Current Status of Clostridium difficile Infection in humans


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Prof. Mahendra Pal*

Citation: Mahendra Pal*, Mati Roba Bulcha** and Wakuma Mitiku Bune***,

Copyright Copyright © 2021 Mahendra Pal*, Mati Roba Bulcha** and Wakuma Mitiku Bune***, This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Abstract:

Community acquired Clostridium difficile infection is recognized as an increasing public health threat. In developed countries, Clostridium difficile , an anaerobic spore-forming gram-positive bacterium, is the most important cause of healthcare associated diarrhea. The health effects of C. difficile infections in a human were not recognized until the 1970s. Antibiotic treatments allow Clostridium difficile to germinate sufficiently to establish infection. Because of the emergence of a more virulent strain, the incidence and severity of Clostridium difficile infection (CDI) have increased dramatically in high-income countries.  The spores of Clostridium difficile are resistant to commonly used decontaminants and can persist for long periods without the loss of viability. The diagnosis of Clostridium difficile infection poses a challenge to health professionals. The use of clindamycin and penicillin’s has been traditionally considered to cause the greatest risk of infection. Oral therapy with vancomycin and fidaxomicin are the considered the mainstay of CDI treatment. Application of proper hand hygiene before and after contact of a patient with CDI is a simple practical step to minimize the infection.

Keywords: Anaerobic bacterium, Clostridium difficile,  Community acquired infection, Hand hygiene, Diarrhea, Public health threat,  Spores


Description:

1. Introduction

In developed countries, Clostridium difficile is the most important cause of healthcare-associated diarrhea (Jury et al., 2013). Clostridium difficile (C. difficile) is a major public health problem that directly affects patient safety and causing significant health and economic consequences to the healthcare system (De Roo and Regenbogen, 2020). Clostridium difficile is an anaerobic spore-forming gram-positive bacillus, which acquired from the environment or by the fecal-oral route, and it is a major cause of antibiotic-associated diarrhea and colitis in the industrialized world (Vely and Ferrada, 2020; Pal and Bulcha, 2021). The health effects of C.difficile infections in a human were not recognized until the 1970s.

Different studies demonstrated that C.difficile–associated disease (CDAD) encompasses a range of disease severity from toxic megacolon, which can result in even death. The source of acquisition of C. difficile in community-associated cases is unclear (Jury et al., 2013). Because of the emergence of a more virulent strain, the incidence and severity of CDI have increased dramatically in high-income countries (Gingras et al., 2016). The spores of this anaerobic bacterium are resistant to commonly used decontaminants and can persist for long periods without the loss of viability. Antibiotic treatments allow C. difficile to germinate sufficiently to establish infection.

The formation of vegetative cells through the germination of spores followed by attachment to intestinal epithelial cells is a critical step in the pathogenesis. Therapy with clindamycin and penicillin has been attributed to cause the most risk of the infection to the patient. For the development of C. difficile disease, antibiotics are the major risk factor because of the loss of endogenous microbiota that allows C. difficile to proliferate and invade. Preventing ingestion of the organism and its spores by patients are control measures for C. difficile (Vely and Ferrada, 2020). The present communication delineates the current status of Clostridium difficile infection in humans.

1.1. Source and transmission

The potential sources of C. difficile in the community are not fully understood (Chitnis et al., 2013). Clostridium difficile is a major risk in healthcare settings and causes increasing prevalence in the broader community (Durham et al., 2016).  The organism is ingested either as the vegetative form or as spore form. Patients shed spores into the environment (Gupta and Khanna, 2014). Horizontal transmission from symptomatic patients continues to be viewed as the source of most cases of infection (Surawicz et al., 2013). In the environment, C. difficile may be ubiquitous. C. difficile is found in most mammals, and various birds and reptiles` intestinal tract. Patients with asymptomatic colonization and sources in the wider environment, such as water, farm animals, and food products such as processed meat, fish, and vegetables can also contain C. difficile (Hensgens et al., 2012; Pal and Bulcha,2021). Whole-genome sequencing is helping to track transmission across health-care facilities, countries, and continents (Martin et al., 2016).

