Decolonization of <i>Staphylococcus aureus</i> in Healthcare: A Dermatology Perspective

Kuraitis, Drew; Williams, Laura

doi:https://doi.org/10.1155/2018/2382050

Journal of Healthcare Engineering

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Review Article | Open Access

Volume 2018 | Article ID 2382050 | https://doi.org/10.1155/2018/2382050

Decolonization of Staphylococcus aureus in Healthcare: A Dermatology Perspective

Drew Kuraitis¹and Laura Williams¹

Academic Editor: Pedro Gomes

Received07 Oct 2018

Accepted06 Dec 2018

Published24 Dec 2018

Abstract

The bacterium Staphylococcus aureus is responsible for significant morbidity, mortality, and financial burden in healthcare. It easily colonizes susceptible patients and can cause recurrent infections, especially in populations at risk. In addition to treating sequelae of infections, there is a growing body of literature aimed at decolonizing susceptible patients in order to prevent infection and also to prevent spread. Such strategies are widely employed in surgical, intensive care, and hospitalist fields. Staphylococcus aureus involvement has been implicated in the pathogenesis and persistence of many dermatologic diseases that are treated in the outpatient setting. This review serves to summarize current evidence for the management of Staphylococcus aureus colonized patients, as well as the evidence available for decolonization. We further characterize the role that colonization may play in atopic dermatitis, recurrent infections, hand eczema, cutaneous T-cell lymphoma, and also in surgical infections after Mohs surgery.

1. The Role of Staphylococcus aureus in Healthcare

Staphylococcus aureus is considered normal flora of healthy mammals. In humans, the nose and pharynx are typical sites of colonization, with the nasal vestibule as the main reservoir [1, 2]. Overall carrier rates in healthy humans range from 20 to 50%. Studies have shown that colonizing strains of S. aureus are the same as strains isolated from local skin and soft tissue infections (SSTIs) [3]. After leaving its colonization site, S. aureus can infect any body part or organ system. It is the most common pathogen involved in SSTIs, is now the most common invasive pathogen in the United States [4], and is also responsible for 2% of hospital admissions [5]. Risk factors for colonization and/or S. aureus infections include hospital or nursing home exposure, immunodeficiency, chronic illness, poor hygiene, working with hogs, and being a household cohabitant of a colonized individual [6]. Due to its prevalence, associated morbidity, and ease of transmission, it is therefore beneficial from individual, epidemiological, and financial perspectives to intervene. A growing body of literature is focused on attempting to decolonize individuals in order to achieve this. If we can rid a carrier of colonizing Staphylococcus, we can improve morbidity, spread of disease, and the associated financial burden.

One of the major challenges when treating S. aureus is antibiotic resistance. Shortly after their clinical debut, methicillin and penicillin became ineffective against methicillin-resistant Staphylococcus aureus (MRSA) [7]. MRSA now compromises at least 60% of Staphylococcus isolates from intensive care units. It is suspected that current decolonization efforts may not be as effective when dealing specifically with MRSA [8]. On admission to the hospital, patients after often subjected to a nasal swab to identify MRSA carriers, but this procedure may miss up to 50% of carriers to colonization of extranasal sites [9]. Many agents used in decolonization are presumed immune to bacterial resistance, offering some advantages when attempting to decolonize MRSA. Literature is rich in meta-analyses and systematic reviews for managing Staphylococcus colonization in patients undergoing dialysis [10], orthopedic surgery [11, 12], cardiac surgery [13, 14], plastic surgery [15], and general surgery [16, 17]. To date, there is not a published review regarding this topic in dermatology. This review is intended to summarize the role that S. aureus carriage may play in common dermatologic conditions, as well as what evidence is available for dermatologists when recommending decolonization protocols.

2. Staphylococcus Colonization in Dermatology

S. aureus colonization has been implicated in the pathogenesis or persistence of many skin diseases, for which physicians will often recommend decolonization regimens. Unfortunately, randomized controlled trials (RCTs) investigating the role of decolonization in these diseases are lacking in literature, and there is no consensus as to the ideal decolonization protocol. We have summarized key points on what has been shown so far in literature with respect to common skin conditions that have been linked to staphylococcal colonization.

