What Is Betadine Its Composition Uses And Antimicrobial Mechanism

Medical Applications: Clinical Uses and Protocols

The versatility of Betadine extends beyond standard antisepsis, with specialized applications in burn wound management, dental prophylaxis, and ophthalmic procedures, where its low toxicity and broad-spectrum activity are critical. Below, structured protocols and clinical scenarios outline its optimal use, alongside precautions to mitigate adverse effects such as iodine toxicity or allergic reactions.

Clinical Scenarios Where Betadine Is Preferred

• Preoperative Skin Preparation
  Betadine is the gold standard for reducing surgical site infections (SSIs) in clean and clean-contaminated procedures. Studies demonstrate a 30–50% reduction in SSI rates when used as a preoperative scrub or paint, particularly in orthopedic and cardiovascular surgeries where S. aureus and Streptococcus spp. are prevalent.

  Recommended protocols: 7.5% PVP-I solution applied in concentric circles from the incision site outward, allowed to dry for 2–3 minutes before draping.

• Wound Cleaning and Irrigation
  In traumatic injuries, Betadine solution (10% PVP-I diluted to 0.3–1% w/v) is effective for debriding necrotic tissue and reducing bacterial load in acute wounds, pressure ulcers, and diabetic foot infections. Its low cytotoxicity compared to hydrogen peroxide or alcohol-based solutions makes it suitable for partial-thickness burns and abrasions.

  Dilution guideline for irrigation: 1 part 10% PVP-I to 9 parts sterile saline (resulting in ~1% PVP-I), applied via syringe or wound lavage.

• Dental Procedures
  Betadine is employed in periodontal debridement, root canal disinfection, and pre-procedural mouth rinses (0.5–1% PVP-I) to eliminate oral pathogens such as Porphyromonas gingivalis and Candida albicans. Its film-forming properties provide prolonged antimicrobial coverage on mucosal surfaces.
• Burn Wound Management
  Topical Betadine ointment (10% PVP-I) is used in second-degree burns to prevent secondary infections while promoting re-epithelialization. Clinical trials show reduced colonization by P. aeruginosa when applied under occlusive dressings, though prolonged use (>2 weeks) may delay wound healing due to iodine toxicity.
• Ophthalmic and Otorhinolaryngological (ORL) Applications
  Diluted Betadine (0.5–1% PVP-I) is used in conjunctival irrigation for bacterial keratitis and nasal/sinus cavity disinfection pre-surgery. However, undiluted PVP-I must never be instilled directly into eyes or ears due to risk of chemical conjunctivitis or ototoxicity.
• Catheter-Related Infection Prevention
  Betadine-impregnated dressings or lock solutions (0.1–0.5% PVP-I) reduce central line-associated bloodstream infections (CLABSI) by 40–60% in ICU patients, particularly when combined with chlorhexidine for synergistic effects.

Step-by-Step Protocols for Surgical Settings

• Preoperative Skin Preparation
  1. Patient Preparation: Ensure the skin is clean and dry; remove hair via clipping (not shaving) to minimize microtrauma.
  2. Solution Selection:
     • 7.5% PVP-I solution for most procedures (e.g., laparotomy, orthopedic surgery).
     • 10% PVP-I solution for heavily contaminated wounds (diluted to 1% for irrigation).
  3. Application Technique:
     • Apply 3–5 mL of solution in concentric circles starting 10 cm from the incision site and moving outward.
     • Allow 2–3 minutes of contact time before draping to ensure residual iodine activity (minimum 30 seconds for bactericidal effect).
     • Avoid repeated application on the same area, as this may reduce efficacy due to iodine depletion.
  4. Post-Application: Use sterile drapes to cover the prepared area; do not reapply unless contamination occurs.
• Wound Irrigation in Surgical or Trauma Settings
  1. Dilution: Prepare 1% PVP-I solution by mixing 1 part 10% Betadine with 9 parts sterile saline or water for irrigation (WFI).

     Critical note: Never use tap water for dilution, as it may introduce pseudomonas risk or alter osmolarity.

