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Garcia-Bustos, V. The Genus Candida auris. Encyclopedia. Available online: (accessed on 16 June 2024).
Garcia-Bustos V. The Genus Candida auris. Encyclopedia. Available at: Accessed June 16, 2024.
Garcia-Bustos, Víctor. "The Genus Candida auris" Encyclopedia, (accessed June 16, 2024).
Garcia-Bustos, V. (2021, November 16). The Genus Candida auris. In Encyclopedia.
Garcia-Bustos, Víctor. "The Genus Candida auris." Encyclopedia. Web. 16 November, 2021.
The Genus Candida auris

C. auris has unprecedently emerged as a multi-drug resistant fungal pathogen considered a serious global threat due to its potential to cause nosocomial outbreaks and deep-seated infections with staggering transmissibility and mortality, that has put in check the health authorities and institutions worldwide for more than a decade now. Due to its unique features not observed in other yeasts, it has been categorized as an urgent threat by the Centers for Disease Control and Prevention and the rest of international agencies. Moreover, epidemiological alerts have been released in view of the increase of healthcare-associated C. auris outbreaks in the context of the COVID-19 pandemic. This review summarizes the current evidence on C. auris since its first description, from virulence to treatment and outbreak control, and highlights the knowledge gaps and future directions for research efforts. 

Candida auris candidaemia virulence pathogenesis Resistance Treatment

1. Introduction

Candida auris is an emergent species which, as a consequence of its multidrug resistance to common antifungals [1][2][3], difficult identification with conventional biochemical microbiological techniques [4][5], high transmissibility, surface survival [6], and environmental adaptability [7][8], has been associated with serious nosocomial IFI with high mortality and is extremely difficult control in many countries [2][7][9][10][11].

2. Importance and Chronology of C. auris Emergence

C. auris was first isolated in the ear of a Japanese patient with external otitis in 2009 [12]. Since then, hospital outbreaks and IFI caused by this species have been described in more than 40 countries in the five populated continents, creating a global health problem. Due to its high multidrug resistance, transmissibility, ability to indefinitely colonise patients, and long persistence in the hospital environments, it has alerted the health authorities and health organisations of America and Europe.
In June 2016, the CDC communicated an extraordinary clinical alert, warning U.S. health institutions of the global emergence of C. auris and its capacity to cause serious IFI outbreaks in U.S. health centres [13]. Only one week after this CDC warning, Public Health England announced the isolation of this pathogenic fungus in hospitals in the United Kingdom, and reported a non-controlled outbreak of nosocomial candidaemia in the Royal Brompton Hospital in London [14], which preceded the notification in Spain of the largest European outbreak in Valencia, in the University and Polytechnic Hospital La Fe.
In October of that same year, the Pan American Health Organization (PAHO/WHO) also issued warnings about C. auris, and issued a new epidemiological alert about the risk of new nosocomial outbreaks in Latin America, recommending that Member States build capacity for early detection and effective reporting to prevent and control its spread in health services [15]. At the end of December 2016, when the nosocomial outbreaks in London and Valencia affected almost 100 patients, the European Centre for Disease Prevention and Control (ECDC) warned of the emergence of C. auris in Europe, and published a Rapid Risk Assessment update, appraising the risk for its spread in hospitals in European Union and European Economic Area (EU/EEA) countries [13].
Since then, the frequency of notifications of IFI due to C. auris has been increasing worldwide. In 2019, in the Report on Urgent Threats from the CDC, C. auris was again categorised as one of the main urgent threats, together with carbapenem-resistant Acinetobacter baumanii and Enterobacteriaceae, Clostridioides difficile, and Neisseria gonorrhoeae, with priority over other well-known resistant pathogens such as Enterobacteriaceae with extended-spectrum beta-lactamase (ESBL) production, methicillin-resistant Staphylococcus aureus (MRSA), and multidrug resistant Pseudomonas aeruginosa [16].
Recently, the use of personal protective equipment (PPE) in the SARS-CoV-2 pandemic has not helped to control C. auris transmission. In fact, many C. auris outbreaks have been described in COVID-19 units, both in critically ill units and conventional hospital wards. Until now, outbreaks have been identified in the USA [17][18], Italy [19], Colombia [20], India [21], Mexico [22], Lebanon [23], Brazil [24], and Spain [25].
Due to its nosocomial transmission and its ability to easily colonise the hospital environment, the SARS-CoV-2 pandemic has created an ideal atmosphere for C. auris dissemination. The hospital saturation, the equipment used, and the decreased efficacy of microbiology prevention systems are some of the main reasons for the increased C. auris spread during the actual SARS-CoV-2 pandemic, especially in developing countries [26].