2.1. Atopic Dermatitis

Atopic dermatitis (AD) is a relatively common skin condition, with recent prevalence estimates of 15–20% in children and 2–10% in adults [18]. Strong associations exist between recurrent skin infections, disease severity, and S. aureus colonization [19, 20]. Individuals with AD have a greater concentration of S. aureus colonization of their skin [21]. Colonization of AD skin lesions can not only lead to skin infections in these patients but may also exacerbate the disease, further leading to infection and thereby contributing to chronic disease and frequent flares [22, 23]. Studies have shown that at least 80% of patients with AD are colonized by S. aureus, with up to 30% of the colonizing strains being MRSA [24, 25]. A recent systematic review pooled 95 studies and concluded that 70% of lesional skin is colonized, compared to 39% of nonlesional skin, and that 62% of patients with AD have nasal colonization. Furthermore, they also correlated prevalence of colonization with disease severity [26]. A prospective study that followed 605 pregnant women sought to determine whether or not S. aureus colonization can predict development of AD. They found that, in infants who developed AD, there is a marked increase in S. aureus colonization at age 3 months and also a greater prevalence 2 months prior to the diagnosis of AD, suggesting that S. aureus may have a role in the development and onset of AD in addition to its known role of exacerbating AD [27].

Although the pathogenesis of AD is multifactorial, patients overall remain at greater risk of skin and soft tissue infections due to skin changes that render them more susceptible. Such changes include the decreased level of barrier lipids [28, 29], increased local serum proteases [30], and reduced antimicrobial peptides, such as beta-defensin [31, 32]. Another important molecule which appears to be involved in S. aureus-AD interplay is filaggrin (FLG). FLG binds keratin and is important for barrier protection. It exerts its effect by promoting formation of the stratum corneum, reducing water loss, and regulating pH [33]. Some patients with AD have mutations in FLG and ultimately experience more severe disease. Individuals with FLG mutations have been associated with S. aureus colonization and disease severity, highlighting the relationship between genetics and the skin microbiome [34, 35]. S. aureus is also able to modulate the host environment, largely through superantigens, which disrupt the skin barrier by increasing proinflammatory cytokine production by keratinocytes [36]. The AD host environment appears to promote bacterial colonization, and in-turn, the bacteria aggravate the disease, propagating a pathogenic cycle. Therefore, breaking this cycle using decolonization methods may serve to lessen the severity of AD.

Sodium hypochlorite, or bleach, has been used in medicine as an antiseptic for centuries [37]. Bleach has broad-spectrum antimicrobial activity, including MRSA coverage, and does not carry the risk of antimicrobial resistance [37, 38]. Dilute bleach baths are a staple recommendation by dermatologists for the treatment of atopic dermatitis. It is thought that bleach baths can decrease colonization and recurrent skin infections in those with AD, thereby reducing disease severity and improving quality of life [39]. Bleach is also attractive due to its low cost, ease of access, and tolerability [37]. Despite initial studies showing promising results, a modified Cochrane review assessed RCTs that investigated whether or not AD can clinically improve using antistaphylococcal treatments and concluded that interventions such as bleach baths and topical antiseptics provide no clinical benefit for individuals who do not have evidence of current infection [40]. Of the 26 RCTs () that were analyzed, many of them had study-design limitations relating to lack of randomization method description, small sample sizes, or not describing baseline AD severity. Regardless, their systematic review does not dispute that antimicrobial interventions are successful in reducing the bacterial burden in AD and that this burden indeed plays a role in pathogenesis.

One RCT recruited 31 patients with AD who had clinical signs of bacterial secondary infection. They were treated with bleach baths twice per week and intranasal mupirocin twice per day for 5 days each month. Controls received vehicle alone. After 3 months, individuals in the treatment arm had a significant reduction in the amount of body surface area affected and reduced severity of their AD [41]. A similar RCT that focused on 200 patients with skin and soft tissue infections compared the decolonization ability of intranasal mupirocin alone for 5 days and intranasal mupirocin plus daily dilute bleach baths for 5 days. After 4 months, the study reported that combined treatment eradicated colonizing S. aureus in 71% of patients, compared to 48% in the mupirocin-alone group [42]. This study also included a control “education only” group. All control and treatment groups received education on hygiene, which stressed discarding lotions in jars, replacing lotions with pump or pour bottles, refraining from sharing personal items such as razors or towels, and washing bed linens at least once weekly and towels after each use. 38% of individuals in the “education only” group were reportedly cleared of colonizing bacteria. Although it appears that a combination of intranasal mupirocin and bleach baths may be effective at reducing bacterial colonization, proper sanitation alone may play an important role in decolonization. Given the vast fund of knowledge regarding the microbiome’s interactions with AD, it would be helpful if future studies correlate antimicrobial treatments and disease severity with the degree of colonization.