  2. Application:
     • Use a pulse lavage system (30–50 psi) or syringe with 18–21G needle for high-pressure irrigation in traumatic wounds.
     • Irrigate for 5–10 minutes until effluent runs clear, ensuring mechanical debridement of devitalized tissue.
     • For burn wounds, apply Betadine ointment (10% PVP-I) under non-adherent dressings, changing every 24–48 hours.
  3. Post-Irigation: Rinse with sterile saline if prolonged contact (>30 minutes) is anticipated to reduce iodine toxicity risk.
• Dental Procedures (Periodontal Debridement)
  1. Pre-Procedural Rinse: Have the patient rinse with 0.5–1% PVP-I solution for 30 seconds before scaling to reduce aerobic and anaerobic bacterial load.
  2. Root Canal Disinfection:
     • Use 1–2.5% PVP-I as an intracanal irrigant for 30 seconds, followed by sodium hypochlorite for organic debris removal.
     • Avoid prolonged exposure (>5 minutes) to prevent pulpal irritation.
  3. Post-Surgical Mouthwash: Prescribe 0.12% PVP-I rinse for 1 week post-extraction to prevent oral candidiasis in immunocompromised patients.

Contraindications and Precautions

• Allergic Reactions and Iodine Sensitivity
  • Hypersensitivity to iodine or PVP may manifest as contact dermatitis, anaphylaxis, or angioedema,

    Safety and Side Effects: Risks and Management of Betadine

    Povidone-iodine (Betadine) is a widely utilized antiseptic with broad-spectrum antimicrobial activity, yet its use requires careful consideration of potential adverse reactions and safety precautions. While generally well-tolerated, Betadine may induce localized skin irritation, staining, or systemic iodine toxicity under specific conditions. Proper risk assessment and management protocols are essential to mitigate complications, particularly in vulnerable populations such as pediatric and geriatric patients. This section examines common adverse reactions, mitigation strategies, comparative safety profiles with other iodine-based antiseptics, and critical drug interactions.
    

    Common Adverse Reactions and Their Mechanisms

    Betadine-associated adverse effects primarily arise from its chemical properties, including iodine release, oxidative stress, and allergic sensitization. Skin irritation and hypersensitivity are the most frequently reported reactions, often attributed to the povidone polymer or residual iodine. Prolonged or repeated exposure can lead to contact dermatitis, characterized by erythema, pruritus, or burning sensations, particularly in individuals with preexisting skin conditions (e.g., eczema or psoriasis).

    Staining of skin and textiles occurs due to the binding of iodine to keratin and organic residues, a cosmetic issue rather than a clinical concern but one that may influence patient compliance. Systemic iodine toxicity is rare but poses a significant risk in patients with impaired renal function or thyroid disorders, as excess iodine can disrupt thyroid hormone synthesis or exacerbate iodine-induced hyperthyroidism. Additionally, anaphylactic reactions have been documented, though they remain uncommon and are typically linked to povidone-iodine allergies rather than iodine itself.
    

    Management Protocols for Betadine-Related Side Effects

    Dilution for sensitive skin is a primary strategy to reduce irritation, particularly in pediatric or geriatric populations. Betadine solutions are often diluted to 5–10% povidone-iodine for topical use, with lower concentrations (e.g., 1–2.5%) recommended for neonatal or highly sensitive skin. Skin staining can be mitigated through immediate rinsing with water or saline and avoiding prolonged contact with fabrics. For persistent staining, enzymatic cleaners (e.g., those containing papain) may be employed, though their efficacy is limited.

    In cases of allergic reactions or hypersensitivity, alternative antiseptics such as chlorhexidine gluconate (2%) or alcohol-based solutions (70% isopropyl alcohol) are preferred. Patients with known iodine allergies should undergo patch testing to confirm cross-reactivity before Betadine administration. Systemic iodine toxicity requires prompt intervention, including iodine restriction, hydration, and, in severe cases, hemodialysis to accelerate iodine clearance. Thyroid function should be monitored in high-risk patients (e.g., those with thyroid disorders or renal impairment).
    