3. Hypotheses on the Origin of C. auris

Since its first isolation in Japan almost a decade ago [12], one of the most enigmatic traits of C. auris has been the almost simultaneous and independent emergence of isolates of different clonality, as demonstrated by whole genome sequencing (WGS) studies [10]. Despite C. auris being detected retrospectively in several cases both from colonization and invasive samples, mainly in South Korea, the absence of this yeast in collections going back several decades was not due to identification problems [27]. After the first reports of cases of invasive infection in patients from Asia, Africa, and South America with strains belonging to phylogenetically different clades [10][28][29][30][31], C. auris began to be considered a pathogen of medical importance in humans. However, the mechanisms underlying the appearance of highly virulent and resistant strains in geographically distant regions without phylogenetic traceability since the first descriptions in the literature are still unknown.
The indiscriminate use of antifungal agents both in clinical practice and agro-industry has been proposed to contribute to the emergence of C. auris, and may partially explain its high degree of drug resistance [2]. Nevertheless, this hypothesis hardly justifies its appearance as a virulent human pathogen on three continents almost simultaneously [32], nor does its significant pathogenicity both in humans and in other animal experimental models [2][7][9][10][11][33][34].
Another suggested explanation for the emergence of C. auris and for its unusual characteristics has been the recent and progressive acquisition of virulence factors [33]. But, similarly, it is unlikely that these determinants of pathogenicity have been acquired nearly simultaneously in separated remote regions under different environmental and genetically distant isolates [32][35].
Recently, global warming has been postulated as a feasible explanation for this unknown [32][35][36]. Of the large number of fungal species described in our planet, only a minority are human pathogens, mainly due to the high basal body temperature of mammals, which created a thermal restriction barrier, as well as the complex mechanisms of innate and adaptive immunity against fungal infection [37][38].
Casadevall et al. compared thermal sensitivity of C. auris with other closely phylogenetically related Candida species, and demonstrated its relatively high thermotolerance [32]. Hence, it was hypothesised that C. auris could have overcome the thermal barrier of mammals, as a result of its adaptation to global warming and higher temperatures from an environmental reservoir, possibly in wetlands or coastal ecosystems. Later, it could have been transported by migratory animals such as birds to other areas of the planet where, after interspecific transmission in rural areas, human colonization and its subsequence appearance in healthcare facilities could take place. The recent environmental isolation of C. auris in tropical remote beaches of the Andaman Islands (India) [39] confirms for the first time the presence of an environmental niche and supports the global warming hypothesis in the emergence of C. auris.