2.2. Recurrent Skin and Soft Tissue Infections

The incidence of Staphylococcus-associated SSTIs continues to rise [43]. SSTIs include abscesses, furunculosis, and cellulitis, and this group is now included in the 10 most common reasons for hospital admission [44]. Decolonization strategies are often recommended as a way to prevent recurrent SSTI. Common regimens again include bleach baths, intranasal mupirocin, and chlorhexidine body washes. A survey of healthcare providers revealed that the majority (53%) of providers treated recurrent SSTIs with the same antibiotic that was previously used for the same duration of time; providers of adult patients favored trimethoprim-sulfamethoxazole (TMP-SMX) and those of children favored clindamycin. Regarding decolonization recommendations, the top 3 antimicrobial therapies included mupirocin (88%), antiseptic body wash (79%), and bleach baths (34%) [45].

The previously mentioned study that found that intranasal mupirocin with bleach baths was superior to intranasal mupirocin or education alone for reducing colonization was focused on individuals with SSTIs [42]. One of the limitations to this study was that across all treatment arms, 20% of patients reported a recurrent SSTI one month after treatment. Another limitation was the lack of household decolonization. It is plausible that the benefits observed could have been sustained if the decolonization treatment was completed on a regular basis, or if household members could participate in the process as well. Risk factors for Staphylococcus colonization include household contact with someone who had a recent SSTI [46, 47]. An RCT of 183 individuals with a recent S. aureus abscess sought to compare the effectiveness of individual vs household decolonization on Staphylococcus carriage and recurrent SSTI [48]. After twice daily intranasal mupirocin and daily chlorhexidine washes for 5 days, the authors found no difference in the rate of colonization, but they did note that at 12 months, there were less reports of SSTIs in those undergoing household decolonization (52% vs 72%), suggesting a long-term benefit of household decolonization.

One study attempted to eradicate Staphylococcus colonization in patients with recurrent SSTIs by treating with a prolonged course of chlorhexidine wash twice per day for 60 days and 30 days of one oral antibiotic, as determined by the clinician. Although they reported impressive clearance rates of up to 90% at 4 months follow-up, this study lacked a control arm and also was unable to standardize the oral antibiotic regimen given to subjects [49]. The authors also acknowledge that their treatment course is longer than other regimens that have been studied, but that this may be justified in the treatment of recurrent staphylococcal SSTIs. Decolonization with the intent to reduce SSTIs has been extensively studied in military populations, as new recruits are at a high risk of developing SSTI [50]. SSTI is the leading cause of hospital admission in the first two years of a new recruit’s military career. One study followed over 33,000 recruits to a 13-week training course and demonstrated that showering 5 to 6 times with a chlorhexidine wash was able to reduce SSTI incidence [51]. This was in contrast with another study of over 30,000 recruits using chlorhexidine wash weekly, which did not demonstrate any benefit [52]. The latter study did not have recruits wash with chlorhexidine on arrival, which may account for the study differences. A secondary analysis of the latter study correlated reduced MRSA colonization of the nares with those who frequently used the chlorhexidine wash, despite the initial study not demonstrating a reduction in SSTI [53].

The presentation of an individual with a skin or soft tissue abscess is a common situation encountered in emergency rooms. The Infectious Disease Society of America’s guidelines for management of an uncomplicated abscess are incision and drainage (I&D) alone. Although the use of antibiotics in addition to I&D is controversial and reviewed elsewhere [54], two RCTs looking at abscess treatment with I&D with or without the antibiotic TMP-SMX did not identify differences in percentage of treatment failures or recurrent infections, demonstrating noninferiority. However, these studies followed patients longitudinally and suggest that antibiotic therapy after I&D prevented recurrent abscess formation at a new, distinct site. The pediatric study surveyed patients 10 days after treatment and found that 12.9% of those receiving antibiotics developed a new abscess, compared to 26.4% in the placebo group [55]. The other study followed adult patients to 30 days after I&D and found that 9% of those receiving TMP-SMX reported new lesions compared to 28% of those receiving placebo [56]. More evidence for the role of oral antibiotics in preventing recurrent SSTIs comes from a study of 357 S. aureus-colonized children requiring I&D for an abscess [57]. 331 of subjects received adjuvant clindamycin or TMP-SMX and 26 received no antibiotics. The mean follow-up appointment was 38 days later, when swabs were taken to determine if patients were still colonized and colonization rates were higher in those not treated with antibiotics. At 1 year follow-up, 57% of those who were colonized with S. aureus at the “38-day” follow-up reported a recurrent SSTI compared to 30% of those who were not colonized at follow-up. This study is of importance because it demonstrated that the administration of systemic antibiotics at the time of I&D may reduce colonization and is protective against recurrent infection. In the current era of antibiotic resistance, it seems unlikely that oral antibiotics will become standard of care for decolonization protocols. It is, however, important to note that oral antibiotics can reduce recurrent infections when considering risks and benefits of adjunct antibiotic therapy for SSTIs and abscesses.