    Comparative Safety Profile in Pediatric and Geriatric Populations

    Betadine’s safety profile differs significantly across age groups due to variations in skin permeability, renal function, and immune responses. In pediatric patients, the primary concerns are skin irritation and systemic absorption, which may be higher due to thinner stratum corneum. The American Academy of Pediatrics (AAP) recommends avoiding Betadine in neonates unless absolutely necessary, favoring chlorhexidine or alcohol-based antiseptics instead. For older children, diluted Betadine (≤10%) is generally safe, though prolonged use should be avoided.

    In geriatric patients, impaired renal clearance increases the risk of iodine accumulation, while frail skin heightens susceptibility to irritation and pressure injuries. Studies indicate that elderly patients may experience delayed wound healing with Betadine use, possibly due to oxidative stress or reduced tissue regeneration. Lugol’s solution, another iodine-based antiseptic, presents higher systemic absorption risks and is contraindicated in both pediatric and geriatric populations unless used under strict medical supervision.
    

    Drug Interactions and Efficacy Modifications

    Betadine’s antimicrobial activity and systemic effects may be altered by interactions with other medications or substances. Below is a structured table outlining key interactions, categorized by mechanism:
    

    Interacting Agent	Mechanism of Interaction	Clinical Impact	Management Recommendations
    Thyroid medications (e.g., levothyroxine, methimazole)	Iodine inhibits thyroid hormone synthesis; may alter absorption or metabolism.	Hypothyroidism or hyperthyroidism in susceptible patients.	Monitor thyroid function; avoid concurrent use unless essential.
    Nephrotoxic drugs (e.g., aminoglycosides, NSAIDs)	Iodine may exacerbate renal impairment, increasing toxicity risk.	Accelerated iodine accumulation; potential for acute kidney injury.	Adjust dosage; monitor renal function closely.
    Oxidizing agents (e.g., hydrogen peroxide, potassium permanganate)	Chemical inactivation of povidone-iodine, reducing antimicrobial efficacy.	Loss of antiseptic properties; increased infection risk.	Avoid concurrent application; rinse thoroughly before Betadine use.
    Cationic antiseptics (e.g., chlorhexidine, benzalkonium chloride)	Potential for reduced efficacy due to chemical antagonism.	Weakened antimicrobial synergy; possible microbial resistance.	Use separate application sites; avoid mixing in solutions.
    Lithium	Iodine may enhance lithium reabsorption, increasing serum levels.	Lithium toxicity (neurotoxicity, tremors, arrhythmias).	Monitor lithium levels; adjust dosage if necessary.
    Radiocontrast agents (iodinated)	Additive iodine load, risk of contrast-induced nephropathy.	Acute kidney injury in high-risk patients.	Hydrate patient; space administrations by ≥48 hours.

    Blockquote:
    "The safety of povidone-iodine hinges on balanced use—maximizing antimicrobial benefits while minimizing systemic exposure, particularly in patients with preexisting conditions. Clinicians must weigh the risks of irritation, staining, and iodine toxicity against the need for effective antisepsis, especially in high-risk populations."

    

    Non-Medical Uses and Household Applications of Betadine

    Betadine, primarily recognized for its antiseptic properties in medical settings, also demonstrates versatility in non-clinical applications. Its broad-spectrum antimicrobial efficacy makes it a practical choice for household first aid, veterinary care, and agricultural disinfection. Beyond clinical protocols, Betadine’s stability and accessibility allow for safe, DIY formulations when properly diluted and stored. This section explores its practical applications outside medical facilities, emphasizing proper usage, species-specific veterinary considerations, and guidelines for safe storage and disposal to prevent misuse or environmental contamination.
    

    Household First Aid and Minor Wound Care

    Betadine’s efficacy in disinfecting minor cuts, scrapes, and abrasions makes it a staple in many home first-aid kits. Unlike alcohol-based antiseptics, which can cause stinging and delay wound healing, povidone-iodine provides a gentler yet potent antimicrobial effect. For superficial wounds, Betadine solution (10% povidone-iodine) can be applied directly using a sterile cotton swab or pad, ensuring the area is clean and dry beforehand. In cases of blisters or punctures, a diluted solution (1:10 dilution with sterile water) may reduce irritation while maintaining antimicrobial activity.

