Isolation, Identification and Antifungal Susceptibility Testing of Candida Species: A Cross-sectional Study from Manipur, India

Abstract

Introduction: Candidiasis is an opportunistic infection which occurs due to indiscriminate and prolonged use of broad-spectrum antimicrobials, corticosteroids, immunosuppressive agents, diabetes mellitus, Human Immunodeficiency Virus (HIV), chronic renal failure, haemodialysis, renal transplantation or indwelling urinary catheter. Recently, Non-albicans Candida (NAC) species have replaced Candida albicans and emerged as an important opportunistic pathogens exhibiting decreased susceptibility to commonly used antifungal agents. Early speciation of Candida isolates along with their antifungal susceptibility testing not only will restrict the empirical use of antifungal agent but also greatly influence the treatment options for the clinicians. Aim: To speciate Candida isolates from various clinical specimens and to determine their antifungal susceptibility pattern. Materials and Methods: This study was a cross-sectional study carried out in the Mycology Section, Department of Microbiology, Jawaharlal Nehru Institute of Medical Sciences (JNIMS), Imphal, Manipur, India, from September 2016 to August 2018. Candida isolates were identified using standard microbiological procedures and speciation was done following conventional and HiCrome differential media. Antifungal susceptibility testing was determined by using Clinical and Laboratory Standards Institute (CLSI) disk diffusion method. Data analysis was done using descriptive statistics and Chi-square test. Results: A total of 100 isolates were identified from different clinical specimens, which included 43 (43%) from sputum, 34 (34%) from urine, in majority. Highest age was 92 years and lowest age was one year from whom the isolates were detected and females (57%) outnumbered males (43%) patients. Predominant Candida isolates were Candida albicans (44%), Candida tropicalis (32%). Among the azoles, the most sensitive agent was voriconazole (86%) and least was ketoconazole (56%), 81% of the total isolates were found sensitive to amphotericin B. Conclusion: The present study demonstrated that NAC spp. have surpassed Candida albicans and there is an increase in the resistance of the Candida isolates to commonly used antifungal agents. Therefore, this study highlights the need for speciation of Candida isolates upto species level and to determine the antifungal susceptibility pattern to decrease the morbidity and mortality of the patients.

Keywords

• antifungal agents
• candida albicans
• non-albicans candida
• speciation