2.3. Hand Eczema

Hand eczema is a chronic dermatitis characterized by dry, painful, cracked skin on the hands with or without blisters and weeping. It tends to be secondary to an irritant, such as gloves, vegetables, disinfectants, or other ingredients in personal care products. It is more common in people who frequently wash their hands, such as healthcare workers and chefs, but it is also increased in individuals with a history of AD [58, 59]. There have been two studies looking at the role S. aureus colonization may play in hand eczema. The first study demonstrated that patients with hand eczema were more likely to have Staphylococcus colonization on their hands and that this was associated with severity of disease [60]. The other study used a “glove juice” method where patients with severe hand dermatitis placed their hands in a loose-fitting glove and saline was used to rinse the entire hand, with analysis of the wash. This method helps to reduce sampling bias since the entire surface of the hand can be tested in this way. Not surprisingly, they found a positive association with severity of hand eczema and density of colonizing S. aureus in addition to increased baseline levels of colonization in those affected compared to healthy controls [61]. It is also notable to point out that neither of these studies showed a difference in nasal colonization when comparing patients with hand eczema and those without. A 2012 study found Gram-positive cocci contamination in 90% of topical medications and creams used by hand eczema patients, with 30% of these organisms being S. aureus [62]. Other studies have found similar results with cosmetics and creams in jar format, further highlighting the need for proper education regarding hygiene precautions [63]. Taken together, these studies suggest a role of S. aureus in the pathogenesis and/or persistence of hand eczema and that there may be clinically relevant exogenous sources of microbes in addition to nasal colonization, which is not significantly increased in patients with hand eczema. There is a lack of studies investigating the potential of decolonization in hand eczema management.

2.4. Cutaneous T-Cell Lymphoma

Cutaneous T-cell lymphoma (CTCL) is a clonal T-cell proliferation where malignant cells localize to the skin [64]. These cells can be characterized by their T-cell receptor variable region beta-chain (Vβ) expressions [65]. T-cells expressing particular Vβ variations can proliferate in response to Staphylococcus exotoxins and superantigens in vitro [66]. Sezary cells isolated from patients with CTCL have also been observed to proliferate in response to superantigen exposure [67]. Two case reports have further suggested a role for Staphylococcus in CTCL [68]. Swabs from erythrodermic skin were positive for Staphylococcus, and decolonization with antibiotics and petrolatum-containing acetic acid was attempted. One patient was successfully decolonized and was doing well at the time of publication; the other was not successfully decolonized and ultimately passed away after developing disseminated intravascular coagulation. MRSA was found in his peritoneal fluid. Later studies further correlated the presence of S. aureus superantigens with the incidence of erythrodermic CTCL [69] and also demonstrated and increased the rate of colonization in patients with CTCL compared to healthy individuals [70]. Further work has demonstrated that Staphylococcus exotoxins may lead malignant T-cells to produce interleukin-10, a cytokine that can reduce the immune response and has also been associated with progressive CTCL that is resistant to treatment [71]. Another case-control study looked at 310 individuals with CTCL with matched controls and found an elevated risk (odds ratio 3.33) of CTCL with a history of impetigo 1 to 5 years before diagnosis, further suggesting a possible role for bacteria in the development or persistence of the disease [72].

There has been one study investigating the role of decolonization in CTCL [73]. Of 106 patients sampled, 59% and 54% were colonized in the skin and nares, respectively, by Staphylococcus. Specifically, Staphylococcus aureus colonized 31% of skin- and nare-positive patients. Patients were treated with intranasal mupirocin twice daily for 5 days, then weekly, in addition to oral antibiotics for 4 weeks (dicloxacillin or cefalexin for penicillin-allergic patients). Over half of the treated patients demonstrated a clinical response to antibiotic therapy by having a reduction in BSA of at least 50%, with some patients progressing to a complete response, or 100% reduction in affected BSA. Antibiotics eradicated S. aureus colonization in up to 91% of patients treated at 4 to 8 weeks of follow-up. Flaring of CTCL was noted with recolonization. It would be interesting to follow patients for a longer period to see how long the decolonization protocol can improve or maintain remission of their disease, as well as using antibiotic-free methods of decolonization, such as bleach baths. Regardless, this study is important to the field as it has correlated clinical improvement with Staphylococcus decolonization in patients with CTCL.

