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 Table of Contents  
ORIGINAL ARTICLE
Year : 2015  |  Volume : 2  |  Issue : 2  |  Page : 37-40

Neonatal candidemia: Clinical importance of species identification


Department of Microbiology, Sri Aurovindo Medical Collage and Hospital, Indore, Madhya Pradesh, India

Date of Web Publication25-Feb-2015

Correspondence Address:
Gunjan Shrivastava
Department of Microbiology, Sri Aurovindo Medical Collage and Hospital, MR-10 Crossing, Indore-Ujjain Road, Indore - 453 331, Madhya Pradesh
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/2148-7731.152115

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  Abstract 

Context: This study was undertaken considering the recent increase in infections caused by non-albicans Candida (NAC) species around the world. Candidemia is a major cause of nosocomial morbidity and mortality in neonates. Although Candida albicans remains the most common fungal isolate from blood, longitudinal studies have detected a trend toward an increased prevalence of NAC species. There are multiple risk factors like neonatal birth weights less than 1250 g, indwelling intravascular catheters and admission in the ICU that are responsible for the emergence of neonatal candidemia in recent years. Aims: To study the changing pattern and importance of species identification of Candida. Settings and Design: This is a three-year retrospective study. Materials and Methods: The neonates born or admitted during Jan. 2010-Dec. 2012 were included in the study. A total of 69 neonates with candidemia as evidenced by positive blood cultures were considered. All blood samples were collected aseptically and were processed by standard procedures. Statistical analysis used: No. Results: During the study period, a total of 922 samples were collected. Out of the 922 samples, 69 were found to be positive for candidemia. Out of the 69, 10 [14.4%] were identified as Candida albicans while the remaining 59 [85.5%] were identified as NAC species. Among the NAC species, 29/59 (49.1%) were Candida tropicalis, 26/59 (44.06%) were Candida krusei while 04/59 (6.7% were Candida glabrata). Conclusions: Candidemia due to NAC species increased morbidity, mortality and complications. In our study, we found the changing pattern of Candida species and importance of species identification in cases of neonatal candidemia. Species identification is important because NACs are resistant to azole drugs.

Keywords: Bloodstream infections, candidemia, non-albicans Candida


How to cite this article:
Shrivastava G, Bajpai T, Bhatambare GS, Chitnis V, Deshmukh AB. Neonatal candidemia: Clinical importance of species identification. Sifa Med J 2015;2:37-40

How to cite this URL:
Shrivastava G, Bajpai T, Bhatambare GS, Chitnis V, Deshmukh AB. Neonatal candidemia: Clinical importance of species identification. Sifa Med J [serial online] 2015 [cited 2019 Jan 21];2:37-40. Available from: http://www.imjsu.org/text.asp?2015/2/2/37/152115


  Introduction Top


Candida species is one of the most common causes of blood stream infections among neonates and account for 9-13% of such infections. Although Candida albicans remains the most common fungal agent from neonatal candidemia, many studies detected a shift toward non-albicans Candida (NAC) species. [1] Candidemia is a significant cause of mortality and morbidity in neonates. [2] The genus Candida encompasses more than 150 species, only a few of which cause disease in humans. With rare exceptions, the human pathogens are Candida albicans, Candida guilliermondii, Candida krusei, Candida parapsilosis, Candida tropicalis, Candida kefyr, Candida lusitaniae, Candida dubliniensis, and Candida glabrata.[3],[4] These organisms are found on inanimate objects, in foods, and on animals, and are normal commensals of humans. They inhabit the gastrointestinal tract (including the mouth and oropharynx), the female genital tract, and the skin in humans. The introduction of antifungal agents, the causes of Candida infections shifted from an almost complete dominance of Candida albicans to the common involvement of Candida glabrata and the other species listed above. [1],[5] The NAC species now account for approximately half of all cases of candidemia and hematogenously disseminated candidiasis. Recognition of this change is clinically important, since the various species differ in susceptibility to the newer antifungal agents. In developed countries, where medical therapeutics are commonly used, Candida species are now among the most common nosocomial pathogens. [6] There are multiple risk factors that are responsible for neonatal candidemia-like preterm such as low birth weight <1500 g and infection through vertical transmission from maternal flora or via horizontal transmission from hands of health care workers. [7],[8]


  Materials and Methods Top


The present retrospective study was carried out in the department of Microbiology of a multi-super specialty tertiary health care center located in the Central India region where patients are expected from different parts of Central India. A total of 922 peripheral venous blood samples [9] from neonates suspected of septicemia were collected aseptically and prior to antibiotic therapy during the period from January 2010 to December 2012. Blood culture was performed by automated Bact/Alert 3D system [Biomerieux]. The Bact/Alert R is a growth-based technology and works on the principle that as microorganisms grown, they produce CO 2 ; these systems use colorimetric detection of CO 2 production from the growth of organism. It is a qualitative procedure for enhanced recovery and detection of aerobic and facultative anaerobic microorganism (bacteria and fungi) from normally sterile body fluids, including blood. The culture bottles used in this system were aseptically inoculated with 2 ml of venous blood. The blood culture bottles that were indicated as positive were subcultured onto Blood agar and MacConkey agar media. [10] Candida species identification was based on cultural characteristics, Gram stain and assessment by Germ tube test. [10] Speciation of all isolates was done by chromogenic media [HiChrome, Hi Media Mumbai, Pvt. Ltd]. [11] Strict quality control was followed during the entire study period. The procedure followed was in accordance with the ethical standards of the responsible committee.