4. Microbiological Features of C. auris

4.1. Phylogeny

C. auris is an ascomycete fungus within the clade Clavispora of the family Metschnikowiaceae and Saccharomycetales Order [40][41]. Although the evolutionary phylogenetic relationship of C. auris with other Candida species is not yet fully clarified due to the infrequency of some of the closest species, 5 clades have been described so far. These clades have been related to other species such as such as C. haemulonii, closely followed by C. pseudohaemulonii, and C. dobushaemulonii with 88% similarity [40][42], and recently, C. heveicola [12].
Due to the relative taxonomic proximity of these species, C. auris shares some of their phenotypic characteristics, preventing an adequate identification based on conventional biochemical methods [43].
Whilst clades I, III and IV are responsible for outbreaks of invasive infection by multidrug resistant strains, the clade II located geographically in east Asia has not been associated with nosocomial outbreaks. It presents a more benign antifungal drug susceptibility profile, a markedly different karyotype from the rest, and has been fundamentally described in ear infections, as it was at the time of its discovery [12][44][45]. Clade V, recently described in Iran [30], is highly infrequent, and owns a high degree of phylogenetic proximity with clades I, III and IV, although its sequence is relatively divergent from the rest [44]. Each of these clades presents isolates of the same clonality, restricted to a specific geographical area, but which historically emerged in a relatively simultaneous and independent manner [8], as previously discussed.
Clade I has been described mainly in regions of the United Kingdom, India, and Pakistan. Clade II is found mostly in Japan and South Korea. Clade III is native to South Africa, and also includes samples from Spanish outbreaks, while clade IV constitutes that described in Venezuela. Finally, clade V has been described in Iran, with a single isolate from a patient who never left the country [12][8][10][11][40][44][45][46].

4.2. Culture, Growth, and Phenotypes

C. auris is able to grow after 24 h of culture at 37 °C on Sabouraud agar, where it develops opaque white to creamy colonies. Chromogenic media have recently become popular for C. auris culture and identification. In the medium CHROMagar Candida®, colonies present with pink to pale purple tonalities. However, differences in the tone of the colonies have been reported, dependent on the country of origin and clade. Some authors have, hence, proposed these chromogenic media complemented with Pal agar (with extract of sunflower seeds) for presumptive identification of C. auris [47].
Although it is not able to grow in media with cycloheximide, C. auris presents a marked thermotolerance and salt tolerance, growing in a temperature range from 37–42 °C, unlike other Candida or fungal species [6][11][32][34][40][48][49][50][51]. These particular traits, beyond modified chromogenic media, can also be used for its presumptive identification in microbiology laboratories with technical limitations or before definite molecular identification.
C. auris assimilates and weakly ferments glucose, saccharose, and trehalose; and assimilates raffinose, melezitose, soluble starch, and ribitol or adonitol. However, it is not capable of fermenting galactose, maltose, lactose, or raffinose [12]. This glycidic fermentation and assimilation profile also makes it possible to generate sensitive and specific culture media based on mannitol, dextrose, and dulcitol to isolate and presumptively identify C. auris in clinical practice [6].
Microscopically, C. auris is a yeast with 2–3 × 2.5–5 μm ovoid cells similar to C. glabrata [34]. It presents two important clearly distinguishable phenotypes with different behaviour and virulence [34][52][53][54][55][56][57][58][59][60]:
  • Non-aggregative phenotype: yeast cells arrange as isolated or, sometimes, coupled cells, similarly to other Candida species.
  • Aggregative phenotype: some isolates keep daughter cells attached after budding, creating large aggregates that cannot be separated by physical disruption after vigorous vortexing for several minutes.
The different characteristics in behaviour, virulence, and pathogenicity determinants of both phenotypes will be posteriorly discussed.
Unlike other species of the genus Candida, such as C. albicans, considered the most virulent species of the group, and with high filamentation capacity [61][62][63], C. auris is not considered able to develop true hyphae, chlamydospores, or germ tubes [15][27][49][64][65]. The formation of very rudimentary pseudohyphae had only been described occasionally [34][53]. However, more recent studies have reported filamentation in some strains of C. auris under certain environmental conditions or stress [52][62][66][67]. Yue et al. described an in vivo inheritable phenotypic change or switch towards a filamentous or filamentation-competent phenotype, induced by passage through the mammalian organism, different salt concentrations of NaCl between 10% and 26%, and thermal changes [66]. Our group recently described filamentation in non-aggregative and aggregative strains in an invertebrate model in wax moth larvae at 37 °C [52]. On the other hand, Bravo-Ruiz et al. were able to induce filamentation in vitro through genotoxic stimulation [67]. This possibility of pseudohyphae formation has finally been demonstrated in strains from the four main clades, according to the work of Fan et al. [68].

