Infectious Diseases: Prevention and Control

Infection Prevention 2018: Staphylococcus aureus infections in psoriasis plaques

Violeta Ionescu

Introduction: Psoriasis is an inflammatory condition of the skin, of which chronic plaque psoriasis is the most common form (1). Psoriasis is associated with alteration in the composition of skin bacterial biota (2). Staphylococcus aureus (3), group A Streptococcus, and Streptococcus pyogenes are involved in psoriasis pathogenesis in genetically predisposed individuals (2, 4-6). S. aureus colonization of lesional skin was associated with a significantly higher PASI (Psoriasis Area Severity Index) score, even more, evident when isolated strains were toxigenic (5, 7). Methodology: This study aimed to investigate the prevalence of infections with pathogenic bacteria in psoriasis plaques. For this purpose, randomly selected patients with plaque psoriasis were tested for bacterial infections in skin lesions using conventional microbiological methods. Results: S. aureus was cultivated in 75 of the 205 samples (36.6%), while methicillin-resistant S. aureus (MRSA) was identified in 45 of 205 samples (21.9%). Other Gram-positive and Gram-negative cocci and bacilli were cultivated from psoriasis plaques: Staphylococcus spp. (representing coagulase-negative staphylococci S.Co.N.) in 122 samples (59.5%), Bacillus/Paenibacillus spp. in 58 samples (28.3%), and Streptococcus spp. in 25 samples (12.2%), Enterobacteriaceae in 19 samples (9.3%) (of which Klebsiella spp. was present in 4 samples, Enterococcus spp. in 3 samples, and Escherichia coli in 2 samples, representing 2%, 1.5%, and 1%, respectively), Enterococcus spp. in 14 samples (6.8%), non-fermenting bacteria in 14 samples (6.8%) (Including Pseudomonas aeruginosa which was cultivated in 2 samples, 1% respectively), and Corynebacterium spp. in 7 samples (3.4%). Conclusion: Gram-positive bacteria were the most frequently found bacteria in psoriasis plaques. Of them, S. aureus was the most prevalent, represented especially by MRSA strains. This study is intended as a warning about the necessity of evaluating bacterial infections in psoriasis plaques, in order to clarify the connection between skin infection and onset or worsening of psoriasis pathology.

The fuel of Psoriasis Vulgaris can be brought about by different triggers.1) While bacterial penetration of beset skin is known to be a trigger factor in incessant incendiary dermatoses, for example, atopic dermatitis,2) the bacterial vegetation of psoriasis plaques, and their conceivable significance have gotten just a little consideration so far.


The bacterial smears of lesional skin performed routinely on admission to our center were analyzed reflectively for all psoriasis patients. The perception time frame was 16 months. The information of n=98 inpatient medicines (n=73 patients) was evaluated, whereby n=56 patients were dealt with once, n=12 patients twice, and n=5 patients experienced rehashed in-understanding medicines. In general, n=45 (46% of all psoriasis cases) had colonization of the psoriasis plaques with pathogenic microscopic organisms, whereby gram-positive microorganisms were discovered most much of the time. Of these patients with pathogenic colonization, n=22 had one pathogen, while n=18 of those analyzed had two microorganisms and n=5 three or four unique microscopic organisms. The most predominant bacterium was Staphylococcus aureus (n=31). Clinically, the plaques secured with neurotic bacterial vegetation were to some degree erosive. The PASI on affirmation for patients with obsessive colonization was 16.1 versus 14.0 in patients without confirmation of bacterial colonization or inhabitant greenery (not critical (t-Test)). The patients conceded at least multiple times indicated a change in bacterial colonization in eleven cases with no standard example. There was a change between gram-positive and gram-negative colonization, just as new colonization of beforehand sterile plaques with different pathogenic microbes. Notwithstanding, in three cases, colonization with Staphylococcus aureus was not, at this point present on re-affirmation (sterile finding for each situation). These three patients didn't get any antimicrobial treatment between their in-house medicines. One lady created erysipelas of the stomach divider out of a navel plaque with colonization by Staphylococcus aureus.


