Michael Kaiser; Joel Gil, BS; Ryan Treu, BS; Jose Valdes; and Stephen Davis, BS
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1 An In vitro Analysis of the Effects of Various Topical Antimicrobial Agents on Methicillin-resistant and Methicillin-sensitive Strains of Staphylococcus aureus Michael Kaiser; Joel Gil, BS; Ryan Treu, BS; Jose Valdes; and Stephen Davis, BS Abstract Infections of acute and chronic wounds have a substantial negative impact on patient outcomes. Because bacterial resistance to traditional antimicrobials continues to increase, an in vitro study was conducted to eamine current sensitivities of various methicillin-resistant and methicillin-sensitive strains of Staphylococcus aureus (MRSA and MSSA) to commonly used topical antimicrobial agents. Using fresh cultures of eight strains of MRSA and MSSA, the area of the zone of inhibition produced by various topical antimicrobials, including an aminoglycoside antibiotic, monocarboylic acid antibiotic, pleuromutilin antibiotic, triple antibiotic ointment, and petrolatum ointment, was eamined. Si culture plates per antimicrobial were prepared using the Kirby Bauer method; soy blood culture plates were inoculated with the bacteria, incubated for 24 hours at 37 C, and their zones of inhibition measured and calculated. Data were analyzed using ANOVA testing. Mupirocin treatment was the most effective antimicrobial, with areas of inhibition ranging from cm 2 to cm 2 (P <5), as compared to the net most effective, retapamulin, with areas of inhibition ranging from cm 2 to cm 2. This study provides current scientific data to help the development of a thoughtful rationale for the use of topical antimicrobials in wounds. Additional in vivo studies to substantiate these findings are needed. Keywords: Staphylococcal skin infection, methicillin-resistant Staphylococcus auerus, drug resistance, bacteria, wound Inde: Ostomy Wound Management 2014;60(4):18 28 Potential Conflicts of Interest: none disclosed Acute and chronic wounds have an enormous economic and social impact and are a substantial and increasing burden on healthcare systems. 1 Chronic wounds affect 6.5 million individuals in the United States, and the incidence of these wounds is epected to increase rapidly with an aging population. 2,3 The costs associated with the treatment of chronic wounds are equally as staggering. In the United Kingdom, the costs to the National Health Service are estimated to be 1 billion per year, while in the US ependitures for the treatment of chronic wounds are approimately $25 billion per year. 1,4,5 A plethora of research has been conducted to find methods that will facilitate healing of chronic wounds with the aim of decreasing mortality, morbidity, and cost. One of the most common factors implicated in delayed wound healing is the presence of bacterial infection. 6 A prospective study 3 of leg ulcer microbiology and a review article 7 on the role of microbes in chronic wounds show polymicrobial flora contributes to nonhealing. The tissue in chronic wounds is at increased risk for bacterial invasion due to poor vascular supply and systemic, patient-specific factors that include advancing age, diabetes mellitus, obesity, malnutrition, and the use of steroid and other immunosuppressant therapy. 3,8,9 Multiple retrospective and prospective studies encompassing more than three decades of research have demonstrated Staphylococcus aureus is the dominant species isolated from skin infections, including chronic and acute wounds Colsky et al 11 retrospectively reviewed the bacterial wound cultures obtained from hospitalized dermatology patients; S. aureus accounted for 77% of the isolates in superficial skin At the time this manuscript was developed, Mr. Kaiser was a research assistant, Department of Dermatology and Cutaneous Surgery, University of Miami, Miller School of Medicine, Miami, FL. Mr. Gil is a laboratory manager; Mr. Treu is a research associate; Mr. Valdes is a research assistant; and Prof. Davis is a research professor, Department of Dermatology and Cutaneous Surgery, University of Miami, Miller School of Medicine. Please address correspondence to: Prof. Stephen Davis, Department of Dermatology and Cutaneous Surgery, University of Miami, Miller School of Medicine, PO Bo (R-250), Miami, FL 33101; sdavis@med.miami.edu. 18 ostomy wound management april
