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Factors affecting development of Clostridium difficile infection in hospitalized pediatric patients in the country Georgia

BMC Research Notes volume 11, Article number: 409 (2018) Cite this article

Abstract

Objective

Main aims of our study were to investigate occurrence of Clostridium difficile among hospitalized pediatric patients in Georgia and examine risk factors for the development of C. difficile infection. During our study we tested and piloted the real-time PCR diagnostic systems for rapid and simultaneous identification of C. difficile and number of other pathogens in our facility settings. A cross-sectional study has been performed in children less than 18 years of age in two pediatric hospitals in Georgia, between May 2016 and December 2017. Stool specimens negative by the conventional bacteriology analysis were analyzed for the presence of C. difficile and several viral and protozoa pathogens using enzyme immune assay and polymerase chain reaction. In total samples from 220 hospitalized children with gastroenteritis symptoms were analyzed in this study.

Results

The average age of the study participants was 4.7 years. Overall 23 children were identified positive for C. difficile (10.5%). Antibiotic exposure within 2 months preceding the onset of diarrhea was associated with an increased risk of C. difficile infections. The risk was greatest with cephalosporins, followed by penicillins, carbapenems and macrolides. Clostridium difficile is an important cause of healthcare-associated diarrhea in pediatric population of Georgia.

Introduction

Clostridium difficile, a Gram-positive, spore-forming bacillus is transmitted by fecal–oral route or from environment [1]. Clostridium difficile infections occurrence has been increased among hospitalized pediatric patients across the world [2]. Colitis associated with C. difficile is the result of a derangement of normal bacterial colonic flora. Clostridium difficile colonization causes release of enterotoxins and cytotoxins, which cause diarrhea, inflammation and damage of mucosa [3]. Two different toxins are made by pathogenic strains of C. difficile. Toxin A, is an enterotoxin and toxin B, a cytotoxin. Both of these toxins are high-molecular weight proteins, which bind specific receptors on the intestinal mucosal cells [3].

Clinical manifestations of C. difficile vary from asymptomatic colonization to pseudomembranous colitis with signs of fever, severe abdominal pain and bloody diarrhea [2]. Even short-term use of a single antibiotic can potentially cause C. difficile colitis. Risk of colitis increases, if two or more antibiotics are used, or antibiotic course is prolonged [3].

Clostridium difficile infections are increasing among hospitalized pediatric patient [2]. Recent articles of clinical practice guideline for infections caused by C. difficile in adult patients didn’t encompass issues that are specific to pediatric patients, because previously it was believed that C. difficile infections were more common in elderly patients and specific populations such as children and young adults were at low risk [2, 3]. Diagnosis of C. difficile associated colitis should be suspected in all hospitalized patients having diarrhea [3]. Available stool assays to diagnose C. difficile infection are: stool culture, stool cytotoxin test, enzyme linked immunoassay (EIA), real-time polymerase chain reaction (PCR) assay, EIA to detect toxins A and B and Latex agglutination test [3]. At this time, the most commonly used test to detect C. difficile toxins is commercially available EIA, which can detect toxin A and/or toxin B in stool samples [2]. In recent studies, the sensitivity of real-time PCR for toxins A and B compared with EIA for toxins A and B were superior and the specificity was equal. The number of repeated samples decreased with the use of the PCR, which is currently a preferred and approved method for diagnosis of C. difficile infection by many hospitals and laboratories, but more studies are needed before PCR can be used routinely [2].

The aim of our study was to examine risk factors for C. difficile infection and evaluate occurrence of C. difficile and some other gastrointestinal pathogens among hospitalized pediatric patients in Georgia.

The definition of pediatric patients is children aged from 1 month of age to 18 years. Diarrhea in pediatric patients by The World Health Organization is defined as “the passage of three or more loose or liquid stools per day, or more frequently than is normal for the individual” [4,5,6,7]. The definition of antibiotic associated diarrhea is diarrhea associated with antibiotic use, either during antibiotic exposure or for up to 8 weeks after discontinuation of antibiotic therapy [4, 8, 9]. Although etiologic agents for antibiotic associated diarrhea vary and sometimes pathogens can’t be identified, up to one-third of antibiotic associated diarrhea cases are caused by C. difficile infection. Etiologies of antibiotic associated diarrhea among pediatric patients may also include viruses (20%) [4, 10] or C. difficile (25%), but also may be caused directly by osmotic imbalances in the intestines due to antibiotic exposure and disruption of normal bacterial flora.