  Results Top


During the study period, a total of 922 samples were collected. Out of the 922 samples tested, 69 were found to be positive for candidemia. Out of the 69, 10 [14.4%] were identified as Candida albicans while the remaining 59 [85.5%] were identified as NAC species [Table 1] and [Figure 1]. Among the NAC species, 29/59 (49.1%) were Candida tropicalis, 26/59 (44.06%) were Candida krusei while 04/59 (6.7%) were Candida glabrata [Table 1] and [Figure 1].
Figure 1: Distribution of non-albicans Candida


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Table 1: Distribution of non-albicans Candida


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  Discussion Top


In the present study, 69 [7.48%] neonates were diagnosed with bloodstream infections due to Candida species indicating a common cause of nosocomial bloodstream infection. This may be due to combination of various risk factors known to be strongly associated with the development of candidemia. These are wide use of broad spectrum antibiotics, increased low birth weight deliveries and length of stay in the hospital. [12],[13],[14] Our results were found to be comparable with the result [8.1%] of the study conducted in Rohtak, North India [Goel et al]. [15]

It was found that 59 [85.5%] infections were due to NAC species, while 10 [14.5%] infections were due to Candida albicans. [16] Though during the last few decades, Candida albicans was the predominant species causing blood stream infections, our results are comparable with the present day trends where increasing rates of NAC have been reported by various workers from different regions of India. The results are also comparable to the ARTEMIS Antifungal Surveillance studies carried out over the period of six and a half years in 127 medical centers in 39 countries that has noted a decreasing trend in the isolation of Candida albicans and an increase in the prevalence of NAC species [Pfaller et al]. [17],[18]

The prevalence of Candida glabrata among those causing human disease has increased significantly (Von-Zepelin et al. 1999, Pfaller and Diekema 2002), becoming the important cause of candidemia. It is interesting that Candida dubliniensis may develop resistance to fluconazole and this may possible have contributed to the emergency of the species in HIV carriers/AIDS patients. (Sullivan et al.). Besides, involvement of Candida krusei in pathological process has increased in the last few years. So, considering its resistance to fluconazole, it is widely used as an anti-mycotic prophylactic drug. In fact, a comparison between the incidence of disseminated Candida krusei in 1989 and 1990, the year in which fluconazole prophylaxis was introduced, showed that the latter practice led to an increase of such cases while no change was observed for Candida albicans and Candida tropicalis cases. Indeed Candida krusei became an important cause and it is difficult to treat cases of candidemia (Pfaller 2003). Nosocomial infection was connected with the presence of Candida parapsilosis on hospital equipment, personnel hands and infection of high-risk patients connected with such contamination.

In our study, Candida tropicalis was found to be the commonest agent of Candida bloodstream infection followed by Candida krusei. While two other studies also reported Candida tropicalis in neonatal candidemia, [19],[20] our study is comparable to the epidemiological studies carried out in different parts of our country indicating Candida tropicalis as the common cause of nosocomial candidemia. [21],[22],[23] Candida tropicalis is the second or third leading cause of candidemia. Candida tropicalis as a cause of fungemia in neonatal intensive care units have been linked to the presence of the fungus on the hands of the hospital personnel. Once introduced into a host with an impaired immune system, Candida tropicalis may be more virulent than Candida albicans and proceed from colonization to invasion more easily. A very low birth weight infant with an immature immune system may behave like an immunocompromised adult patient in this regard. [14] Several studies have shown that rates of fungal colonization among very low birth weight neonates vary greatly, with Candida albicans and Candida parapsilosis being the most prevalent species. [24] We found a relatively high incidence of Candida tropicalis colonization. In addition to endogenous infections, which are the most common, cause of fungemia in a neonatal intensive care unit have been connected to the presence of fungus on the hand of personnel. Increased prevalence of Candida krusei and emergence of Candida glabrata can be attributed to their innate resistance or indirectly due to the selective pressure resulting from its resistance to Azole drugs. [25],[26] Candida glabrata that is found to be the predominant species in many countries, including United States [18] but less common in Asia-Pacific regions and Latin America, has started emerging in the Indian subcontinents. This finding has major clinical implications as the higher complication and mortality rate associated with the NAC species. Candida tropicalis appears to be more virulent than Candida albicans in patients with hematological malignancies, and disseminated infection is associated with high mortality rates. [27],[28] Neonatal candidemia is generally associated with high mortality. In the present study, mortality rate (39.85%) is quite high. The change in the pattern of candidemia might be partly attributed to the increase in the number of immunocompromised hosts, low birth weight and prematurity, and widespread use of prophylactic or empiric antifungal therapy. This is an ominous sign given the in vitro resistance of the NAC species to currently available antifungal agents, specifically to azole derivatives.

The present study emphasizes the clinical importance and mycological shift of Candida species in neonatal candidemia with predominance of NAC species in the Central India region. The emergence of new species of Candida as potential pathogens is a reflection of the changing scenario in medicine since the 1960s. [24] The emergence of NAC species in causing candidemia could be due to the frequent hand carriage of Candida species in hospital personnel and antifungal drug pressure. [12] Hence speciation of Candida in neonatal candidemia can reduce morbidity, mortality and antifungal drug pressure in the neonates.


  Acknowledgement Top


The authors wish to thank the Chairperson and Dean of the institute for providing laboratory facilities and healthy working atmosphere during the study period. The authors are also thankful to the technical staff of the institute for providing necessary helping hand during the endeavour.

 
  References Top

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