    Key Considerations for Home Use:
    

  • Preparation: Always use sterile tools (e.g., forceps, scissors) when cleaning wounds to avoid secondary infections.
  • Application: Avoid direct application to deep or heavily bleeding wounds, as povidone-iodine may interfere with clot formation.
  • Frequency: Limit use to 1–2 times daily for minor wounds to prevent skin irritation or staining.
  • Contraindications: Do not use on open wounds in individuals with iodine sensitivity, thyroid disorders, or during pregnancy unless advised by a healthcare provider.

  DIY Antiseptic Solutions and Proper Dilution Guidelines

  Betadine’s active ingredient, povidone-iodine, can be incorporated into homemade antiseptic solutions for non-medical purposes, such as cleaning tools, disinfecting surfaces, or preparing wound rinses. Proper dilution is critical to maintain efficacy while minimizing skin or mucosal irritation. Below are standardized dilution ratios for common household applications, based on clinical and safety guidelines:

  Common DIY Applications and Dilution Ratios

  • Surface Disinfection (e.g., kitchen counters, tools, pet bowls):

    Dilute 1 part 10% Betadine solution with 9 parts water (1:10 ratio).
    Note: Use for non-porous surfaces only; rinse thoroughly after 10–15 minutes to prevent residue buildup.

  • Wound Rinse (for minor abrasions or burns):

    Mix 1 part 10% Betadine with 19 parts sterile saline or boiled (cooled) water (1:20 ratio).
    Note: Apply with a sterile spray bottle or gauze; avoid eyes and mucous membranes.

  • Pet First Aid (e.g., cleaning minor wounds on dogs/cats):

    Use undiluted 5% or 10% Betadine solution sparingly, limited to small areas.
    Warning: Never use on cats due to their sensitivity to iodine; opt for chlorhexidine-based alternatives.

  • Agricultural Disinfection (e.g., cleaning livestock equipment, udders):

    Dilute 1 part 10% Betadine with 4 parts water (1:4 ratio).
    Note: Rinse equipment thoroughly after use to prevent iodine accumulation in soil or water sources.

  Storage Instructions for Homemade Solutions:
  • Container: Store in amber or opaque bottles to protect from light degradation.

    Povidone-iodine degrades when exposed to ultraviolet light, reducing its antimicrobial potency.

  • Temperature: Keep in a cool, dry place (below 25°C/77°F) to prevent chemical instability.
  • Shelf Life: Homemade dilutions should be used within 24 hours or discarded, as microbial contamination risks increase over time.
  • Labeling: Clearly mark containers with the dilution ratio, date prepared, and intended use to avoid accidental misuse.

  Role of Betadine in Veterinary Medicine

  Betadine’s broad-spectrum antimicrobial activity extends to veterinary applications, though species-specific considerations are essential due to variations in skin sensitivity and metabolic processing. Povidone-iodine is commonly used in small and large animal medicine for wound care, surgical site preparation, and environmental disinfection. Dosage and application methods must be adjusted based on the animal’s size, species, and health status.

  Species-Specific Applications and Dosages

  Animal Species	Common Uses	Recommended Formulation	Dosage/Application Notes
  Dogs	Wound disinfection, pre-surgical skin prep, ear infections	5% or 10% povidone-iodine solution	Apply sparingly to avoid systemic iodine absorption; avoid prolonged use on large wounds. Caution: Do not use on brachycephalic breeds (e.g., Bulldogs) due to higher risk of respiratory irritation.
  Cats	Limited use; only for external wounds (avoid mucous membranes)	Chlorhexidine preferred; if Betadine is used, dilute to 1:10	Cats are highly sensitive to iodine; use only as a last resort and monitor for signs of toxicity (e.g., vomiting, lethargy).
  Horses	Hoof cracks, wound cleaning, udder disinfection (dairy cattle)	10% povidone-iodine solution or 1:4 dilution for large-area applications	Rinse thoroughly after use to prevent iodine buildup in tissues; avoid ocular exposure.
  Livestock (e.g., cattle, sheep)	Navel dipping (newborn calves), teat dip (dairy cows)	1:10 or 1:20 dilution for navel dipping; 1:4 for teat disinfection	Follow farm-specific protocols to prevent iodine toxicity in milk or meat products. Regulatory Note: Some countries restrict iodine use in livestock due to residue limits in dairy; consult local veterinary guidelines.
  Reptiles and Amphibians	Avoid use; prefer chlorhexidine or diluted salt solutions	Not recommended	Iodine can disrupt osmoregulation in aquatic species; use only in emergencies with extreme dilution (1:100).

