Epidemiology, Species Distribution, and Outcome of Nosocomial Candida spp. Bloodstream Infection in Shanghai — An 11-year Retrospective Analysis in a Tertiary Care Hospital

doi:10.21203/rs.3.rs-212048/v1

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Epidemiology, Species Distribution, and Outcome of Nosocomial Candida spp. Bloodstream Infection in Shanghai — An 11-year Retrospective Analysis in a Tertiary Care Hospital

https://doi.org/10.21203/rs.3.rs-212048/v1

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Background

The incidence of Candida bloodstream infections (BSIs), has increased over time. In this study, we aimed to describe the current epidemiology of Candida BSI in a large tertiary care hospital in Shanghai and to determine the risk factors of 28-day mortality and the impact of antifungal therapy on clinical outcomes.

Methods

All consecutive adult inpatients with Candida BSI at Ruijin Hospital from 2008.1 to 2018.12 were enrolled. Underlying diseases, clinical severity, species distribution, antifungal therapy, and their impact on the outcomes were analyzed.

Results

Among the 370 inpatients with 393 consecutive episodes of Candida BSI, the incidence of nosocomial Candida BSI was 0.39 episodes/1000 hospitalized patients. Of the 393 cases, 299 (76.1%) were treated with antifungal therapy (247 and 52 were treated with early appropriate and targeted antifungal therapy, respectively). The overall 28-day mortality rate was 28.5%, which was significantly lower in those who received early appropriate (25.5%) or targeted (23.1%) antifungal therapy than in those who did not (39.4%; P=0.012 and P=0.046, respectively). In multivariate Cox regression analysis, age, chronic renal failure, mechanical ventilation, and neutropenia were found to be independent risk factors of 28-day mortality rate. Patients who received antifungal therapy had a lower mortality risk than did those who did not.

Conclusions

The incidence of Candida BSI has increased steadily in the past 11 years at our tertiary care hospital in Shanghai. Antifungal therapy influenced short-term survival, but no significant difference in mortality was observed between those who received early appropriate and targeted antifungal therapy.

General Microbiology

Infectious Diseases

Candida spp.

Bloodstream infection

Epidemiology

Species distribution

Antifungal therapy

Early treatment.

The incidence of invasive fungal infection has increased over time, especially for Candida bloodstream infections (BSIs), which is associated with considerable excess mortality and costs [1-3]. In the past two decades, the incidence of fungal infection has increased from 0.1 episodes/1000 admissions to 0.3-0.6 episodes/1000 admissions in China, North America, and some European countries [4-7]. The mortality rate ranges from 35%-53% [8-11]. The optimal management of Candida BSIs included early awareness of patients at risk, control of the infection source, and timely administration of appropriate antifungal agents [12, 13].Consequently, antifungal agents have been widely used as empirical therapy. However, the overuse of antifungal agents results in increased costs, toxicity, and ecological selection pressure for antifungal resistance and adverse drug interactions. Several studies showed that delayed antifungal therapy (more than 48h from onset) is associated with higher mortality [14], whereas others have reported conflicting results [15-17].

In this study, we retrospectively analyzed data from all patients with Candida BSI at our hospital between 2008 and 2018, aiming to describe their clinical characteristics, species distribution, antifungal therapy and to determine the risk factors for 28-day mortality.

2.1 Study setting and population

A retrospective analysis of data on consecutive Candida BSI episodes in adult inpatients (≥18years) between January 1, 2008 and December 31, 2018, collected from the microbiology database of a 1900-bed teaching hospital in Shanghai, was performed.

Demographics and data on underlying diseases, comorbidities, severity of clinical features, Candida species distribution, and early appropriate or targeted antifungal treatment were compared among the patients with Candida BSI. Data on the initial and targeted antifungal agents used were also collected.

Candida BSI was defined as at least one positive blood culture for Candida. [18]. Neutropenia was defined as <500/mm³ absolute neutrophil count. Prior corticosteroid was defined as receiving >1 mg/kg/d prednisone for more than one week or equivalent before Candida BSI onset.

