ABSTRACT
Con el objeto de conocer las especies causantes de candidosis humanas en pacientes HIV positivos o con otras inmunodeficiencias secundarias y la incidencia de especies con capacidad de resistencia a antifúngicos, se estudiaron 76 aislamientos de Candida procedentes de 61 casos de candidosis superficiales y profundas de niños y adultos. Obtenidas desde piel, anexos, mucosas, abscesos, catéteres y secreciones diversas, entre otras. La identificación de las especies fue realizada por estudios de características morfológicas, cromogénicas y bioquímicas (CHROMagar , Candifast, API 20 y API 32). Los resultados revelan predominio de especies noalbicans (52.7 por ciento), obteniéndose las siguientes frecuencias de aislamientos: C.albicans (47,3 por ciento), C. parapsilosis: 15,8 por ciento, C. glabrata: 13,2 por ciento, C. krusei: 11,8 por ciento, C. tropicalis: 10,6 por ciento y C. dubliniensis: 1,3 por ciento. Algunas de ellas pueden presentar resistencia primaria o secundaria a algunos antifúngicos de uso habitual, por lo cual es necesario incluir estudios de sensibilidad a estos, para una mejor conducta terapéutica.
In order to find out species causing human candidosis in positive HIV patients or in individuals suffering from other secondary immunodeficiencies and the incidence of species bearing a resistance ability to antifungal agents, 76 Candida isolations obtained from 61 cases of superficial and deep candidosis in children and adults were studied. Samples were collected from skin, annexa, mucosities, abscesses, catheters and diverse secretions, among others. The identification of species was carried out through studies on morphological, chromogenic and biochemical characteristics (CHROMagar, Candifast, API 20 and API 32). Results reveal a predominance of non-albican species (52,7 percent), and the following frequencies of isolation: C.albicans (47.3 percent), C. parapsilosis: 15.8 percent, C.glabrata: 13.2 percent, C. krusei: 11.8 percent, C. tropicalis: 10.6 percent and C. dubliniensis: 1.3 percent. Some of them may exhibit some primary or secondary resistance to certain antifungal agents of common use, this is why it is necessary to include studies on sensitivity of them so as to attain a better therapeutical behaviour.
Subject(s)
Humans , Male , Adult , Female , Child , AIDS-Related Opportunistic Infections , Antifungal Agents/antagonists & inhibitors , Antifungal Agents/therapeutic use , Candidiasis/classification , Candidiasis/etiology , Candidiasis/genetics , Candidiasis/microbiology , Candidiasis/prevention & control , Candidiasis/therapy , Candidiasis/transmission , Argentina , Immune System Diseases/complicationsABSTRACT
BACKGROUND & OBJECTIVES: Candidaemia is an important cause of mortality in hospital settings. Limited information is available from India on nosocomial candidaemia. The objective of the present study was to isolate and identify yeasts from patients suspected to have nosocomial bloodstream infection (BSI) and to determine the carriage rate of Candida species, risk factors for acquisition of infection and mortality in this group of patients. METHODS: Blood samples from 4871 patients suspected to have BSI at least 48 h after admission were cultured following standard protocol to isolate and identify the pathogens. Clinical details, possible risk factors and outcome of all candidaemic patients were recorded and analysed. Samples of hand washings and throat gargles from these patients were also cultured to determine the carriage rate. Candida albicans isolated from patients and their carriage sites were genotyped by randomly amplified polymorphic DNA (RAPD) analysis to study strain relatedness. RESULTS: Twenty one patients with candidaemia were detected with mortality of 55 per cent. Candidaemia per 1000 admissions was 1.61. Isolation of non-C. albicans Candida species was significantly higher than C. albicans (14/21 vs 7/21: P < 0.05). Use of broad-spectrum antibiotics (43%), gastrointestinal surgery (23%), immunosuppressive therapy (23%), protein calorie malnutrition with parenteral hyperalimentation (23%) and neutropaenia (14%) were identified as probable risk factors. The seven C. albicans strains isolated from patients with BSI were typed into 6 genotypes. Yeast carriage rate among the patients was 71.4 per cent. C. albicans isolated from the hand, throat and blood of two patients had identical genotype. INTERPRETATION & CONCLUSION: BSI due to non-C. albicans Candida species is more common than C. albicans in our patients and candidaemia is associated with high mortality. RAPD appears to be a simple method to study strain relatedness for C. albicans. There is a need for early diagnosis and systematic surveillance to meet the challenges of nosocomial candidaemia.