4.3. Difficulties in C. auris Identification

There are numerous methods used for the identification of Candida species in clinical microbiology laboratories. Nevertheless, most of them use commercial systems of biochemical characterization, which are unable to properly identify C. auris. These methods usually misidentify it as C. haemulonii, Rhodotorula glutinis, Saccharomyces cerevisiae, or, less frequently, as other Candida species such as C. famata, C. dobushaemulonii, C. sake, C. lusitaniae, C. albicans, C. guilliermondii, or C. parapsilosis [8][9][34][43][48][49][64][69][70][71][72][73][74]. However, erroneous identification has been reported with more complex diagnostic methods, such as filmarray systems [75] and matrix-assisted laser desorption/ionisation time-of-flight (MALDI-TOF) [76]. The main misidentified species of different commercial biochemical systems is represented in Figure 1.
Figure 1. Main misidentified species of different commercial biochemical systems. Misidentification of C. auris by means of the VITEK systems has specially been reported with isolates of the east Asian and African clades.
In primary or secondary hospitals with fewer resources, as well as in developing countries with limited access to sophisticated and expensive methods such as MALDI-TOF or molecular techniques, such identification sometimes arrives at Candida spp. without reaching the species level in non-invasive samples [10][77]. However, due to its relevance for public health, accurate and rapid diagnostic methods are needed to facilitate prompt diagnosis, effective patient management, and control of nosocomial outbreaks.
At present, the new MALDI-TOF systems, after including the specific spectra in the databases [78][79][80], are able to provide specific diagnoses at species level. In developing countries with limited access, this method could be replaced by DNA detection techniques such as PCR [80]. Despite the sequencing of genetic loci (RPB1, RPB2, D1/D2) and the internal transcribed spacer (ITS) of ribosomal RNA (rRNA) being commonly used, especially in reference centres [49][65][81], different PCR endpoint trials, multiplex PCR [82], or PCR of Restriction Fragment Length Polymorphisms (RFLP) [80][83] could be more accessible in centres with economic or equipment limitations. Recently, two commercially available PCR assays, AurisID (OLM, Newcastle Upon Tyne, UK) and Fungiplex Candida Auris RUO Real-Time PCR (Bruker, Bremen, Germany) have been shown to reliably identify C. auris, even at low DNA concentrations [84].
In addition, many microbiology laboratories presumptively identify C. auris using chromogenic media, due to better accessibility and lower cost. Consequently, some media which allow for rapid screening after 24 h of incubation have been created, such as HiCrome C. auris [85]. Furthermore, the culture medium CHROMagar Candida, complemented with Pal agar [47], has been shown to be useful in the differentiation of C. auris from C. haemulonii. Due to its triazole resistance, the use of high concentration fluconazole as media supplementation could optimise the presumptive recognition of C. auris in higher prevalence zones which lack easy access to definitive identification techniques [86].