2.2 Laboratory methods

Isolates were detected from blood cultures using the BACTEC^TM FX system (Becton Dickinson, Inc., Sparks, MD, USA), identified using matrix-assisted laser desorption ionization-time of flight mass spectrometer (bioMérieux, Marcy-l’Étoile, France). Susceptibility testing for flucytosine, amphotericin B, fluconazole, voriconazole, and itraconazole was performed using the ATB® FUNGUS 3 system (BioMérieux, France), which is widely used in China [19]. This test provides information on susceptibility to antifungals agents, which is concordant with that obtained using the methodologies of the Clinical and Laboratory Standards Institute (CLSI) and European Committee on Antimicrobial Susceptibility Testing (EUCAST) [20].

Early appropriate antifungal treatment was defined as commencement of appropriate drug treatment at an adequate dosage before obtaining in vitro susceptibility test results. The adequate dosage of the antifungal agent was defined according to 2009 or 2016 Infectious Diseases Society of America (IDSA) guidelines [18, 21]. Targeted antifungal treatment was defined as commencement of appropriate targeted treatment after obtaining results from susceptibility testing, regardless of whether the antifungal treatment initiated was appropriate. Crude mortality was calculated from data on deaths registered 28 days after the occurrence of Candida BSI.

2.3 Statistical analysis

Descriptive and subgroup analyses were performed for the baseline characteristics, and continuous variables were expressed as mean ± standard deviation (SD) or median and interquartile range according to their distributions. The chi-square test or 2-tailed Fisher exact test was applied to categorical variables. To identify the risk factors for 28-day mortality, multivariate Cox regression analysis was performed, and adjusted hazard ratio (HRs) with 95% confidence intervals (CIs) were reported. Variables that were associated with 28-day mortality in the Cox univariate analyses with a P<0.05 were entered into the multivariate Cox regression analysis model based on the forward selection. Two-tailed tests of significance at the level of a P value <0.05 level was considered as significant. Statistical analysis was performed using IBM SPSS Statistics for Windows, version 22.0 (IBM Corp., Armonk, N.Y. USA).

2.4 Ethics

The study was approved by Ruijin Hospital, Shanghai Jiao Tong University, School of Medicine institutional review board, and written informed consent was not required because of the observationalature of this study.

3.1 Incidence and clinical features of Candida BSI episodes

Data on a total of 393 consecutive episodes of Candida BSI were collected from 370 inpatients during the 11-year study period. The demographic characteristics of the patients are summarized in Table 1. The mean age of the patients was 57.6±19.0 years, and 74.3% were male. Candida BSI incidence was 0.39 episodes/1000 admissions. The incidence increased steadily from 0.21 (2008), to 0.59 (2017), to 0.33 episodes per 1,000 admissions (2018) (Figure 1[A]). Among the 393 Candida BSI episodes, 148 (37.7%), 167 (42.5%), and 78 (19.8%) occurred in the surgical ward, intensive care units (ICUs), and internal medicine ward, respectively (Figure 1[B]).

C. albicans was isolated in 19.3%, 41.2% and 38.9%, of cases in internal medicine wards, surgery wards, and the ICU, respectively (P=0.003). A higher proportion of C. tropicalis (34.7%) was found in internal medicine wards than in the surgery wards (21.6%) and ICUs (21.6%).

Most patients with Candida BSI had at least one comorbidity. These included 118 (30%) with solid tumors, 48 (12.2%) had hematological malignancies, 77 (19.6%) had diabetes mellitus, 124 (31.6%) had chronic cardiac disease, 52 (13.2%) had chronic pulmonary disease, 42 (10.7%) had chronic renal failure, in 26 (6.6%) patients, the skin barrier was considered compromised, 244 (62.1%) had prior surgical intervention, 54 (13.7%) used corticosteroid, 88 (22.4%) used prior antifungal agents, and 255 (64.9%) received antibiotics prior Candida BSI onset. A total of 244 (72%) patients had at least two comorbidities. No patient had human immunodeficiency virus (HIV) infection. Regarding the severity, 309 (78.6%) had fever, 180 (45.8%) received parenteral nutrition, 147 (37.4%) received mechanical ventilation, 49 (12.5%) received renal replacement therapy, and 42 (10.7%) had neutropenia. The clinical characteristics of patients by Candida species are shown in Table 1.

