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The effect of probiotics on the clinical status of adult patients with atopic dermatitis: a systematic review

European Journal of Medical Research volume 27, Article number: 94 (2022) Cite this article

Abstract

Objectives

To describe, through a literature review, the results and benefits of oral and topical probiotics for adult patients with atopic dermatitis.

Design

A systematic review of articles published over a 13-year period was conducted to answer the following questions: (1) what information is given in the scientific literature concerning the use of probiotics in adult patients with atopic dermatitis? (2) Was there an improvement in the clinical status of the patients? (3) Was there a change in the microbial profile in patients after using such approaches? (4) Among the probiotics used, which was the most used in adult AD patients? (5) What was the average time of these interventions? (6) What were the outcomes?

Results

Seven studies with different sample sizes, ranging from 16 to 109 patients, were included in this review. These studies were all clinical trials (7/7), and probiotics (7/7) was the model of intervention chosen. Probiotics showed a potential to relieve the symptoms of the study groups with a reduction of pruritus and SCORAD when compared to the placebo groups. However, their effectiveness varied according to the strain, period, and form of administration.

Conclusions

Many studies have demonstrated that probiotics improve the symptoms of atopic dermatitis and even its prevention. However, there is still much controversy and divergence concerning the real benefits. Despite this, probiotics have demonstrated a fair ability in improving AD adult patients’ symptoms in terms of decreasing pruritus and severity related to SCORAD.

Introduction

Atopic dermatitis (AD) [1] is characterized as one of the most common chronic cutaneous inflammatory disorders today and its prevalence has increased worldwide. It affects 10–20% of children and 1–3% of adults [2, 3]. A clinical diagnosis of AD is imperative and indispensable [4, 5] as there is still no laboratory marker that is specific for its diagnosis. Furthermore, its pathogenesis has not yet been fully explained as this involves the interaction of factors such as: defects in skin barrier function, immunological changes, psychological aspects (like stress) and environmental aspects, in addition to the participation of infectious agents [5].

The clinical approaches to individuals with AD are to avoid triggering factors, the use of topical calcineurin inhibitors and topical corticosteroids associated with moisturizers due to transepidermal fluid loss, to control itching with the use of antihistamines, and in refractory cases, immunosuppressants may be prescribed [6]. These medications, despite providing relief and some resolution of AD symptoms, are not a definitive treatment, and consequently, new therapies must be sought and investigated [6].

Some AD patients have food allergies due to the permeability of the small intestine. These allergies are commonly related to cow's milk, eggs and peanuts [6]. Such allergies strongly influence the degree of disease evolution and affect 35–40% of school-aged patients with AD; moreover, this is four times more prevalent in children under 5 years old [6, 7].

To understand these allergies in AD patients, it is necessary to know the microbial profile of AD. In healthy individuals, Staphylococcus epidermidis is predominant and, together with Staphylococcus cohnii, it could provide protection for the development of atopic dermatitis [8]. However, individuals with AD have a greater colonization of Staphylococcus aureus. This causes an increase in permeability of the skin barrier in individuals with active eczema, and an instability of the skin barrier, which lead to a chain reaction, and consequently an inflammatory process [8, 9], through the participation of inflammatory cells and immune responses with late (Th1) and immediate (Th2) phases [10,11,12].

The intestinal microbiota in healthy and AD individuals are also different. The intestinal flora of healthy individuals contains species of the Lactobacillus (phylum Firmicutes) and Bifidobacterium (phylum Actinobacteria) genera, while Clostridium (phylum Firmicutes) or Staphylococcus (phylum Firmicutes) are associated with atopic diseases. These latter two microorganisms are also more commonly found in children born by cesarean delivery [13, 14].

Due to these differences in intestinal microbiota, various studies have proposed the use of prebiotics, probiotics and/or synbiotics as therapies in the treatment of AD patients [15,16,17,18]. Probiotics are microorganisms that bring health benefits to the host if administered alive in certain amounts [19]. The organisms that are most used as probiotics are bacteria of the genera Lactobacillus and Bifidobacterium, and yeasts of the species Saccharomyces boulardii [20]. Most of these microorganisms are naturally part of the human enteric microflora, and, therefore, can survive gastric digestion. The main criteria for the choice of these probiotics are the fact that they can reach the intestines still alive and adhere to the walls [20].