Gender doesn’t seem to have any significant impact on C. difficile infection in pediatric patients, as the incidence of these cases among female and male patients is nearly equivalent [4]. Risk factors predisposing to antibiotic associated diarrhea can be divided into two main groups: host factors (e.g., age) and disruptive factors (e.g., antibiotics) that may have damaging effect on the normally protective intestinal bacterial flora [4, 9, 11]. The incidence of antibiotic associated diarrhea may be even higher (65%) if broad-spectrum antibiotics (cephalosporins, penicillins, carbapenems, macrolides, etc.) were used [4]. The number of clinical studies determining and identifying risk factors for antibiotic associated diarrhea in children is limited.

Therefore, the aim of this study was to determine risk factors for hospitalized children during the incident C. difficile infection episode that are associated with developing C. difficile infection within 60 days during hospitalization or after discharge and to evaluate risks related with the specific antibiotics in order to better understand the risks of prescribing various antibiotics in the community and hospital setting.

Main text

Methods

A cross-sectional study was performed in children < 18 years of age in two pediatric hospitals between May 2016 and December 2017. Stool samples were collected from the pediatric patients admitted to two large tertiary children’s hospitals in Tbilisi, capital of Georgia. Hospitals involved in the study were: M. Iashvili Children’s Central Hospital and Tbilisi Children’s Clinical Hospital for Infectious Diseases. Both hospitals are admitting patients from capital and patients transferred from other regional hospitals around Georgia. Laboratory investigations were done in the Clinic NeoLab, Tbilisi, Georgia.

Stool specimens were analyzed for the presence of C. difficile using a two-step testing algorithm including PCR and EIA. Totally 220 children meeting the definitions of this investigation who met our inclusion criteria were enrolled in this study.

Clostridium difficile infection was defined as the presence of any gastrointestinal symptoms accompanied by a clinical suspicion of C. difficile infection as well as a positive result for C. difficile toxins from rapid stool testing or C. difficile confirmation by PCR method or both. Final determinations were carried out by the attending physician or the hospital’s infection control team [12].

Stool of patients negative by the conventional bacteriology analysis covering enteric bacterial pathogens was investigated. Enzyme immunoassay testing kits for C. difficile toxins A and B were used as the rapid testing method (CerTestbiotec, Zaragoza, Spain). EIA test positive samples were analyzed by multiplex real-time PCR using Neo_PCR_Diagnostics system (NeoLab, Tbilisi, Georgia) [13] for confirmation of the infection and for simultaneous identification of additional gastrointestinal pathogens including Entamoeba histolytica, Giardia lamblia, Cryptosporidium parvum, Adenovirus, Rotavirus, Norovirus and Astrovirus. DNA extraction from the stool samples was performed by DNA purification system (OxGEn Molecular Solutions, Tbilisi, Georgia) [13]. Clostridium difficile EIA negative samples were tested for the presence of the above listed pathogenic agents using the same type EIA kits as for C. difficile described above (CerTestbiotec, Zaragoza, Spain) for presence of the corresponding pathogen.

The sample size calculation was performed for Chi Squared Statistic to compare proportions of dichotomous variables for the following parameters: α = 0.05 (two-sided), β = 0.20, proportion of subjects with the outcome in one of the groups = 10%, odds ratio (OR) ≥ 2.0 [14]. By these calculations the minimum number of patients who had to be included in the study was equal to 219. Patient data were extracted from their medical charts and entered into the MS Excel spreadsheet. IBM SPSSV.21 software was used for the statistical analysis. The factors associated with the C. difficile infection were categorized into dichotomous variables and Pearson’s Chi square test was applied to define statistical significance p. The p value < 0.05 was considered as statistically significant.

Results

The average age of the study participants was 4.7 years. Overall 23 children were identified positive for C. difficile (10.5%).

In samples negative for C. difficile the following enteric pathogens have been revealed with the following frequencies: Rotavirus in 14 cases (6.4%), Adenovirus in 13 (5.9%), Giardia lamblia in 11 (5.0%), Astrovirus in 4 (1.8%), Cryptosporidium parvum in 4 (1.8%), Entamoeba histolytica in 3 (1.4%) and Norovirus in 3 (1.4%) cases.

Out of 23 C. difficile positive patients, in four children we have identified co-infection with Giardia lamblia (17.4% co-infection rate) and in three children we identified co-infection with Adenovirus (13% co-infection rate).