4.4. Virulence

Since C. auris became a major public health problem, efforts have been devoted to investigating the pathogenicity degree of several clones, strains, and worldwide isolates of C. auris. Nevertheless, data on its virulence compared to other Candida species, as well as on its phenotypical, morphological, or molecular pathogenicity determinants, are still limited.
C. albicans is considered the most virulent species of the Candida genus [61][62][87]. Candida species express several pathogenicity factors that contribute to their pathogenicity and virulence within the host. Among them, it is important to highlight the synthesis of molecules such as phospholipases, aspartic-proteases, or molecules related to the recognition of host proteins that increase tissue adhesins, and morphogenesis, as well as a phenotypic switch to a filamentous phenotype, enabling higher adaptability to intrahost changes [87].
Despite C. auris initially being considered unable to filament in vivo or, in any case, only able to produce rudimentary pseudohyphae under stress [66][67], some works using strains from different origins and clones have described an in vivo virulence similar or even greater than that of C. albicans [34][53][88]. Nonetheless, the results of the few studies on the pathogenicity of C. auris are relatively diverse, as seen in Table 1 [34][52][53][54][55][56][88]. Differences have been noted, not only in comparison with other species of the genus, but also regarding different clones, strains, and individual isolates. Further studies are, hence, needed, using a larger number of strains from different geographical regions, clinical isolates, and clades [41][52][56][89].
Table 1. Virulence of C. auris in different experimental animal models.
Organism Virulence Results Reference
C. elegans C. hameulonii < C. auris = C. albicans [90]
C. elegans Non-Ag C. auris > Ag-C. auris [58]
D. rerio C. auris > C. albicans > C. haemulonii [88]
D. melanogaster C. auris > C. albicans
Non-Ag C. auris = Ag C. auris > C. albicans
G. mellonella C. albicans > C. auris > C. parapsilosis
Non-Ag C. auris > Ag-C. auris
Non-invasive isolates = invasive isolates
G. mellonella C. auris ≥ C. albicans
Non-Ag C. auris > Ag-C. auris
G. mellonella Non-Ag C. auris ≥ C. albicans and C. glabrata
Ag-C. auris = C. glabrata
G. mellonella C. auris < C. albicans
Non-ag C. auris = Ag C. auris
G. mellonella C. auris < C. albicans
Non-ag C. auris = Ag C. auris
G. mellonella C. albicans > C. auris > C. haemulonii [55]
G. mellonella Non-Ag C. auris > Ag-C. auris
Blood isolates > respiratory and urine isolates
Neutropenic Mus musculus C. auris = C. haemulonii [55]
Non-ag: non aggregative; Ag: aggregative.
During the last several years, several research groups have analysed the pathogenicity differences of C. auris in comparison to other Candida species. Different models have been used: from in vitro studies assessing different transcriptional profiles from strains with different phenotypes [92], to animal models with a diverse complexity. These include invertebrate models in Caenorrhabditis elegans [58][90], Drosophila melanogaster [91], and the recently popularised model in wax moth larvae, Galleria mellonella [34][52][53][54][55][56][57][58], as well as vertebrates such as the traditional murine model [55], and, more recently, the zebrafish Danio rerio [88].
G. mellonela has recently gained importance in the study of fungal pathogenesis and, especially, Candida spp. virulence. Owing to the functional and structural similarity of the larval innate immune system to that of mammals, its low cost, as well as the possibility of working with larger samples in short timeframes thanks to its short vital cycle and, importantly, due to the lack of ethical implications involved, its popularity has been increasing recently [52][62][93][94][95][96][97][98].
The first data of experimental pathogenicity of C. auris came from the studies of Borman et al. [34], using 12 isolates from the United Kingdom outbreak. They showed more aggregative phenotypes of C. auris to be in vivo than non-aggregative strains. Moreover, the first were considered almost as virulent as C. albicans, despite their striking inability to filament. In addition, Sherry et al. [53], who also used four different strains from the United Kingdom, documented that non-aggregative phenotypes of C. auris showed a higher lethality than C. albicans reference strain SC5314, using a standardised inoculum of 105 colony forming units (CFU), while C. glabrata and aggregative C. auris were significatively less virulent. In a model of C. elegans using 37 C. auris strains from Venezuela [99], they also appeared to show a similar pathogenicity degree to C. albicans, but less virulence than C. haemulonii [90]. However, these results could not be reproduced using strains of other geographical origins.
