presence of a central venous catheter (49%). These results agree with those of other studies by Xess et al, Reference Xess, Jain, Hasan, Mandal and Banerjee14 Giri et al, Reference Giri, Kindo and Kalyani16 and Chowta et al. Reference Chowta, Adhikari, Rajeev and Shenoy17 Prolonged use of broad-spectrum antibiotics alter commensal gut flora, which plays an important role in prevention of fungal overgrowth. The propensity of NAC species to form biofilms on catheters and other prosthetic devices exposes these patients to a further high risk of candidemia.

Isolation of NAC from candidemia cases has been steadily increasing over the past few years. NACs are known to be responsible for higher mortality rates due to increased virulence and reduced susceptibility to antifungal drugs. Our results reflect current trends of C. tropicalis (38%) as the most predominant species, followed by C. parapsilosis (18%). The ARTEMIS antifungal surveillance program also noted a decreasing trend in the isolation of C. albicans and an increase in NACs such as C. tropicalis (from 4.6% in 1997 to 7.5% in 2003) and C. parapsilosis (from 4.2% in 1997 to 7.3% in 2003). Reference Pfaller, Diekema and Rinaldi18 Similar observations have been reported by studies across India. Reference Chander, Singla, Sidhu and Gombar3,Reference Chakrabarti, Chatterjee and Rao5,Reference Giri, Kindo and Kalyani16,Reference Kaur, Singh and Rudramurthy19Reference Singh, Xess, Mathur, Behera, Gupta and Misra21 The most probable reason for this shift seems to be excessive use of fluconazole, which has led to a survival advantage for resistant species like NAC.

A noteworthy finding in our study is the isolation of C. auris from 10 cases (11%), ranking it the fourth most predominant isolate among all candidemia cases. This finding agrees with another recent study from a tertiary-care hospital in New Delhi where C. auris is the most common isolate, responsible for 39.9% cases. Reference Shastri and Shankarnarayan22 In the study by Rudramurthy et al Reference Rudramurthy, Chakrabarti and Paul9 involving 27 ICUs across India, 74 isolates of C. auris were reported, making it the fifth most common cause of candidemia. Reference Rudramurthy, Chakrabarti and Paul9 The emergence of this fungus is very concerning because it spreads in the hospital rapidly, it is resistant to multiple classes of antifungals, and it causes severe infections in critically ill patients. Another major issue is that the commonly employed phenotypic commercial system cannot identify this fungus accurately. Accurate identification of this yeast is of paramount importance when formulating a therapeutic plan. We hypothesize that this misidentification by conventional techniques could be the reason why only few studies from India have reported C. auris. Nevertheless, there is a need for clinicians to be aware of and prepared for any potential outbreak by this multidrug-resistant fungus. Notably, infection control practices are firmly in place and this situation is closely monitored in our hospital.

With wider and inappropriate use of antifungal drugs, antifungal resistance is likely to continue to increase. This trend will increase treatment costs in resource-poor countries like ours, where healthcare infrastructure is already strained. In our study, although NAC isolates were more resistant to antifungals than was C. albicans, the difference was statistically significant only for amphotericin B (P = .03). Similar findings have been reported in another study from northeastern India by Sabhapandit D et al. Reference Sabhapandit, Lyngdoh, Bora, Prasad, Debnath and Elantamilan23

Resistance to fluconazole has been observed in 38% of isolates, with NACs being more resistant than C. albicans (36% vs 2%). This finding is of concern because alternative drugs like echinocandins or amphotericin B are more expensive. Kothari et al Reference Kothari and Sagar24 from New Delhi have also reported 36% fluconazole resistance in candidemia isolates. Similar levels of resistance have been reported by other researchers as well. Reference Giri, Kindo and Kalyani16,Reference Adhikary and Joshi20,Reference Gupta, Mittal, Sood, Kumar, Kaur and Mathur25,Reference Verma, Vyas, Sharma and Maheshwari26 Resistance to amphotericin B has been observed in 10.5% isolates. Similar rates of resistance have been reported in other contemporary studies as well. Reference Sabhapandit, Lyngdoh, Bora, Prasad, Debnath and Elantamilan23,Reference Verma, Vyas, Sharma and Maheshwari26 Resistance to amphotericin B was significantly high in NAC isolates in our study.