Agreement between the PCR-based and EIA-based tests was excellent having disagreement only for one case where PCR was positive for Adenovirus while negative for this virus by EIA.

The study of the association of several factors with the development of C. difficile infection showed (Table 1) that the age more than 4 years old represented independent risk-factors of the development of C. difficile infection, while the gender and ethnicity was not associated with the infection. Antibiotic exposure within the month preceding the onset of diarrhea was statistically significantly associated with an increased risk of C. difficile infections. The risk was greatest with cephalosporins, followed by penicillins, carbapenems and macrolides.

Table 1 Association of different factors with the development of Clostridium difficile infection
Full size table

Discussion

Over 19,000 cases of diarrheal diseases are reported annually through state registration system in Georgia [15]. Over 70% of all registered cases are among children and one-fifth of cases are reported in Tbilisi. In over 80% of in-patient cases of diarrheal diseases covered by the public system in 2015, specific causing agent was not identified, signifying the lack of access to proper diagnostics and limitation of targeted treatment [15].

Our study showed a substantial portion of the C. difficile infection among the pediatric patients whose stool samples were negative by conventional bacteriology investigations. In addition, diverse viral and protozoa pathogens—both as the independent agents and as a co-infection to the C. difficile, were detected in these patients. Study also showed independent association of age and use of antibiotics with development of C. difficile infection.

Clostridium difficile is the frequent pathogenic agent causing diarrheal disease among hospitalized pediatric patients. Development of C. difficile related diarrhea is associated with the antibiotic treatment of pediatric patients hospitalized due to the different clinical diagnosis.

In the substantial portion of cases the antibiotic treatment is not optimal leading to the prolonged diarrhea and activation of C. difficile infection which is difficult to manage. Our study also shows that besides C. difficile infection other pathogens including viruses and parasites are responsible for the development of gastrointestinal infection and these infections cannot be managed by antibiotic treatment.

Our data are in agreement with the results of studies performed by other research groups in different countries, indicating to the growing importance of the C. difficile infection in the gastrointestinal morbidity among children in the whole world.

Studies carried out by different research groups on pediatric antibiotic associated diarrhea have shown [4] that there is three main factors affecting development of C. difficile infection: (1) patient factors—age, gender, comorbidities; (2) factors damaging protective intestinal normal bacterial flora—surgery, nasogastric tube feeding, gastrostomy, antibiotics, different medications; (3) long-term exposure to C. difficile spores (longer hospital stays, previous admissions, staying with infected patients in same room) [4, 16, 17]. Regardless of the above listed factors, not all act equally in the pediatric and adult patients. The risk factors that are common for pediatric C. difficile infection include: age 1–4 years old, comorbidities (cancer patients and patients with inflammatory bowel disease), use of antibiotics within previous 8 weeks (especially several antibiotics at the same time, cephalosporins, penicilins and macrolids), and history with hospitalization [4, 18, 19].

The most significant risk factor for recurrent disease is antibiotic exposure, including the use of non-CDI agents during treatment of C. difficile infection. In addition, a history of C. difficile infection and underlying comorbidities, particularly those related to problems of immune system are associated with the recurrence of infection [1, 20, 21].

When individual is hospitalized or exposed to C. difficile spores, two factors play important role in development of C. difficile infection: disruption of the healthy, highly diverse colonic normal bacterial flora and no preformed C. difficile antitoxin antibodies and/or failure of proper humoral immune response development against C. difficile toxins [22]. Accordingly, C. difficile is classified by CDC as one of three antibiotic-resistant infections that “are immediate public health threats that require urgent and aggressive action” [22, 23]. Although pediatric patients have not previously been known to be at high-risk for C. difficile infection, recent studies indicate that C. difficile infection is currently increasing in pediatric patients in both community and hospital settings [24,25,26]. The rate of hospitalized children with C. difficile infection has nearly doubled in the last decade [24, 27].

Clostridium difficile is a one of the principal cause of antibiotic-associated diarrhea in pediatric patients. One factor that complicates the assessment of the role of C. difficile infection in children is the possibility of co-infection with other gastrointestinal microorganisms. In this study, we identified C. difficile co-infections in young children, in an effort to discuss the frequency of co-infections and their possible role in the C. difficile infection clinical presentation severity. The summed percentage of identified co-infections was 34.2%. However, the spectrum of co-infections tested differed significantly among studies and 38% of stated co-infections did not described any pathogen.