In many patients, the pathogens show up as (transient) colonization or superinfection. This is upheld by the absence of contrast in the PASI scores on confirmation and the changing verdure in patients conceded more than once. In any case, bacterial colonization may have fundamental and neighborhood impacts. For instance, a superantigen impact has been depicted in psoriasis particularly for Staphylococcus aureus, the most-every now, and again discovered bacterium. Enterotoxins appear to assume a significant job in this superantigen activity. Moreover, the activating of psoriasis by Streptococci is known. On the other hand, neighborhood consequences for single colonized plaques may be conceivable, since the clinical picture with crusting and erosive surface demonstrates a resistant reaction. Nearby diseases of psoriasis plaques are normally forestalled by high centralizations of antimicrobial peptides. Nonetheless, this obstruction is by all accounts penetrated in single cases. In the gathering of patients, we analyzed, one lady created erysipelas which started clinically in the territory of a psoriasis plaque. This shows fundamental diseases from neighborhood bacterial colonization couldn't be forestalled in singular cases disregarding an overexpressed natural resistant framework in psoriasis.


Psoriasis affects some 7 million adults within us. These effects could also be immunosuppressing and increase the danger of infection in other ways,” consistent with Mr. Hsu and his associates. For their study, they analyzed data for 2002-2012 from the Nationwide Inpatient Sample, which covers 20% of hospitalizations in the United States. They extracted validated ICD-9 codes for psoriasis and high infections, and calculated costs of care after adjusting for 2014 inflation, supported us Consumer price level.

Furthermore, after controlling for age, sex, and race, psoriasis was a big risk factor for several different types of great infections. Among these were cellulitis, herpes simplex virus, infectious arthritis, osteomyelitis, meningitis, influenza, encephalitis, septicemia, enterocolitis, MRSA, methicillin-sensitive Staphylococcus aureus infections, and Clostridium difficile. The average cost of hospital stay for inpatients with psoriasis was quite $2,200 greater once they were diagnosed with one or more serious infections than otherwise, and their average length of hospital stay was 2 days longer.


In our investigation, we have uncovered that the level of S. aureus colonization was altogether higher in the control skin than in the lesional psoriatic skin (27.3% versus 3%) OR=0.08 IC95% (0.01-0.70) (p=0.02). In this way, the psoriasis is a defensive factor against skin S. aureus colonization. This distinction was at that point revealed by Fahlen et al in 2012 who contemplated the appropriation of bacterial microbiota in typical and psoriatic skin. In that review, this bacterial microbiota was increasingly significant in ordinary skin contrasted and psoriatic skin. Also, Staphylococcus in the two appendages and trunk was increasingly bottomless in control bunch skin contrasted and psoriasis bunch skin. They recommended that this distinction was infection-related and that psoriasis could ensure against bacterial colonization. In another investigation looking at S. aureus disease and antimicrobial peptides in patients with atopic dermatitis, psoriasis, and in ordinary subjects; the creators featured the job of antimicrobial peptides in intrinsic invulnerability of human skin and in the capacity of the skin to oppose bacterial contamination. They clarified that Cathelicidins (LL-37) and defensins (HBD-2) having a place with this antimicrobial peptides family add to have to safeguard against S. aureus.

The aftereffects of this examination indicated a fundamentally lower articulation of HBD-2 mRNA and LL-37 mRNA in atopic sores than in psoriatic injuries (P=0.009 and P=0.02, separately). The mix of LL-37 and HBD-2 demonstrated synergistic antimicrobial movement by successfully slaughtering S. aureus. They presumed that a lack of the outflow of antimicrobial peptides may represent the powerlessness of patients with atopic dermatitis to skin contamination with S. aureus. The antimicrobial peptides HBD-2 and LL-37 are typically delivered by keratinocytes in light of fiery upgrades, for example, psoriasis or injury. Their high articulation in psoriasis skin decreases the danger of skin contamination and skin colonization with S. aureus. During the investigation, we have additionally discovered that S. aureus colonization was less significant in non-lesional psoriatic skin (12.1%) than in control skin (27.3%) anyway the thing that matters was not noteworthy (p= 0.13). It has as of late been accounted for that the skin vegetation differs relying upon the site from which the examples are taken. The creators isolated the body surface into three gatherings: sebaceous, clammy, and dry and found that bacterial burden differed inside these skin locales. In any case, in our examination, all skin biopsies of non-lesional psoriatic skin and control skin were taken from the back. Subsequently, the distinction between S. aureus skin colonization in non-lesional psoriatic skin and control skin isn't identified with the site of skin biopsy, but instead to antimicrobial peptides creation. These outcomes are in accord with discoveries by Peck and al who affirmed the nonattendance of HBD-2 and LL-37 in typical skin contrasted and psoriatic skin. These antimicrobial peptides are up-directed under provocative conditions, for example, psoriasis.