A ray of hope is that no echinocandin resistance has been observed in our study isolates. Among all antifungals, echinocandins are considered superior because of their broad spectrum of action and fewer side effects. Their high cost and limited availability, however, do not make them an easy choice for resource-constrained countries. Few studies have reported resistance to echinocandins Reference Kaur, Singh and Rudramurthy19 ; hence, they may be considered the drug of choice for azole-resistant isolates.

Among the 95 Candida isolates in our study, resistance to 5-FC was observed in only 4.21%. A wide variation in resistance pattern for 5-FC from various studies in India has been reported, ranging from 11.46% to 37%. Reference Bhatt, Sarangi and Paty12,Reference Vinodkumar, Umakanth, Kalapanavar and Basavarajappa27 This pattern is probably related to difference in usage of this antifungal agent in different settings. Resistance to 5-FC is less likely to develop if it is used in combination with other antifungal drugs.

Amongst the C. auris strains (n = 10), resistance to fluconazole, voriconazole, amphotericin B and 5-FC was observedin 94%, 35%, 35% and 8% isolates respectively (Fig. 3). No resistance was noted for echinocandins. A multicenter study by Chowdhary et al Reference Chowdhary, Prakash and Sharma28 has highlighted ∼90% azole resistance in C. auris isolates. Reference Chowdhary, Prakash and Sharma28 A recent study by Shastri et al Reference Shastri and Shankarnarayan22 also reports ∼97% fluconazole resistance in C. auris isolates. Reference Shastri and Shankarnarayan22

The study had several limitations. First, the retrospective design of study may have prevented us from identifying all risk factors related to candidemia cases. With the onset of the current coronavirus 2019 (COVID-19) pandemic, the institute was converted into a designated COVID-19 care center. Maximum resources were diverted towards catering to the needs of COVID-19 patients. Therefore, this data may be a slight under representation especially in later one-thirdpart of study period. Nevertheless, our results provide clear insight into the prevalence, epidemiology, and antifungal susceptibility pattern of candidemia in our setting during contemporary times.

Candidemia continues to be a considerable cause of morbidity and mortality. The shift in epidemiology and increasing resistance to antifungals emphasize the need for constant monitoring of these cases. The clinical importance of species-level identification of etiological agents of candidemia cannot be overemphasized. C. auris is an emerging fungal pathogen, and the medical community needs to be on high alert regarding this yeast. The insights obtained from this study will be helpful in guiding clinical management and developing antifungal stewardship guidelines.

Acknowledgements

The authors thank Dr Anuradha Chowdhary, Professor, Department of Medical Mycology, Vallabhbhai Patel Chest Institute, Delhi, for contributing in identification of isolates by MALDI-TOF MS and antifungal susceptibility testing. Additionally, she provided valuable suggestions for this manuscript.

Financial support

No financial support was provided relevant to this article.

Conflicts of interest

All authors report no conflicts of interest relevant to this article.

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Figure 0

Fig. 1. Year-wise rising trend of candidemia over the 3-year study period.

Figure 1

Table 1. Distribution of Various Candida spp Isolated From Blood

Figure 2

Table 2. Clinical Epidemiological Characteristics and Risk Factor Distribution Among Various Candida spp Causing Candidemia

Figure 3

Fig. 2. Resistance pattern of Candida spp (%) to different antifungal drugs.

Figure 4

Table 3. Comparison of Antifungal Susceptibility Between Non-albicans Candida and Candida albicans

Figure 5

Fig. 3. Resistance pattern of Candida auris with different antifungal drugs.