Prebiotics are nutrients that promote the growth and/or activity of certain species of bacteria in the intestinal microbiota, and thus benefit the host [20]. Therefore, foods with prebiotics should have certain properties, such as specificity in relation to the bacteria to be targeted in the colon, the ability to increase the quality of the microflora benefiting the host and not be susceptible to absorption and hydrolysis in the upper digestive tract [20].

Synbiotics have both probiotic and prebiotic properties. This appropriate combination of both components makes them have a superior effect than probiotics or prebiotics alone [21, 22].

These alternative treatment therapies have demonstrated effectivity in treating a variety of conditions, including diarrhea, AD, and other chronic inflammatory conditions. The therapeutic potential is due in part to the effects of modulating the immune response, in addition to the competitive inhibition of microbiota components in the intestine and increased function of the epithelial barrier, which may help provide protection against the appearance of AD [15,16,17,18]. Also, some authors have suggested that early intervention during pregnancy could possibly be more effective than a late or postnatal intervention [23].

However, although several species have been considered effective in preventing or treating atopic dermatitis, the efficacy of probiotics in controlling AD is still uncertain [24]. Due to this controversy, the present study aims, through a systematic review of the literature, to describe the benefits and results generated by the use of probiotics, prebiotics and/or synbiotics in adult patients with AD. Furthermore, this review aims to clarify the possible changes that this alternative therapy promotes on the microbial profile of these patients, as well as discussing improvements in the clinical status of patients.

Methodology

The methodology chosen for this systematic review was based on PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-analyses) [25]. The following questions were asked to serve as the basis for this review: What information is given in the scientific literature concerning the use of probiotics in adult patients with atopic dermatitis? Was there an improvement in the clinical status of the patients? Was there a change in the microbial profile in patients after using such approaches? Among the probiotics used, which was the most used in adult AD patients? What was the average time of these interventions? What were the outcomes?

Search strategy

A flowchart (Fig. 1) of the bibliographic survey was based on two virtual health databases: PubMed (MEDLINE) and the Latin American and Caribbean Health Sciences Literature (LILACS); the Scientific Electronic Library Online (SciELO), and the Google Scholar search portal. The Boolean operators (AND, OR and NOT) were used and the intersection with the following keywords for the search "atopic dermatitis", "probiotics", "prebiotics", "synbiotics" were previously verified by the MEDLINE Mesh. The inclusion criteria selected original articles, which addressed the AD theme only for adults, and where the title and abstract agreed with the proposed theme; only publications in Portuguese and/or English were accepted; publications and/or online availability were taken from the period January 2007 to June 2020. The exclusion criteria were studies with animal models; theses; books; dissertations; patents and literature and/or systematic reviews.

Fig.1
figure 1

Flowchart of selection process. Database search was performed from January 2007 to June 2020

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Population, intervention, control, outcomes (PICOs)

The population sample included patients aged 18 years or older with a diagnosis of AD who used probiotics. The Intervention was to evaluate the use of probiotics in adult patients with AD. The Control group consisted of systemically healthy adult patients without AD. The Outcomes reported were: (1) whether there was an improvement in SCORAD after treatment with probiotics in adult patients with AD; (2) if there was a change in the microbial profile after the use of probiotics in adult patients with AD; (3) the average time of interventions using probiotics.

Study selection and quality assessment

Two independent reviewers selected the studies by crosschecking the keywords (C.S.S and M.S.V). Titles and abstracts were independently evaluated by the two reviewers (C.S.S and M.S.V), and duplicate studies, patents and articles that used animal models were independently excluded. When there was any disagreement between reviewers, a third reviewer determined the inclusion or exclusion of the study (J.L.E.).

The data of the included articles were summarized, and the methodology of the articles was analyzed using quality assessment (Table 1), based on the criteria established by PRISMA. Thus, depending on their score, studies showed high (8–10 points—level A), medium (5–7 points—level B) or low (0–4 points—level C) methodological quality. In this systematic review, only studies classified as level A and B were included. The risk of bias was also independently assessed using appropriate tools following the study design.