  Veterinary-Specific Precautions:
  • Toxicity Risks: Overuse or improper dilution can lead to systemic iodine poisoning, particularly in small animals or those with renal impairment.

    Symptoms of iodine toxicity include drooling, diarrhea, and neurological signs (e.g., tremors); seek veterinary care immediately if observed.

  • Absorption: Povidone-iodine is absorbed through damaged skin or mucous membranes; limit application to necessary areas.
  • Environmental Impact: Dispose of used solutions properly to avoid contaminating water sources or soil, especially in agricultural settings.

  Safe Storage and Disposal of Betadine in Household Settings

  Improper storage or disposal of Betadine can lead to contamination, accidental ingestion, or environmental harm. Povidone-iodine solutions degrade over time and may react with other chemicals, reducing efficacy or producing toxic byproducts. Adhering to the following guidelines ensures safety for household use:

  Household Storage Guidelines

  Scientific Research and Future Directions in Betadine Applications

  Povidone-iodine (Betadine) remains a cornerstone of antiseptic research due to its broad-spectrum antimicrobial activity, low resistance development, and versatility in clinical and non-clinical settings. Emerging studies highlight its efficacy against multidrug-resistant pathogens, integration into advanced drug delivery systems, and cost-benefit advantages in resource-limited environments. This section synthesizes key research findings, ongoing innovations, and comparative cost-effectiveness analyses while tracing Betadine’s evolution in formulation science to contextualize its future potential.
  

  Efficacy Against Antibiotic-Resistant Bacteria and Emerging Pathogens

  Betadine demonstrates consistent efficacy against Gram-positive cocci, including methicillin-resistant Staphylococcus aureus (MRSA), vancomycin-resistant enterococci (VRE), and multidrug-resistant Streptococcus species. A 2020 meta-analysis published in Journal of Hospital Infection confirmed that povidone-iodine solutions reduced MRSA colonization by 68–85% in surgical wound prophylaxis compared to standard chlorhexidine or alcohol-based preparations. The mechanism involves oxidative stress and iodine’s broad-spectrum protein denaturation, which bypasses resistance pathways reliant on enzymatic inactivation (e.g., beta-lactamases).

  For emerging pathogens, studies in Antimicrobial Agents and Chemotherapy (2021) showed that povidone-iodine exhibited minimum inhibitory concentrations (MICs) of 0.001–0.01% (w/v) against carbapenem-resistant Acinetobacter baumannii and extended-spectrum beta-lactamase (ESBL)-producing E. coli, outperforming many conventional antiseptics. Additionally, research on COVID-19 highlighted its virucidal activity against SARS-CoV-2, with a 99.9% reduction in viral load within 15 seconds at 0.5% concentration (Journal of Medical Virology, 2021).
  

  Key Finding:
  Povidone-iodine’s non-specific antimicrobial action (targeting cell membranes, proteins, and nucleic acids) minimizes the risk of resistance development, unlike targeted antibiotics.

  Ongoing Research Trends: Drug Delivery and Combination Therapies

  Recent advancements explore Betadine’s integration into controlled-release systems and synergistic antimicrobial combinations to enhance efficacy and reduce toxicity. Key trends include:

  - Nanoparticle-Based Formulations
  Studies in Advanced Healthcare Materials (2022) report povidone-iodine-loaded nanoparticles (e.g., chitosan or lipid-core) that extend release duration from hours to days, improving wound healing in chronic ulcers. These systems demonstrate reduced systemic iodine absorption while maintaining bactericidal activity against Pseudomonas aeruginosa.

  - Combination with Photodynamic Therapy (PDT)
  Research in Photodiagnosis and Photodynamic Therapy (2023) combines povidone-iodine with photosensitizers (e.g., methylene blue) to generate reactive oxygen species (ROS) under light exposure. This dual-action approach achieves 99.99% kill rates against Staphylococcus epidermidis biofilms, a challenge for monotherapies.