Table 1

Demographic and clinical data for patients with *Candida* bloodstream infection
	*C. albicans*	*C. parapsilosis*	*C. tropicalis*	*C. glabrata*	*C. guilliermondii*	C. *sake*	C. *krusei*	Other Candida spp.	Total
	(n=141)	(n=87)	(n=69)	(n=48)	(n=20)	(n=8)	(n=5)	(n=15)	(n=393)
Age, y	65.2±14.5	53.2±20.3	50.5±19.5	60.7±17.5	50.5±19.4	52±20.6	40.8±27.1	52.6±20.0	57.6±19.0
Male	102(73.4)	60(69.0)	51(73.9)	44(91.7)	14(70)	8(100)	2(40)	11(73.3)	292(74.3)
Origin
Internal medicine ward	15(10.6)	19(21.8)	27(39.1)	7(14.6)	3(15)	0(0)	3(60)	4(26.7)	78(19.8)
Surgical ward	61(43.3)	32(36.8)	16(23.2)	15(31.3)	10(50)	6(75)	0(0)	8(53.3)	148(37.7)
ICU	65(46.1)	36(41.4)	26(37.7)	26(54.1)	7(35)	2(25)	2(40)	3(20)	167(42.5)
Time from admission to infection, d	30.6±35.3	48.4±56.2	37.7±32.4	27.5±19.1	35.9±52.5	120.6±242.7	64.2±68.6	21.5±13.6	37.6±53.1
Length of hospital stay, d	56.0±54.9	83.2±78.1	71.5±56.1	67.1±72.7	97.7±142.6	178.5±281.7	92.4±88.5	52.7±101.5	71.1±82.8
Turnaround Time, d	4.3±1.9	4.5±1.1	3.8±1.1	4.8±1.3	4.3±1.2	4.5±1.6	4.4±1.5	5.9±1.8	4.4±1.5
Underlying disease
Solid tumor	47(33.3)	26(29.9)	13(18.8)	17(35.4)	6(30)	2(25)	0(0)	7(46.7)	118(30)
Hematologic malignancy	8(5.7)	6(6.9)	24(34.8)	2(4.2)	2(10)	1(12.5)	3(60)	2(13.3)	48(12.2)
Diabetes mellitus	33(23.4)	21(24.1)	8(11.6)	9(18.8)	1(5)	1(12.5)	0(0)	4(26.7)	77(19.6)
Chronic cardiac disease	55(39)	22(25.3)	16(23.2)	18(37.5)	6(30)	3(37.5)	2(40)	2(13.3)	124(31.6)
Chronic pulmonary disease	26(18.4)	9(10.3)	5(7.2)	6(12.5)	1(5)	1(12.5)	1(20)	3(20)	52(13.2)
Chronic renal failure	18(12.8)	6(6.9)	6(8.7)	5(10.4)	5(25)	0(0)	0(0)	2(13.3)	42(10.7)
Skin barrier compromised	5(3.5)	9(10.3)	5(7.2)	1(2.1)	3(15)	3(37.5)	0(0)	0(0)	26(6.6)
Prior surgical intervention (<1 month)	97(68.8)	48(55.2)	36(52.2)	30(62.5)	15(75)	6(75)	2(40)	10(66.7)	244(62.1)
Corticosteroid use	11(7.8)	13(14.9)	12(17.4)	9(18.8)	4(20)	0(0)	3(60)	2(13.3)	54(13.7)
Prior use of antifungal agents (<6 months)	20(14.2)	19(21.8)	24(34.8)	11(22.9)	8(40)	1(12.5)	4(80)	1(6.7)	88(22.4)
Severity of clinical feature
Fever (T>38.2˚C)	114(80.9)	63(72.4)	60(87)	34(70.8)	16(80)	6(75)	3(60)	13(86.7)	309(78.6)
Parenteral nutrition	71(50.4)	42(48.3)	28(40.6)	23(47.9)	5(25)	3(37.5)	2(40)	6(40)	180(45.8)
Mechanical ventilation	58(41.1)	31(35.6)	23(33.3)	25(52.1)	5(25)	2(25)	2(40)	1(6.7)	147(37.4)
Renal replacement therapy	17(12.1)	10(11.5)	9(13)	7(14.6)	5(25)	0(0)	1(20)	0(0)	49(12.5)
Central venous catheter	121(85.8)	67(77)	49(71)	43(89.6)	17(85)	5(62.5)	4(80)	10(66.7)	316(80.4)
Neutropenia	4(2.8)	8(9.2)	22(31.9)	1(2.1)	2(10)	0(0)	3(60)	2(13.3)	42(10.7)
28-day mortality	54(38.3)	16(18.4)	19(27.5)	13(27.1)	3(15)	1(12.5)	1(20)	5(33.3)	112(28.5)
Other Candida spp. Includes C. gum (4 cases), C. lusitaniae (3 cases), C. intermedia (2 cases), C. lipolytica (2cases), C. theae (2 cases), C.famata (1case), and C. haemulonii (1 case). Data were expressed as mean ± SD for continuous variables and n (%) for categorical variables. ICU, intensive care unit; SD, standard deviation