2 Topical antimicrobials and MRSA/MSSA wounds and 43% (not a majority, but still the most common) among bacteria in chronic leg ulcers. For the past 60 years, the incidence of S. aureus infection has been increasing. Along with this increase has come biochemical changes in this bacterial pathogen, leading to increased resistance to antimicrobial agents. According to an etensive review, 13 this was noted as early as 1944 when the first isolates resistant to penicillin appeared. Additional reports of resistance to methicillin as well as other antimicrobials followed in the 1960s The first and original report of methicillin (celbenin) resistance was a letter to the editor 14 ; an associated letter 15 that discussed the degree of resistance of single colony strains and the original cultures quickly followed. Subsequent testing revealed an etremely high degree of resistance with prolonged incubation. An in vitro analysis 16 of more than 60,000 cultures documented the number of methicillin-resistant S. aureus (MRSA) cultures and their slow increase over the course of a 3.5-year study and analyzed the sources and screening methods for methicillin resistance. Increasing antibiotic resistance also has been seen in chronic wounds and acute wounds. In 2004, a retrospective chart review by Valencia et al 12 found as many as 75% of all S. aureus isolates from dermatology inpatients with leg ulcers and 44% of all S. aureus isolates from superficial chronic wounds were MRSA. Previously, the rate of MRSA infection in this same inpatient dermatology unit showed MRSA to be present in 26% and 50% of acute and chronic leg ulcers, respectively. Similarly, MRSA was present in 7% and 24% of superficial acute and chronic wounds, respectively. It is known that with increased rates of infection and required treatment there is an increase in resistance to antimicrobials. With the development of methicillin resistance in S. aureus bacteria, other antimicrobial agents should be considered. Mupirocin, a common topical antimicrobial agent, has shown effectiveness against MRSA as well as methicillinsensitive S. aureus (MSSA) in both clinical and animal trials. 17 Although some over-the-counter products eg, Neosporin (Johnson & Johnson, Trenton, NJ) also have shown efficacy against S. aureus in infected porcine wounds, head-tohead studies against both MRSA and MSSA are needed. 17 The purpose of this in vitro study was to eamine current sensitivities of both MSSA and MRSA to commonly used topical antimicrobial agents. Characterization of antibiotic sensitivities may be useful in developing effective strategies for reducing colonization of, and infection with, these bacteria, which may speed healing of wounds, thereby decreasing morbidity and costs. Materials and Methods Bacterial strains. Because S. aureus is a genetically sophisticated bacterium notorious for its ability to adapt to almost any antibiotic challenge, multiple different strains of MRSA and MSSA were eamined. Commercially available strains were chosen to best represent a broad and realistic spectrum Ostomy Wound Management 2014;60(4):18 28 Key Points The presence of antibiotic-resistant Staphylococcus aureus in and outside of healthcare facilities continues to increase. Using an in vitro model, the authors tested the ability of several strains of antibiotic-resistant S. aureus to resist commonly used topical antibiotics. Nonprescription, more commonly used topical antimicrobials were found to have the least effect on these bacteria. Additional studies are needed to help develop evidence-based protocols of care for the use of topical antimicrobials in acute and chronic wounds. of the cutaneous S. aureus clinical eperience in the US. This study used fresh cultures of MRSA isolates (USA300, ATCC 33591, 33593, , and AD2A[5]) and MSSA isolates (14776, 6538, and AD4A[7]). Freeze-dried bacterial cultures were recovered according to the standard American Type Culture Collection recovery protocol. All of the challenged inoculum suspensions were prepared by scraping the overnight growth from a culture plate into 20 ml of phosphate buffer solution. Serial dilutions of this suspension were made to create an inoculum suspension of approimately 10 6 colony-forming units per ml (CFU/mL). This concentration was confirmed using historical optical density measurements. Antimicrobial susceptibility testing. Antimicrobial susceptibility testing usually starts with various in vitro assays. For this study, a modified Kirby Bauer method was used that consists of an agar well diffusion assay. 