Small sample sizes and unclear C. difficile infection case definitions hinder meaningful conclusions on the true rate of co-infections in this patient population. According to this study, one can assume that co-infections may be common in children with diarrhea who had positive C. difficile test results. Clostridium difficile is a significant cause of hospital associated diarrhea in pediatric population of Georgia. The findings share similarities with the studies from other countries, establishing the administration of broad-spectrum antibiotics as a risk factor for C. difficile infections.

Limitations

The number of clinical studies determining risk factors for pediatric antibiotic associated diarrhea is limited. In young children a broad panel of pathogens should be tested for to exclude other microbiological causes. However, small sample size in our study and poor quality of the available literature on this subject highlights a need for further studies.

Abbreviations

CDI:

Clostridium difficile infection

EIA:

enzyme immune assay

PCR:

polymerase chain reaction

WHO:

World Health Organization

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Authors’ contributions

IM conceived the idea for the study, designed the study, was responsible for study management and data collection, collected samples and patients medical records, assembled and interpreted the findings, drafted the article. VM contributed to the data analysis and interpretation of the findings, critically revised the article for important intellectual content and drafted the article. IC contributed to the data analysis and interpretation of the findings, critically revised the article for important intellectual content, contributed to the final approval of the paper and drafted the article. GS was responsible for study management and data collection, collected samples and patients medical records, helped to draft article. KG was responsible for study management and data collection, collected samples and patients medical records, helped to draft article, MB was responsible for the management and analysis of clinical data. GK conceived the idea for the study, designed the study, was responsible for study management and data collection, performed the data analysis and interpreted the findings, performed statistical expertise, critically revised the article for important intellectual content, contributed to the final approval of the paper and drafted the article. All authors read and approved the final manuscript.

Acknowledgements

We acknowledge the assistance of Dr. M. Busishvili, Dr. L. Dekanozishvili, Dr. M. Tvildiani at M. Iashvili Central Children Hospital for their significant role in sample and clinical data collection process. We would like to express our sincere gratitude to Dr. J. Janashia and Dr. G. Khokrishvili at Tbilisi Children’s Clinical Hospital for Infectious Diseases for their support.

Competing interests

The authors declare that they have no competing interests.

Availability of data and materials

The datasets generated and/or analyzed during the current study are not publicly available due patients individual privacy reasons but are available from the corresponding author on reasonable request.

Consent for publication

Not applicable.

Ethics approval and consent to participate

Our study was conducted with the approval of the Ethics committee of PhD program at David Tvildiani Medical University. In principle, individual patients who met the inclusion criteria were not given direct explanations of the study and no direct consent was thought. At hospitals, standard hospital consent letters for diagnostic investigations and treatment were signed by patient’s parents. There was no research-related contract with patients or their parents. Informed consent was not required because patients were investigated and treated according to the local standard of care and no additional clinical interventions were made based on stool sample collection process. Stool samples were taken prospectively from patients with negative bacterial cultures identified by the routine bacteriology studies. Only stool samples were collected and no other interventions have been performed. Patient records when accessed included details on patients name and other identifying data. These records were accessed retrospectively after treatment and discharge of patients. We are keeping patient’s identity strictly confidential.

Funding

Research project main financial support was provided by Shota Rustaveli National Science Foundation (SRNSF) (http://www.rustaveli.org.ge), grant # PhDF2016_69; Research presented in this paper was co-funded by Health Research Union (http://www.hru.ge) and David Tvildiani Medical University (dtmu.ge).

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Authors and Affiliations

  1. AIETI Medical School, David Tvildiani Medical University, Tbilisi, Georgia

    Iuri Migriauli, Vakhtang Meunargia, Giorgi Sabakhtarishvili & Kakha Gujabidze

  2. M. Iashvili Central Children Hospital, Tbilisi, Georgia

    Ivane Chkhaidze

  3. Tbilisi State Medical University, Tbilisi, Georgia

    Ivane Chkhaidze

  4. Health Research Union and Clinic NeoLab, Tbilisi, Georgia

    Maia Butsashvili & George Kamkamidze

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  1. Iuri Migriauli
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Correspondence to Iuri Migriauli.

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Migriauli, I., Meunargia, V., Chkhaidze, I. et al. Factors affecting development of Clostridium difficile infection in hospitalized pediatric patients in the country Georgia. BMC Res Notes 11, 409 (2018). https://0-doi-org.brum.beds.ac.uk/10.1186/s13104-018-3517-0

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