2.5. Mohs Surgery

The risk of infection with Mohs surgery is considered low but varies with patient and environmental risk factors. Some cases deemed high risk will be treated with prophylactic antibiotics [74]. The World Health Organization recommends preoperative decolonization with twice daily intranasal mupirocin, with or without chlorhexidine wash, for prevention of surgical site infections in individuals who have had a positive Staphylococcus nasal swab [75]. Nasal colonization is the most important risk factor for surgical site infections in patients [76]. An RCT of 738 Mohs surgery cases randomized S. aureus carriers to decolonization treatment (consisting of intranasal mupirocin ointment twice daily and chlorhexidine wash daily for 5 days) or to no pretreatment, with surgical site infection noted as a clinical outcome [76]. 4% of colonized individuals who underwent decolonization developed a surgical site infection compared to 11% of carriers who were not subjected to decolonization. The frequency of surgical site infection in decolonized patients was similar to the 3% rate observed in noncolonized patients. The authors also performed a cost analysis and determined that it would be cheaper to give all patients prophylactic systemic antibiotics instead of swabbing and decolonizing patients, but caution that there are risks on an individual and on a population level by exposing individuals to unnecessary systemic antibiotics. Cited costs include taking time off for screening, swab materials, laboratory costs, and decolonization treatments. Around the same time, a RCT was published comparing the role of prophylactic antibiotics and decolonization in S. aureus 693 carriers undergoing Mohs surgery [77]. Prophylactic antibiotics consisted of 2 doses of oral cefalexin. 9% of patients receiving prophylaxis developed a surgical site infection, whereas no patients in the decolonization group developed an infection. Although this study was not blinded, it supports using decolonization procedures for identified carriers if the associated costs are within reason.

Despite Staphylococcus preferentially colonizing the nares and nasal passages, there is concern that nasal swabs may underreport true carriers, as organisms have been found elsewhere on nasal swab-negative patients. A recent RCT recruited 1350 nasal swab-negative patients and randomized to decolonization with twice daily intranasal mupirocin and daily chlorhexidine wash for 5 days vs no treatment [78]. At 1 week, 2% of patients who underwent decolonization had a surgical site infection compared to 4% of controls. Similarly, this study could not be blinded. Taken together, there appears to be a role in decolonization regardless of the results of a nasal swab with the overall trend towards reducing surgical site infection in Mohs patients.

3. Antimicrobial Resistance

Not surprisingly, there is growing bacterial resistance to mupirocin. One hospital saw their prevalence of mupirocin resistance in MRSA isolates increase from 2.7% to 65% after they started a mupirocin decolonization protocol [79]. It is important to note that this study observed a rapid rise of mupirocin resistance during a MRSA epidemic in a teaching hospital when mupiroin ointment was used intranasally three times per day every day during hospital admission. High rates of resistance have been associated with long-term use of mupirocin [80]. Other studies have identified hospitals and community homes with high rates of resistance [81], and resistance is associated with failure of decolonization [82]. Similarly, the prevalence of chlorhexidine resistance is increasing, with reported resistance rates of up to 19.3% in the intensive care unit setting [83]. Most studies examining the development of resistance have focused on hospital wards and intensive care units. There is a call for antiseptic stewardship, wherein one would restrict use of antiseptics for nonevidence-based applications [84]. In the era of antibiotic resistance, it remains to be seen whether the morbidity and financial benefits of decolonization can outweigh the risks associated with resistance to these agents. As there has not been reported resistance to bleach baths, it is possible that this could substitute for chlorhexidine washes in future decolonization protocols.

4. Future Studies and Conclusions

The Infectious Disease Society of America has published recommended guidelines for recurrent MRSA infections, which include 5 to 10 days of intranasal mupirocin, with body decolonization with daily chlorhexidine washes for 5 to 14 days or 15-minute dilute bleach baths twice per week for 3 months [85]. These recommendations are based on evidence relating to SSTI, as well as endocarditis and central nervous system infections. This regimen is common in the studies discussed and appears to have the ability to successfully decolonize patients. In the context of antimicrobial resistance, there is a growing need for successful decolonization strategies that can maintain long-term eradication.

S. aureus is a particularly troublesome organism in dermatology. It has been implicated in the pathogenesis and persistence of multiple skin conditions. Decolonizing affected individuals may have a positive effect on their disease, in addition to preventing recurrent infections. Tailored decolonization protocols may be best depending on the patient’s condition.

Disclosure

LW is a subinvestigator for Novartis/Clarity study (CAIN457A2326), 6/2017–6/2018.

Conflicts of Interest

The authors declare that they have no conflicts of interest.

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Copyright © 2018 Drew Kuraitis and Laura Williams. 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.

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