18 The antimicrobial agents evaluated in this study were gentamicin sulfate 0.1% ointment (E. Fougera & Co, Melville, NY); Neosporin brand triple antibiotic ointment (TAO), containing neomycin, polymiin, and bacitracin (Johnson & Johnson, Trenton, NJ); mupirocin 2% ointment (Taro Pharmaceuticals, Brampton, Ontario, Canada); and retapamulin (Altaba ointment, Glao Smith Kline, Research Triangle Park, NC). Target brand Petrolatum Ointment (Target Corp, Minneapolis, MN) was used as a control to verify that the changes in bacterial growth were a result of the active antimicrobial agent and not due to the vehicle for the agents. A 100-μl aliquot of the 10 6 CFU/mL inoculum suspension was plated onto trypticase soy agar with 5% sheep blood (Becton Dickinson and Company, Sparks, MD). Sterile glass beads were used to spread the inoculum evenly over the surface of the agar in order to grow a continuous lawn of bacteria. The topical antimicrobial agent (150 mg) was placed into a round, central, 10-mm well created by removing a portion of the inoculated culture media using a 10-mm skin punch biopsy. A group of si culture plates was created to evaluate April 2014 ostomy wound management 19
3 Figure 1. Staphylococcus aureus area of Inhibition zone (cm 2 ) with different antibiotics. each antimicrobial against all of the eight strains of S. aureus in this study. All culture plates were incubated at 37 C for 24 hours. Data collection and analysis. To determine the efficacy of the topical antimicrobial against each S. aureus strain, the area of the zone of bacterial growth inhibition was measured using Image J 1.44p software ( The average area of growth inhibition for the si plates in each treatment/strain group was calculated. Statistical analysis using an ANOVA test was used to determine significant differences between treatments. Significance was considered when the P value was 5. Results Mupirocin treatment was the most effective antimicrobial, with areas ranging from cm 2 to (P <5, see Figure 1). Retapamulin, the second most effective antimicrobial, had areas of inhibition ranging from cm 2 to cm 2 ; it was significantly more effective at inhibiting bacterial growth than gentamicin sulfate, TAO, and the petrolatum control (P <5). The areas of the zone of mupirocin-induced inhibition are more than twice those of retapamulininduced inhibition. TAO was significantly more effective than the petrolatum control against MSSA 6538 and MSSA AD4A(7) (P <5). The two strains most sensitive to mupirocin compared with all other strains eamined were MRSA and MSSA (P <5, see Figures 2a and 2b). MRSA and MRSA AD2A(5) were the most sensitive to retapamulin treatment. The MSSA 6538 and MSSA AD4A(7) strains were least affected by mupirocin and retapamulin treatment. Of all the MRSA strains evaluated, MRSA USA300 demonstrated the smallest area of growth inhibition by both mupirocin and retapamulin. TAO and gentamicin treatments showed relatively small areas of bacterial growth inhibition across all of the strains evaluated, consistent with their significantly lower inhibition of bacterial growth (see Figures 2c and 2d). All strains in the gentamicin group were significantly inhibited relative to MRSA and MRSA (P <5). These two strains, with areas of growth inhibition near zero, are the only strains in this study that were found to be resistant to gentamicin. Discussion Wound healing is an intricate process with many factors that can lead to delays in healing. Bacterial presence in wounds can be an important cause of problems in patients with chronic wounds. 19 The presence of bacteria in chronic wounds occurs in varying degrees, from asymptomatic contamination to colonization to local infection, increasing to invasive infection and septicemia. 20 It is the interaction between the patient and the bacteria present in the chronic wound that determines the degree of healing or infection, and therefore the need for treatment. 3,21,22 Numerous studies have shown the most common bacterium present in chronic and acute wounds is S. aureus. 12,23 Over recent past decades, there has been a disturbing trend toward increasing antibiotic resistance of MRSA, accounting for up to 75% of S. aureus isolates. 11,23 MRSA is now in many US healthcare facilities and communities. In 2003, Pan 20 ostomy wound management april