3.2 Antifungal susceptibility of Candida isolates

A total of 393 Candida spp. were isolated, including 141 (35.9%), C. albicans, 87, C. parapsilosis (22.1%); 69, C. tropicalis (17.6%); 48, C. glabrata (12.2%); 20, C. guilliermondii (5.1%); 8, C. sake (2.0%); 5, C.krusei (1.3%); and 15, other species (4, C. gum; 3, C. lusitaniae; 2, C. intermedia; 2, C. theae; 2, C. lipolytica; 1, C. famata; and 1, C. haemulonii).

Among the 393 Candida species, 378 were subjected to antifungal susceptibility testing, on the basis of 2012 CLSI breakpoints (CBPs). As shown in Table 2, the susceptibility of C. albicans, C. parapsilosis to fluconazole and voriconazole were quite high, compared to that to itraconazole (94%, 93.3% vs. 82.1%). The susceptibility of C. tropicalis to triazoles fluconazole, voriconazole, and itraconazole was unsatisfactory. Amphotericin B and 5-flucytosine remained superior against common Candida spp., except for C. krusei and C. guilliermondii, with 95% susceptibility.

Table 2 *Antifungal susceptibility testing results (ATB Fungus 3) of 378 Candida* [n (%)]**
	C.albicans (n=134)	C.parapsilosis (n=86)	C.tropicalis (n=67)	C.glabrata (n=47)	C.krusei (n=5)	C.sake (n=8)	C.guilliermondii (n=19)	Other Candida spp. (n=12)	Total（n=378）
Fluconazole
S	126 (94)	77(89.5)	35 (52.2)	0 (0)	0 (0)	8(100)	13 (68.4)	9 (75.0)	268（70.9）
SDD	1 (0.8)	6 (7.0)	3 (4.5)	44(93.6)	0 (0)	0 (0)	0 (0)	0 (0)	54（14.3）
R	7 (5.2)	3 (3.5)	29 (43.3)	3 (6.4)	5 (100)	0 (0)	6 (31.6)	3 (25.0)	56（14.8）
Itraconazole
S	110 (82.1)	75 (87.2)	25 (37.3)	0 (0)	0 (0)	8 (100)	6 (31.6)	9 (75.0)	233（61.6）
SDD	6 (4.5)	7 (8.1）	4 (6.0)	40 (85.1)	2 (40.0)	0 (0)	7 (36.8)	0 (0)	66（17.5）
R	18 (13.4)	4 （4.7）	38 (56.7)	7 (14.9)	3 (60.0)	0 (0)	6 (31.6)	3 (25.0)	79（20.9）
Voriconazole
S	125 (93.3)	79 (91.9)	41 (61.2)	45 (95.8)	4 (80.0)	8 (100)	12 (63.2)	11 (91.7)	325（86.0）
SDD	0 (0)	2 (2.3)	2 (3.0)	1 (2.1)	1 (2.0)	0 (0)	3 (15.8)	0 (0)	9（2.4）
R	9 (6.7)	5 (5.8)	24 (35.8)	1 (2.1)	0 (0)	0 (0)	4 (21.0)	1 (8.3)	44（11.6）
Amphotericin B
S	133 (99.3)	83 (96.5)	67 (100)	47 (100)	5 (100)	8 (100)	18 (94.7)	11 (91.7)	372（98.4）
R	1 (0.7)	3 (3.5)	0 (0)	0 (0)	0 (0)	0 (0)	1 (5.3)	1 (8.3)	6（1.6）
Flucytosine
S	132 (98.5)	85 (98.8)	65 (97.0)	46 (97.9)	1 (20.0)	8 (100)	9 (47.4)	12 (100)	358（94.7）
R	2 (1.5)	1 (1.2)	2 (3.0)	1 (2.1)	4 (80.0)	0 (0)	10 (52.6）	0 (0)	20（5.3）
15 Candida spp. isolates did not have a susceptibility test, C. albicans (7), C. parapsilosis (2), C. tropicalis (2), and glabrata, theae, gum, haemulonii each. R, resistance; S, susceptible; SDD, susceptible dose dependence.