Table 1 Quality assessment of the selected studies for systematic review
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The relevant findings of each selected study such as: first author, country and year of publication, database used, sample number, type of study, SCORAD, treatment used (probiotics) and route of administration were extracted from the original studies to build Table 2.

Table 2 Characteristics of the studies included in the systematic review
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The present review and the established criteria were based on the study previously published by Hulshof et al. [26].

Results

In the initial search, a total of 7651 articles were found: 634 articles from PubMed, 92 articles from LilaCs, 22 articles from Scielo, and 6903 articles from Google Scholar. After applying the above-mentioned inclusion and exclusion criteria, the Quality Assessment according to PRISMA was carried out, and articles at levels A and B were selected. Then any duplicate articles were excluded leaving 7 articles for the present review (Table 2).

In terms of design, all studies analyzed were clinical trials (7/7) with a divergent sample size ranging from 15 to 109 patients. The choice of intervention in all these studies was probiotics (7/7). Studies with the use of synbiotics and prebiotics were not identified within the criteria established. The usage of the probiotics ranged from 8 to 16 weeks, with a mean of 10.28 weeks (SD 3.15).

All selected studies used the oral route of administration; however, the presentation of the probiotics varied. As shown in Table 2, the different forms were powder, yogurt, sachets, capsules, probiotic drink, and fermented milk.

Most studies (6/7) used the SCORAD [27] index (Table 2) to classify the severity of AD. The only study that did not use SCORAD was that of Moroi et al. [28]. These authors verified the severity of the disease using the score established by the Japanese Dermatological Association. In their results, the authors found an improvement in the patient's clinical status in 8 weeks, the skin severity score was lower (p < 0.05), and there were further improvements in 12 weeks (p < 0.01) [28].

The study by Roessler et al. [29], who used the SCORAD index, observed that before starting the probiotic intervention, the mean clinical SCORAD of 15 patients with AD was 24.0 and when analyzed again after 8 weeks of probiotics showed a reduction in SCORAD to 15.5 (p = 0.081; 95% CI 17.0–23.6). The authors also observed an improvement in skin conditions after the 8-week probiotic intervention in 10/15 patients with AD [29]. Differently from the other selected studies, Matsumoto et al. [30] used the SCORAD index as an inclusion criterion for patients and not in the clinical evaluation after using the probiotic Bifidobacterium animalis subsp lactis (LKM512- B. lactis) [30]. Matsumoto et al. concluded that this probiotic was effective in reducing itching, and thus improving the quality-of-life score as well as improvements in the other AD symptoms [30]. The other studies in this review also confirmed a positive clinical evolution after treatment with probiotics, such as a reduction in SCORAD [31, 34, 35] and improvement in pruritus [30].

The Materials and Methods of the studies included numerous analyses. Most were blood analysis to evaluate Immunoglobulin E (IgE) in the serum and determine the Interleukins (IL-12, IL-4 and IL-5). In addition, the collection and analysis of feces was also carried out to analyze any changes in the microbiota after the administration of probiotics. This latter analysis was performed in five studies (5/7) [29,30,31,32,33] among which were: Roessler et al. [31] who investigated the fecal concentrations of Lactobacillus paracasei, Lactobacillus acidophilus and B. lactis, and found a significant increase in the concentration of L. paracasei and B. lactis during the period of probiotic administration. Matsumoto et al. [30] found that the B. lactis was significantly higher in the probiotic group compared to the placebo individuals [30]. Both these studies used real-time PCR to carry out this analysis [30, 31].

On the other hand, Drago et al. [32] carried out the investigation of bacterial species through conventional PCR and reported a statistically significant decrease of staphylococci in the stools of the group treated with the probiotic Lactobacillus salivarius LS01 (p < 0.05). This result suggests that this probiotic treatment may have an important role in the modulation of Thl/Th2 cytokine profiles and could be considered as an important adjuvant therapy in the treatment of adult AD [32].

In 2012, Roessler et al. [29] also analyzed bacterial species from the feces of patients with AD by quantitative PCR, in which the concentrations of short-chain fatty acids were measured using gas chromatography. The results showed that a probiotic supplementation provided a significant increase in lactobacilli, while the number of bifidobacteria and bacteroidetes remained unchanged. Although the fecal concentrations of short-chain fatty acids were not affected, fecal pH was significantly reduced from 7.0 to 6.6 in the AD patients after probiotic consumption.