4 Mupirocin 2% treatment a Retapamulin 1% treatment b Neosporin treatment 2.63 Figure 2. a. P <5 compared to MRSA 33593, USA3000 and MSSA 6538, AD4A(7) P <5 compared to MRSA USA300 and MSSA 6538, AD4A(7) P <5 compared to MSSA AD4A(7) b. P <5 compared to MRSA USA300 and MSSA 6538, AD4A(7) P <5 compared to MSSA 6538, AD4A(7) c. P <5 compared to MRDA , USA300, AD2A(5) and MSSA 14776, 6538, AD4A(7) P <5 compared to MRSA d. P <5 compared to all strains P <5 compared to MRSA 33593, , USA300, AD2A(5) and MSSA 14776, 6538 P <5 compared to MRSA 33593, and MSSA 14776, 6538 P <5 compared to MRSA 33593, and MSSA 6538 P<5 compared to MRSA 33593, c Gentamicin sulfate 0.1% treatment d 22 ostomy wound management april
5 et al 24 retrospectively reviewed 295 San Francisco County jail inmate health records that showed 74% of S. aureus isolates obtained were MRSA. This correlates with Valencia et al s retrospective review of patients at a Miami, Florida inpatient dermatology unit, showing MRSA to be present in 36 out of 48 patients (75%) S. aureus isolates from leg ulcers. A prospective study in Copenhagen 23 found S. aureus to be the most common isolated bacterium (93.5%) in chronic venous ulcers. The current in vitro study eamined multiple strains of MRSA and MSSA, including the MRSA USA300 strain. Currently, USA300 is the most common strain of MRSA isolated in the US and persists in community populations in at least 16 states Other strains eamined in the current study are commonly used in testing the effectiveness of antimicrobial hand-washing formulations (MRSA 33591, MSSA 6538). MSSA 6538 also is used in a wide variety of commercial testing, including filtration efficiency testing, media testing, and antimicrobial and antiseptic testing. MSSA is used in World Health Organization International studies to standardize antibiotic sensitivity disks. The in vitro effectiveness of the topical antimicrobials evaluated in this study correlates with the known antibiotic susceptibilities of the strains evaluated. For eample, MRSA and MRSA , which are known to be resistant to gentamicin, had inhibition zone areas of nearly zero, not significantly different from that of the petrolatum control. Furthermore, the results seen in this in vitro study also correlate with the reputation of S. aureus remarkable ability and history of decreasing susceptibility to antibiotics with increasing eposure. The results from this study are in agreement with those of the in vitro study by Suzuki et al, 29 where the USA300 strain was found to be resistant to TAO. The newer antibiotics mupirocin and retapamulin used in this study had significantly and far larger areas of bacterial growth inhibition than TAO, which has been in use for many years. Furthermore, the use of mupirocin and retapamulin is not as common as TAO in the US because they are restricted ie, controlled agents requiring a prescription to acquire and use. Suzuki et al 29 also concluded that TAO resistance occurs to a greater degree in MRSA strains in the US where TAO is widely used. This is in contrast to MRSA strains in Japan where the use of TAO and its components is not widespread. The greater sensitivity ehibited in this study by these eight strains of S. aureus to mupirocin and retapamulin is consistent with less eposure of these strains to these antimicrobials. Bacterial growth inhibition to these common topical antimicrobials occurred regardless of methicillin susceptibility. This would be epected, given the unique and different mechanisms of action of each antimicrobial agent from that of methicillin. The ability of infections to slow the healing of both acute and chronic wounds, prolong hospital stays, and increase morbidity and the cost of these wounds is well known In a retrospective study 31 of 51 patients (17 colonized with MRSA, 34 control), patients with MRSA had longer hospital stays and increased incidence of negative post op outcomes compared to patients without MRSA. A prospective study 32 of 59 venous ulcer patients found S. aureus was present in 94.9% of ulcers, compared to 5.1% of patients who were S. aureus free, significantly delaying time to healing. A summary of the literature contained in an in vitro study of the effectiveness of silver-containing products against bacteria 33 underscores the