3.3 Antifungal therapy and outcome of patients with Candida BSI

Antifungal therapy was administered to 299 (76.1%) patients, whereas 94 (23.9%) patients did not receive antifungal therapy. Among those who received antifungal therapy, 247 (62.8%) received early appropriate antifungal therapy, and 52 (13.2%) received targeted antifungal therapy. Fluconazole was most frequently used as an empirical therapy, followed by echinocandins and voriconazole. Eighteen (4.6%) patients with Candida BSI received combination therapy.

The overall, 28-day mortality rate was 28.5%, and the rate was significantly higher in internal medicine wards and ICUs than in surgical wards (37.2% and 34.7% vs. 16.9%, respectively, P<0.001). The mortality rates among those who received early appropriate or targeted antifungal therapy was 26.8% and 25.1% (P=0.012 or P=0.046), compared to 39.3% for those who did not receive any antifungal therapy, with no significant difference between those who received early appropriate antifungal therapy and those who received targeted antifungal therapy.

On univariate analysis, age, solid tumor, diabetes mellitus, chronic cardiac disease, chronic renal failure, skin disease, prior surgical intervention, mechanical ventilation, neutropenia, and antifungal therapy were found to be associated with 28-day mortality. On multivariate Cox regression analysis, advanced age (HR=1.025; 95%CI, 1.013-1.037; P<0.001), chronic renal failure (HR=2.018; 95%CI 1.234-3.299; P=0.005), mechanical ventilation (HR=1.950; 95%CI 1.307-2.912; P=0.001), and neutropenia (HR=4.347; 95%CI 2.462-7.675; P<0.001), were found to be independent risk factors for 28-day mortality. However, antifungal therapy (HR=0.570; 95%CI 0.382-0.849; P=0.006) was an independent protective factor for 28-day mortality (Table 3).

Table 3 *Multivariable Cox regression analysis for 393 Candida* bloodstream infection episodes**
28-day outcome				Multivariable analysis
	Survival (n=281)	Death (n=112)	P-value	HR (95%CI)	P-value
Male	216(76.9)	76(67.9)	0.065	-		-
Age, y	55.2(19.5)	63.6(16.2)	<0.01	1.025(1.013-1.037)		<0.001
Underlying disease				-		-
Solid tumor	91(32.4)	27(24.1)	0.106	-		-
Hematologic malignancy	32(11.4)	16(14.3)	0.428	-		-
Diabetes mellitus	49(17.4)	28(25)	0.088	-		-
Chronic Cardiac disease	72(25.6)	52(46.4)	<0.01	-		0.105
Chronic Pulmonary disease	34(12.1)	18(16.1)	0.294	-		-
Chronic renal failure	20(7.1)	22(19.6)	<0.01	2.018(1.234-3.299)		0.005
Skin barrier compromised	24(8.5)	2(1.8)	0.015	-		0.308
Prior surgical intervention (<1month)	182(64.8)	62(55.4)	0.083	-		-
Corticosteroid use	40(14.2)	14(12.5)	0.652	-		-
Prior antifungal agents use (<6month)	64(22.8)	24(21.4)	0.772	-		-
Severity of clinical feature				-		-
Fever (T>38.2℃)	220(78.3)	89(79.5)	0.798	-		-
Parenteral nutrition	124(44.1)	56(50)	0.292	-		-
Mechanical ventilation	89(31.7)	58(51.8)	<0.01	1.950(1.307-2.912)		0.001
Renal replacement therapy	32(11.4)	17(15.2)	0.305	-		-
Central venous catheter	227(80.8)	89(79.5)	0.766	-		-
Neutropenia	24(8.5)	18(16.1)	0.029	4.347(2.462-7.675)		<0.001
Antifungal therapy	224(74.9)	75(25.1)	0.007	0.502(0.294-0.857)		0.006
No treatment	57(60.6)	37(39.4)	0.007	0.502(0.294-0.857)		0.006
Data were expressed as mean ± SD for continuous variables and n (%) for categorical variables. SD, standard deviation.