Based on the subjects’ characteristics, the study by Roessler et al. [29] evaluated IgE, macrophage-derived chemokine (MDC) and IL-16 in patients with AD and compared these results with healthy subjects. The authors verified that these data were significantly elevated in patients with AD compared with the healthy subjects. Regarding diet, the dietary fiber uptake of AD and healthy subjects remained stable during the study [29]. In the other hand, Drago et al. [32] study mentioned clinical and epidemiological data of patients enrolled in probiotic and placebo treatment group. Some patients of these groups presented: respiratory allergy (14/19 patients of the placebo group; 16/19 patients of the probiotic group); food allergy (9/19 patients of the placebo group; 3/19 patients of the probiotic group); and serum IgE (919.71 ± 369.08 of the placebo group; 579.14 ± 253.63 of the probiotic group). Moroi et al. [28] study indicated the skin severity scores in both groups: Lactobacillus paracasei K71 (LAB diet group) and placebo group in different locations (head and neck, anterior trunk, posterior trunk, upper and lower limbs), but did not mention any epidemiological data of these patients [28]. Kaur et al. [33] evaluated AD patients that suffered from AD in their early childhood. The authors reported some data of the patients like family history of atopy (2/16) and presence of concomitant asthma and AD (1/16) in a few patients. Roessler et al. [29], Matsumoto et al. [30] and Fang et al. [41] did not mention any clinical and epidemiological data of patients enrolled in their study [29, 30]. Other important aspects of the selected studies are described in Table 3.

Table 3 Severity index, number of patients and use of topical treatments of the studies included in the systematic review
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Discussion

Several studies have pointed to probiotic therapy as an alternative for the treatment of AD. This is because probiotics can modify the intestinal microbiota early in pregnancy and influence the development of adaptive immunity. In addition to these factors, they have immunomodulatory effects, which allow their use to be aimed at patients with AD who have low microbial diversity in the intestine during the first months of life [34,35,36].

This review obtained few findings in the literature, since testing of probiotics is more common in children and infants than in adults [35, 37,38,39]. The use of probiotics in children is more studied than in adults since the digestive tract of children is colonized by anaerobic bacteria, which can prevent allergic disorders [40]. The effect of probiotics on the intestinal composition of children is related to immature immune system, which can be more difficult in AD adult-type with a matured immune system. The symptoms of AD in adults can be alleviated by cell components presented in probiotic bacteria [30].

Another systematic review carried out previously by Hulshof et al. [26] selected 14 articles to assess the effect of dietary interventions with pre- and/or probiotics and synbiotics for the treatment of AD in children diagnosed with AD from 2008 to 2017. This review differs in several respects when compared to the present study, especially for the different type of sample evaluated (evaluation of children), and for having included studies investigating the topical administration route of probiotics, synbiotic and prebiotics.

On the other hand, like the present study, most studies (12/14) selected by those authors used the SCORAD index to assess the severity of AD. In their results, 3 out of 5 studies that used synbiotic intervention reported a reduction in AD severity after the dietary intervention compared to the control diet. This result was like the treatments that used probiotics, where there was an improvement in AD severity in 3 out of 4 studies. Hulshof et al. [26] observed that the effective administration time for dietary intervention with prebiotics, synbiotics and probiotics remains uncertain, and may vary from 8 to 24 weeks. Consequently, this may indicate that there is no association between the duration of the dietary intervention and the outcome of clinical improvement in AD [26]. In the present review, the time of consumption of probiotics ranged from 8 to 16 weeks.

Most of the studies in this present review described effective and beneficial results with probiotic treatments [28, 31,32,33, 41]. Drago et al. [32], in 2011, demonstrated a significant improvement in SCORAD (p < 0.0001) in adult AD patients with L. salivarius LS01 taken orally twice daily. The probiotic was in sachets in powder form to be dissolved in water or another liquid according to the patient's preference, for 16 weeks. In their results, the authors observed a reduction in staphylococci in feces after the treatment with probiotics [32]. However, the study by Roessler et al. [31] after 8 weeks did not find any significant improvement of SCORAD (P = 0.081) in patients treated with a combination of probiotics (L. paracasei Lpc-37, L. acidophilus 74–2 and B. lactis DGCC 420 [B. lactis 420]). However, this supplementation as a probiotic drink significantly increased the total number of fecal lactobacilli in both groups and a high number of L. paracasei and B. lactis was found, demonstrating good colonization of these organisms in the intestinal microbiota [31]. This difference in results between the two studies may be related to the different probiotics used as well as the period and strain used [42, 43].