role of infection on increased patient debilitation and healthcare costs. Some antimicrobial agents such as iodine in aqueous solution are rapidly consumed in the wound milieu, while the presence of increasingly resistant bacteria may render topical antibiotics in low concentrations ineffective A review 36 of their role, particularly in diabetic foot ulcers, suggests biofilms pose greater challenges to the effectiveness of topical antimicrobials in chronic wounds; primarily, it is difficult for the antimicrobial to penetrate the biofilm in a sufficient concentration to kill bacteria. The data from the current in vitro study indicate the bacterial growth of both MRSA and MSSA is more affected by mupirocin and retapamulin than by TAO and gentamicin. Judicious use of all of these agents is needed to reduce the likelihood for the development of resistance. Perhaps the use of these common topical antibiotics that can be delivered in a sustained fashion in conjunction with a topical antiseptics, and subsequently have an immediate effect on bacteria, may be more effective against bacteria. 36 This combination may prevent the development of resistance to the antibiotic agent. Furthermore, the antiseptic may disrupt the biofilm and allow greater penetration of the antibiotic, while also having a bactericidal action against a bacterium such as MRSA. 31,33 Whether acute or chronic, superficial or deep, skin wounds that are critically colonized with bacteria require diligent wound care to prevent the progression of colonization to varying degrees of infection. Cleansing, debridement, and the use of topical agents and antimicrobials may be needed as important elements in managing acute and chronic wounds. Limitations Because these evaluations were performed in vitro, this study has inherent limitations. In addition to in vitro studies, in vivo analyses also should be conducted because diffusion assays may only partly reflect the ability of the active agent to diffuse through the agar as opposed to killing bacteria colonized within wounds. In vivo evaluations also would facilitate assessment of these active agents against important factors in the wound environment that could influence their activity eg, ph, temperature, proteases, growth factors, and other characteristics. Conclusion Bacterial resistance to antimicrobial agents is a constant concern and is continuously evolving. This is evident from 24 ostomy wound management april
6 the increasing frequency of multidrug resistance in S. aureus since the early 1990s. Although the increasing prevalence of antibiotic resistance is well known, the interactions between antibiotic resistance and wound microbiology and rationale for therapy are less clear. This study provides additional scientific data to help the development of a thoughtful evidence-based rationale for the treatment of wounds with common topical antimicrobials. n References 1. Sen CK, Gordillo GM, Roy S, Kirsner R, Lambert, L, Hunt TK, et al. Human skin wounds: a major and snowballing threat to public health and the economy. Wound Repair Regen. 2009;17(6): Singer AJ, Clark PA. Cutaneous wound healing. N Engl J Med. 1999; 341(10): Davies CE, Hill KE, Newcombe RG, Syephens P, Wilson MJ, Harding KG, et al. A prospective study of the microbiology of chronic venous leg ulcers to reevaluate the clinical predictive value of tissue biopsies and swabs. Wound Repair Regen. 2007;15(1): Harding KG, Morris HL, Patel GK. Science, medicine, and the future: healing chronic wounds. BMJ. 2002;324(7330): Brem H, Stojadinovic O, Diegelmann RF, Entero H, Lee B, Pastar I, et al. Molecular markers in patients with chronic wounds to guide surgical debridement. Mol Med. 2007;13(1-2): Harding KG, Morris HL, Patel GK. Science, medicine and the future: healing chronic wounds. Br Med J. 2002;324: Howell-Jones RS, Wilson MJ, Hill KE, Howard AJ, Price PE, Thomas DW. A review of the microbiology, antibiotic usage and resistance in chronic skin wounds. J Antimicrob Chemother. 2005;55(2): Eaglstein WH. Current wound management: a symposium. Clin Dermatol. 1984;2: McGuckin M, Goldman R, Bolton L, Salcido R. The clinical relevance of microbiology in acute and chronic wounds. Adv Skin Wound Care. 2003;16(1): Nishijima S, Kurokawa I, Nakaya H. Susceptibility change to antibiotics of Staphylococcus aureus strains isolated from skin infections between July November J Infect Chemother. 