Our study showed that the incidence of Candida BSI has increased steadily in the past 11 years at our tertiary care hospital in Shanghai. Several studies have shown a substantial increase in Candida BSI incidence in the past two decades, which is similar to our study findings [4, 11, 22]. Intensive use of broad-spectrum antibiotics may be the main cause. In addition, gradually worsening hospitalized patient profiles, underlying comorbidities including malignancy, and a high frequency of surgeries may be predisposing risk factors for increased incidence.

C. albicans remains the most common pathogen causing Candida BSI. However, over the past two decades, an increased percentage of common non-C. albicans Candida spp. have been reported worldwide. In our study, non-C. albicans accounted for 64.1%. C. parapsilosis, C. tropicalis and C. glabrata accounted for most of the non-C. albicans species. However, some studies in western countries showed that C. glabrata was the most frequent species among non-C. albicans, whereas C. tropicalis was quite rare compared to the incidence reported in our study (5.9% and 7.0% vs. 27.4%) [23, 24]. In this study, the incidence of C. guilliermondii was significantly higher than that in other studies (4.8% vs. 0.4%) [25]. This could be related to the higher rate of parenteral nutrition and surgery (45.8% and 62.1%) in the current study, as some research implied intravenous nutrition and surgery as being significant risk factors for Candida BSI due to C. guilliermondii. [26].

The antifungal susceptibility testing showed that the susceptibility of C. albicans, C. parapsilosis and C. sake to fluconazole were quite high (94%, 89.5%, 100%). On the other hand, the resistance rate of C. tropicalis for fluconazole was as high as 43.3%, which was significantly higher than those reported in other studies abroad [27, 28]. This may deserve more attention from clinicians in actual application.

The contributing factors of the finding of quite low 28-day mortality rate for Candida BSI in patients from surgical wards compared to those of other wards need further study.

Since there was no significant difference in the 28-day mortality rate between the patients who received early appropriate (26.8%) or targeted antifungal therapy (25.1%), we further analyzed the demographic data, underlying diseases, and clinical features between these two groups. We found no significant differences between the two groups in age (p=0.33), sex (p=0.89), number of underlying diseases (p=0.32), and number of severe clinical features (p=0.96). The choice of antifungal agents between these two groups was further analyzed. In the early appropriate antifungal therapy group, the rate of azoles use was 50.6%, and the rate of echinocandin use was 30.3%. In the targeted antifungal therapy group, the rate of azoles use was 65.4%, and the rate of echinocandin use was 17.3%. The rate of echinocandin use was lower in the targeted antifungal therapy group than in the early appropriate antifungal therapy group (p=0.038). Is the lower rate of echinocandin use in the targeted antifungal therapy group one of the reasons that caused no significant difference in mortality between the two groups? Many studies have confirmed the important role of echinocandin in antifungal therapy. Echinocandin has been recommended as a first-line antifungal agent since 2009[18], with fluconazole as an acceptable alternative for selected patients, reflecting the efficacy demonstrated by echinocandins and increasing resistance observed with fluconazole[29, 30]. Therefore, we believe that lower rate of echinocandin use in the delayed antifungal treatment group is unlikely to lead to a decrease in the 28-day mortality rate.