The works of Carvajal et al. [57] and Muñoz et al. [55] analysed the differential pathogenicity using Colombian strains. The study of the first group in G. mellonella did not show significative differences in the virulence of aggregative and non-aggregative strains, with more than 50% of the strains being less lethal than the reference strain of C. albicans SC5314; these findings are similar to the results obtained by Romera et al. [54] with Spanish isolates, also in G. mellonella. The second group developed both a G. mellonella and a neutropenic murine model, and used C. albicans SC5314 and ATCC10231 strains as a high pathogenicity control, and C. haemulonii as a low virulence control. Despite C. auris phenotypes not being determined, the four strains used showed a significant intermediate lethality between C. albicans and C. haemoulonii in G. mellonella, as reported by Garcia-Bustos et al. [52], but these results were not replicated in the murine model.
Therefore, this heterogenicity in intra- and interspecific virulence advocates for the hypothesis that the morphogenetic variability is an inherent trait of C. auris, and an indicator of its flexibility and adaptability to different environments and stimuli [52], particularly after some authors induced aggregation after exposition to triazoles and echinocandins [100].
This potential ability to phenotypically switch may result from a survival mechanism outside of the host. In fact, isolates from environmental and epidemiological surveillance samples more frequently presented an aggregative phenotype. Moreover, they demonstrated a greater ability to form biofilm structures; both traits related to the difficulty for their definitive eradication in the health environment and in colonised patients [101][102]. In addition, replicative aging resulting from asymmetric cell division has been shown to cause further phenotypic differences, and older C. auris cells have been associated with increased virulence in G. mellonella [103].
The pathogenicity determinants of C. auris are not completely clarified. The formation of biofilms and filamentation constitute two of the main virulence factors of Candida species. Other important factors have been described, such as phenotypic switch, metabolic flexibility and adaptation to different pH, production of extracellular hydrolytic and cytolytic toxins, heat shock proteins (HSP), and development of adherence and recognition mechanisms of surfaces and host cells [104][105].
As previously stated, C. auris is able to filament both in vivo and in vitro [52][66][67][68]. However, the pathogenic implication of hyphae or pseudohyphae formation in C. auris is still unknown. Some studies have not been able to demonstrate the expression of proteins related to the formation of these structures, such as the candidalysin (ECE1) or hyphal cell wall protein (HWP1) in certain C. auris strains [40]. Yue et al. [66] analysed the expression profile of genes related to the regulation of filamentation, and discovered similarities with C. albicans, showing an increased expression of genes implicated in hyphae formation such as HGC1, ALS4, COH1, FLO8, PGA31, and PGA45 in filamentous strains, with regard to strains that only showed yeast-form structures.
C. auris is able to form biofilms, a trait which also constitutes a major challenge in clinical practice. The colonization of surfaces in patients undergoing any type of instrumentalisation increases, on the one hand, the risk of invasive candidiasis and generating new outbreaks, and decreases, on the other hand, the possibility of eradicating patient colonisation. A large number of IFI cases due to C. auris have been described related to health devices, such as urinary tract infections (UTI) in patients with indwelling catheters, cardiovascular infections, or neurosurgical instrument-related infections [7][8][9][106][107]. The C. auris tendency to form biofilms in human skin as well as in animal skin models with an elevated microbiological burden [108] has been related to an increased expression of adhesins (IFF4, CSA1, PGA26, PGA52, PGA7, HYR3, and ALS5) [109], with differential regulation based on the biofilm maturity [109][110]. In addition, biofilms also influence drug resistance by physical means, by hindering drug penetration in the most isolated regions of the dense biofilms [109][111], and expressing genes related to biofilm with added efflux pump action or glucan modifier enzyme action [109][111][112].
Some genomic studies have demonstrated that C. auris shares some of the pathogenicity determinants with other species of Candida, such as secretion of aspartic-proteases (SAP), lipases, phospholipases, and YPS proteases [58][60]. Other virulence factors include the expression of oxidoreductases, transferases, hydrolases [58], and haemolysins [113].
Finally, immune evasion has recently been considered an important trait of C. auris. Beyond phenotypic plasticity, some works have reported the ability of this fungus to evade neutrophil attack and effective phagocytosis both in human and animal models [108][114]. This finding is in line with previous clinical works, suggesting that neutropenia is not an important risk factor for invasive candidiasis by C. auris [52].


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