2002;8(2): Colsky AS, Kirsner RS, Kerdel FA. Analysis of antibiotic susceptibilities of skin wound flora in hospitalized dermatology patients. Arch Dermatol. 1998;134(8): Valencia IC, Kirsner RS, Kerdel FA. Microbiologic evaluation of skin wounds: alarming trend toward antibiotic resistance in an inpatient service during a 10-year period. J Am Acad Dermatol. 2004;50(6): Elward AM, McAndrews JM, Young VL. Methicillin-sensitive and methicillin-resistant Staphylococcus aureus: preventing surgical site infections following plastic surgery. Aesthetic Surg J. 2009;29(3): Jevons MP. Celbenin-resistant Staphylococci. Br Med J. 1961;1(5219): Rolinson GN. Letter to Editor. Br Med J. 1961;1: Parker MT, Jevons MP. A survey of methicillin-resistance in Staphylococcus aureus. Postgrad Med J. 1964;40(suppl): Davis SC, Ricotti C, Cazzaniga AL, Welch E, Eaglstein WH, Mertz PM. Microscopic and physiological evidence for biofilm-associated wound colonization in-vivo. Wound Repair Regen. 2008;16(1): Davis SC, Pisanni F, Montero RB. Effects of commonly used topical antimicrobial agents on Acinetobacter baumannii: an in-vitro study. Mil Med. 2008;173(1): Edwards R, Harding KG. Bacteria and wound healing. Curr Opin Infect Dis. 2004;17: Bowler PG. The 10 5 bacterial growth guideline: reassessing its clinical relevance in wound healing. Ostomy Wound Manage. 2003;49(1): Daltrey DC, Cunliffe WJ. A double-blind study of the effects of benzoyl peroide 20% and eusol and liquid paraffin on the microbial flora of leg ulcers. Acta Dermatologica Venereologica 1981;61(6): Trengove NJ, Stacey MC, McGechie DF, Stingemore NF, Mata S. Qualitative bacteriology and leg ulcer healing. J Wound Care. 1996;5: Gjodsbol K, Christensen JJ, Karlsmark T, Jorgensen B, Klein BM, Krogfelt KA. Multiple bacterial species reside in chronic wounds: a longitudinal study. Int Wound J. 2006;3: Pan ES, Diep BA, Carlten HA, Charlebois ED, Sensabaugh GF, Haller BL, Perdreau-Remington F. Increasing prevalence of methicillin-resistant Staphylococcus aureus infection in California jails. Clin Infect Dis. 2003;37: Panlilo AL, Culver DH, Gaynes RP, Banerjee S, Henderson TS, Martone WJ. Methicillin-resistant Staphylococcus aureus in US hospitals, Infect Control Hosp Epidemiol. 1991;13: Diep BA, Carlten HA, Chang RF, Sensabaugh GF, Perdreau-Remington F. Roles of 34 virulence genes in the evolution of hospital- and communityassociated strains of methicillin-resistant Staphylococcus aureus. J Infect Dis. 2006;193: Carlten HA, Diep BA, Charlebois ED, Sensabaugh GF, Perdreau-Remington F. Community-adapted methicillin-resistant Staphylococcus aureus (MRSA): population dynamics of an epanding community reservoir of MRSA. J Infect Dis. 2004;190: Kazakova SV, Hageman JC, Matava M, Srinivasan A, Phelan L, Garfinkle B, et al. A clone of methicillin- resistant Staphylococcus aureus among professional football players. N Engl J Med. 2005;352: Suzuki M, Yamada K, Nagao M, Aoki E, Matsumoto M, Hirayama T, et al. Antimicrobial ointments and methicillin-resistant Staphylococcus aureus USA300. Emerg Infect Dis. 2011;17(10): Pan ES, Diep BA, Charlebois ED, Auerswald C, Carlten HA, Sensabaugh GF, Perdreau-Remington F. Population dynamics of nasal strains of methicillin-resistant Staphylococcus aureus and their relation to communityassociated disease activity. J Infect Dis. 2005;192: Edris B, Reed JF. MRSA infection in lower etremity wounds. Int J Lower Etrem Wounds. 2008;7: Madsen SM, Westh H, Danielsen L, Rosdhal VT. Bacterial colonization and healing of venous leg ulcers. APMIS. 1996;104: Wright JB, Lam K, Burrell RE. Wound management in an era of increasing bacterial antibiotic resistance: a role for topical silver treatment. Am J Infect Control. 1998;26: Davis SC, Martinez L, Kirsner R. The diabetic foot: the importance of biofilms and wound bed preparation. Curr Diab Et Rep. 2006;6: Leaper DJ, Durani P. Topical antimicrobial therapy of chronic wounds healing by secondary intention using iodine products. Int Wound J. 2008;5: Daeschlein G. Antimicrobial and antiseptic strategies in wound management. Int Wound J. 2013;10(suppl 1): Mertz PM, Olivera-Gandia MF, Davis SC. The evaluation of a cadeomer iodine wound dressing on methicillin-resistant Staphylococcus aureus (MRSA) in acute wounds. Dermatol Surg. 1999;25: ostomy wound management april
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