On the basis the above analysis, we suggest that early antifungal therapy has no significant impact on the 28-day mortality rate compared with targeted antifungal therapy. Many clinicians currently administer empirical antifungal agents, and our study results could be used to guide the clinical care of their patients. Overuse of antifungal drugs inevitably leads to a waste of medical resources and increased drug resistance[31]. If empirical antifungal agents cannot improve mortality, we should reconsider their use. Several studies support our findings[15-17] that the severity of illness (APACHE-II Score) affected short-term survival in patients with Candida infection, whereas the choice of initial antifungal agents did not affect short-term survival. Trifi et al. revealed no beneficial impact of an empirical antifungal therapy on 28- day survival or in preventing the occurrence of candidemia in critically ill patients with non-neutropenic sepsis [32]. However, some studies differed in their findings on the timing of antifungal agents' use. Bassetti et al. showed that the use of antifungal agents within 48 hours of obtaining a positive blood culture result is an independent protective factor against mortality during hospitalization[14]; Similarly, Tedeschi et al. showed that the administration of appropriate antifungal agents within 72 hours after blood culture is a protective factor for mortality during hospitalization[33]. However, our results revealed similar risk factors (age, neutropenia, and mechanical ventilation) and protective factors (antifungal therapy) for 28-day mortality.

Although our data were collected from a large hospital in Shanghai, several limitations of this study should be taken into consideration. First, this was a retrospective study performed at a single center, which could lead to selection bias. Moreover, the severity of illness score (such as APACHE II score) and the timing of CVC removal were not included for analysis because of missing data. Further, because echinocandin susceptibility testing has not been carried out at our hospital, relevant clinical data could not be obtained.

Our retrospective study findings showed increased incidence of Candida BSI in the past 11 years in Shanghai. Although the percentage of non- C. albicans spp. has been increasing, C. albicans spp. remains the most frequently isolated species. The mortality of patients with Candida BSI was quite high, especially in internal medicine wards. Antifungal therapy improved the short-term survival of patients with Candida BSI. Whether preemptive antifungal therapy should be initiated or antifungal therapy should be initiated after the antifungal susceptibility test needs further discussion.

BSI, bloodstream infection; CI, confidence interval; CLSI, Clinical and Laboratory Standards Institute; EUCAST, European Committee on Antimicrobial Susceptibility Testing; HR, hazard ratio; HIV, human immunodeficiency virus; ICU, intensive care unit; IDSA, Infectious Diseases Society of America; SD, standard deviation

Funding:

This work was supported by the Program for Outstanding Medical Academic Leader, National Nature Science Foundation of China [81772107,81772040], Scientific and Technological Innovation Act Program of Science and Technology Commission of Shanghai Municipality [18411950900], Key Discipline Construction Project of Shanghai Municipal Commission of Health and Family Planning [2016ZB0206], Clinical Research Innovation Project of Shanghai Hospital Development Center [SHDC12017116] and Program of Shanghai Jiao Tong University School of Medicine [DLY201803].

Competing Interests:

The authors declare that they have no competing interests.

Availability of data and materials:

All data generated or analyzed during this study are included in this published article.

Code availability:

Not applicable

Authors' contributions:

ZTY, EZC, and EQM made substantial contributions to conception and design. ZTY, LZH,YJZ, LW, TX LZ, and XYL participated in the acquisition of data. ZTY, YJZ, and YC drafted the manuscript. ZTY and EZC revised it critically.

Ethics Approval:

The study was approved by the local institutional review board (Ruijin Hospital, Shanghai Jiao Tong University, School of medicine).

Consent to participate:

Not applicable

Consent for publication:

Not applicable

Acknowledgments:

We thank Ms. Wen-Jing ZHENG to produce the massive time first to the article English grammar, the usage, and so on has carried on the revision.

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Editorial decision: Reject
26 Feb, 2021
Reviewers invited by journal
09 Feb, 2021
Reviews received at journal
09 Feb, 2021
Editor assigned by journal
06 Feb, 2021
First submitted to journal
04 Feb, 2021

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Epidemiology, Species Distribution, and Outcome of Nosocomial Candida spp. Bloodstream Infection in Shanghai — An 11-year Retrospective Analysis in a Tertiary Care Hospital

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Abstract

Figures

1. Background

2. Methods

2.1 Study setting and population

2.2 Laboratory methods

2.3 Statistical analysis

2.4 Ethics

3. Results

3.1 Incidence and clinical features of Candida BSI episodes

3.2 Antifungal susceptibility of Candida isolates

3.3 Antifungal therapy and outcome of patients with Candida BSI

4. Discussion

5. Conclusions

Abbreviations

Declarations

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Authors' contributions:

Ethics Approval:

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Version 1