1.2. Pathogenesis and Clinical Features

After a personal contact with the spores of a toxin-producing strain of C. difficile, spores colonize the large intestine and results in alteration of the normal colonic microbiota, permitting colonization of the organism (Britton and Young, 2012), and C. difficile starts to dominate large intestine, which might be the first step of infection.  Clostridium difficile virulence is mostly due to enzymes and toxins leading to disruption of fluid secretion, neutrophil adhesion, and local inflammation. Toxins produced by C. difficile are transported to the cell cytoplasm, where they inactivate the Rho family of GT Pases result in the inflammatory process intensifies. The Rho protein takes part in actin polymerization, and result in stabilizes the cell cytoskeleton. Micro ulcerations covered with pseudomembranes start to occur on the intestinal mucosal surface (Loo et al., 2011). In severe cases, it causes diarrhea, abdominal pain, fever, nausea, vomiting, leukocytosis, raised C-reactive protein, and low albumin level (Monaghan et al., 2015; Pal and Bulcha, 2021).

1.3. Diagnosis and Treatment

The diagnosis of C. difficile associated diarrhea requires a careful history of the patient. A detailed description of the patient’s diarrhea is important in differentiating other causes of diarrhea (Loo et al., 2011).History of fever, immunosuppression, previous infection with C. difficile, recent change in bowel habits, and the presence of abdominal symptoms are considered. An enzyme immunoassay that detects toxins A and B is the most common for diagnosing the infection (Simor, 2010). Glutamate dehydrogenase (GDH) tests based are characterized by rapid turnaround time as well as a specificity of almost 100% (Czepiel et al., 2019). Currently, the American Society of Colon and Rectal Surgeons (ASCRS) recommended a combined bowel preparation (CBP) that involves both mechanical (MBP) and oral antibiotic (ABP) components (Mangieri et al., 2021).

According to IDSA guidelines published in February 2018, the treatment of choice for CDIs is oral vancomycin or fidaxomicin, with oral metronidazole (Vely and Ferrada, 2020). Rifaximin, tigecycline, and bacitracin other treatment regimens but the pieces of data supporting their efficacy are inadequate (Kechagias et al., 2020). Presently, vancomycin and fidaxomicin are the considered the cornerstones of CDI treatment (Czepiel et al., 2019). Lantibiotics are antimicrobial peptides that exhibit potent activity against C. difficile.  Lantibiotics possess novel modes of action with lower rates of resistance development and less deleterious effect on the protective gut microbiota (Sandiford, 2019).

1.4. Prevention and Control

The primary means of transmission are from environment-to-person or person-to-person via the fecal-oral route (Bloomfield and Riley 2016). If there is direct contact with feces, hand washing with soap and water is imperative. To decrease transmission to other patients, it is essential to accommodate patients with CDI in a private room with a dedicated toilet. Good hand hygiene before and after contact of a patient with CDI is very mandatory. It is advised that antibiotics to be prescribed to the patient for treatment should be based on the local epidemiology and  C. difficile strains (Jakobsson et al., 2010).

2. Conclusion and Recommendations

Clostridium difficile infection is potentially life-threatening, especially in elderly people and in patients in hospitals and communities worldwide. Now it has emerged in the community in populations previously considered low risk.  Close contacts, the environment, animals, and food are potential sources of this infection. The diagnosis of C. difficile infection continues to be a challenge for health workers. Further surveillance methods are needed to monitor the incidence and to identify a way of transmission. Based on the above conclusion, the following recommendations are forwarded:

•    All hospital staff should wear gloves and gowns to minimize contamination when entering rooms with CDI patients and when caring for them.
•    Proper washing of hands with soap and water before and after contact with CDI patients is advised.
•    It is emphasized to minimize the frequency and duration of high-risk antibiotic therapy.
•    Further research on the pathogenesis, and epidemiology should be conducted.

Acknowledgements
The authors are very thankful to Prof.Dr.R.K.Narayan for his suggestions during the preparation of manuscript and Anubha Priyabandhu for computer help.

Contribution of authors
All the authors contributed equally. They read the final version, and approved it for publication.

Conflict of interest
The authors declare that they do not have conflict of interest.

Source of financial grant

There was no financial support for this manuscript.


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