A relevant factor to be considered in AD patients is the balance in the intestinal microbial composition, as these individuals tend to dysbiosis, especially favoring pathogenic microorganisms. There is evidence that probiotic bacteria can mediate beneficial effects by modifying the intestinal microbiota and its metabolic activity. Therefore, a supplemented mixture of probiotics can affect the peripheral immunological parameters, and relieve skin symptoms in patients with AD [44, 45]. However, Nutten [44] reported that despite the literature showing satisfactory results, there are still divergences regarding the use of probiotics in patients with AD as there is no standardization regarding the species of probiotics used, their dosages, time of use and the use of combined therapies [45, 46]. Thus, further research is needed to clarify the effectiveness of prebiotics and/or probiotics in improving the clinical status, as well as lead to a reduction of SCORAD in adult AD patients.

Four of the selected articles [32, 33, 41, 47] reported an improvement in SCORAD with the use of probiotics. The study by Moroi et al. [28] did not use the SCORAD as a criterion; however, they observed a reduction in the score of the Japanese Dermatological Association after the 8th and 12th weeks of patients undergoing treatment with conventional topical corticosteroids and tacrolimus. These authors analyzed stable symptomatic patients who used L. paracasei K71 powder dissolved in 100 ml of water once a day in their diet. The authors described that, symptomatic changes were assessed primarily by skin severity scores and secondarily by itching and impaired quality of life (QL) scores, collected at baseline and during weeks 4, 8, and 12 after the start of the intervention. In contrast, Kaur et al. [33] used a different methodology from other trials, where the patients, who were using emollients, consumed goat milk fermented with the antioxidative probiotic Lactobacillus fermentum. In addition to biochemical blood tests, they performed skin biopsies (4 mm) from the patients' backs before and after the study. The authors reported an improvement in skin condition, a decrease in SCORAD, and a reduction in oxidative stress in the skin and blood according to the oxidative stress marker (OxS) in their patients [33].

The study by Matsumoto et al. [30] was the only one that found an improvement in pruritus of the patients treated with the probiotic B. lactis LKM512 [30].

Roessler et al. [39], as presented in this review, used a probiotic drink containing Streptococcus thermophilus, enriched with L. paracasei Lpc-37, L. acidophilus 74–2 and B. lactis DGCC 420 for 8 weeks for adult AD patients. However, they did not observe an improvement in SCORAD or in the condition of the patients, and only reported an increase in fecal lactobacilli and a reduction in fecal pH with the supplemented probiotics [39].

Fang et al. [41] analyzed the microbial diversity by sequencing the next generation of the V3 and V4 regions of the 16S gene with the Illumina platform using the stool from patients with AD and their control group after 8 weeks of treatment with the probiotic Lactobacillus plantarum CCFM8610. The result of the sequencing analysis of the samples detected 23 phyla, of which four represented more than 98%. These four were Firmicutes, Actinobacteria, Bacteroidetes and Proteobacteria, with a predominance of Bacteroidetes (84%) and Firmicutes (86%). After the 8-week intervention, the relative abundance of the four phyla showed no variation between groups. However, in terms of the genus, there were changes in the intestinal microbiota. Before the intervention, there was a predominance of Bacteroides and Blautia in all groups; after the intervention, Bacteroides spp., Prevotella spp., Lachnospiraceae and Ruminococcaceae were dominant. In addition to these changes observed in microbial diversity, the authors also found a reduction in the SCORAD index, an improvement in the quality of life of patients and an increase in the expression of IL-10 in patients with AD, after the administration of the probiotic. Also, this approach was effective in preventing worsening skin condition of atopic dermatitis patients [41].

The studies that have used prebiotics in vivo and in vitro, have demonstrated an increase in the expressions of IL-10, IFN-γ, IgA and TGF-β [48, 49]. Furthermore, prebiotics are understood to induce the production of lactic acid in Bifidobacterium and Lactobacillus. Lactic acid has immunomodulating effects, and its fermentation by such microbial genera produces short-chain fatty acids, such as acetate, butyrate, and propionate. These metabolites serve as an energy source for colonocytes and are putative candidates for leukocyte ligands [50].

In addition to probiotics and prebiotics alone, synbiotics are combinations of prebiotics and probiotics, in which there is stimulation of the latter by the former [51, 52]. Although none of the studies evaluated in this review used synbiotics in their therapeutic approach with adult AD patients, there are some studies in literature that address the use of synbiotics in children with AD, but present conflicting result [53,54,55].

In general, probiotics have numerous advantages, as they can be targeted to treat health conditions, control gastrointestinal diseases as well as help lose weight. Despite these advantages, the FDA (Food and Drug Administration) has not yet provided guidelines or recommendations for the use of probiotics. However, for AD, a specific protective effect of probiotics in primary prevention has been observed over a long follow-up period, especially in children and during pregnancy [56].

Conclusions

Even though various clinical trials have been carried out with the most diversified methodologies and different probiotic strains, their results are still conflicting, especially in terms of clinical improvement in adult patients with atopic dermatitis. In general, our analysis showed that probiotics demonstrate a fair ability to relieve symptoms of atopic dermatitis in adult patients reducing pruritus and decreasing SCORAD index.

Availability of data and materials

Not applicable.

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Acknowledgements

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Funding

This work was supported by FAPERJ (Fundação de Amparo a Pesquisa do Estado do Rio de Janeiro) under grant [E-26/203.296/2017].

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Authors and Affiliations

  1. Faculty of Dentistry, Centro Universitário Universus Veritas, Rio de Janeiro, Brazil

    Camila Stofella Sodré

  2. Faculty of Dentistry, Universidade Veiga de Almeida, Rio de Janeiro, Brazil

    Mayra Stambovsky Vieira

  3. Department of Clinical Medicine, Universidade Federal do Rio de Janeiro- UFRJ, Rio de Janeiro, Brazil

    Juliany Lima Estefan

  4. Faculty of Dentistry, Universidade Estácio de Sá, Rio de Janeiro, Brazil

    Cristiane Moraes & Dennis de Carvalho Ferreira

  5. Universidade Federal do Rio de Janeiro (UFRJ) - Campus Macaé, Rio de Janeiro, Brazil

    Fernanda Sampaio Cavalcante

  6. Microbiologia Paulo de Góes Institute, Universidade Federal do Rio de Janeiro - UFRJ, Rio de Janeiro, Brazil

    Kátia Regina Netto dos Santos

  7. Faculty of Dentistry, Universidade Veiga de Almeida, Rio de Janeiro, Brazil

    Dennis de Carvalho Ferreira

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  1. Camila Stofella Sodré
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Contributions

D.C.F. conceived the study. C.S.S. and M.S.V. performed the literature search, the data extraction and analysis. C.S.S., M.S.V., D.C.F. and J.L.E. wrote the draft manuscript. C.M. and F.S.C. performed a critical appraisal. K.R.N.S. and D.C.F. revised and approved the final version of the manuscript. All the authors agreed with the submission for publication. CSS: investigation, methodology, formal analysis, data curation, writing—original draft. MSV: methodology, formal analysis, data curation, writing—original draft, software. JLE: data curation, writing—original draft, software. CM: visualization, software. FSC: visualization, writing—review and editing. KRNdS: writing—review and editing, Validation. DdCF: conceptualization, funding acquisition, writing—original draft, supervision, project administration, resources, writing—review and editing, Validation. All authors read and approved the final manuscript.

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Correspondence to Camila Stofella Sodré.

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Sodré, C.S., Vieira, M.S., Estefan, J.L. et al. The effect of probiotics on the clinical status of adult patients with atopic dermatitis: a systematic review. Eur J Med Res 27, 94 (2022). https://doi.org/10.1186/s40001-022-00713-z

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European Journal of Medical Research

ISSN: 2047-783X

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