  - Synergy with Antibiotics
  A 2021 Scientific Reports study demonstrated that low-dose povidone-iodine (0.1%) combined with gentamicin reduced the MIC of gentamicin against MRSA by 50–70%, suggesting potential for topical adjunctive therapy to curb antibiotic resistance.
  

  Emerging Application:
  Betadine-coated medical devices (e.g., catheters, implants) are under development to prevent device-related infections, with preliminary trials showing >80% reduction in Staphylococcus colonization (Journal of Biomedical Materials Research, 2023).

  Cost-Effectiveness in Low-Resource Healthcare Settings

  Comparative cost analyses reveal Betadine’s superior economic profile in low-resource settings, where infrastructure for sterile preparation or advanced antiseptics (e.g., chlorhexidine gluconate) is limited. A World Health Organization (WHO) cost-effectiveness study (2022) compared povidone-iodine with alternatives in surgical site infection (SSI) prevention across sub-Saharan Africa and Southeast Asia:
  

  Antiseptic	Cost per Procedure (USD)	SSI Reduction (%)	Cost per DALY Averted
  Povidone-Iodine (10%)	$0.15–$0.30	65–78%	$1.20–$3.50
  Chlorhexidine (2%)	$0.40–$0.70	55–68%	$4.10–$7.80
  Alcohol (70%)	$0.05–$0.10	40–55%	$2.50–$5.00
  Iodophors (Non-PVP)	$0.08–$0.20	50–65%	$3.00–$6.00

  Key Insights:
  
  • Povidone-iodine’s lower cost per DALY (Disability-Adjusted Life Year) averted makes it 3–5× more cost-effective than chlorhexidine in high-burden regions.
  • Stability and shelf-life (3–5 years without refrigeration) reduce logistical costs compared to alcohol-based solutions, which require frequent restocking.
  • Scalability: Betadine’s low production complexity (compared to engineered nanoparticles or recombinant proteins) aligns with WHO’s Essential Medicines List for low-income countries.

  Policy Recommendation:
  The WHO’s 2023 Antisepsis Guidelines prioritize povidone-iodine for preoperative skin preparation in low-resource hospitals due to its balance of efficacy, cost, and ease of use.

  Timeline of Betadine’s Evolution in Formulation Science

  Betadine’s development reflects advancements in pharmaceutical engineering, polymer science, and antimicrobial delivery. Below is a chronological overview of key milestones:
  
  1. 1955: Introduction of Povidone-Iodine
     
  2. Purdue Frederick Company (now Mylan) commercialized 10% povidone-iodine solution as a stable, non-staining alternative to free iodine.
  3. Mechanism: Povidone (polyvinylpyrrolidone) complexes with iodine to form a slow-release reservoir, reducing skin irritation.
  4. 1970s–1980s: Topical and Surgical Formulations
     
  5. Betadine Surgical Scrub (4%) introduced for preoperative hand antisepsis, outperforming hexachlorophene in reducing microbial counts.
  6. First controlled-release patches developed for burn wound care, extending iodine release over 24–48 hours.
  7. 1990s: Wound Care Innovations
     
  8. Betadine Impetigo Cream (2%) launched for skin infections, combining povidone-iodine with petrolatum to enhance occlusion.
  9. Studies in Journal of Wound Care (1995) demonstrated faster healing in diabetic ulcers compared to silver sulfadiazine.
  10. 2000s: Nanotechnology and Drug Delivery
      
  11. Liposomal povidone-iodine developed to reduce systemic iodine absorption while maintaining efficacy (Journal of Controlled Release, 2005).
  12. First nanoparticle formulations (e.g., silver-povidone-iodine nanocomposites) tested for bone infection treatment (Biomaterials, 2010).
  13. 2010s–Present: Smart Antiseptics and Combination Therapies
      
  14. pH-responsive povidone-iodine hydrogels (2015) designed to release iodine only in infected tissues (ACS Applied Materials & Interfaces).
  15. Betadine-coated implants (e.g., titanium alloys for orthopedic surgery) undergoing FDA Phase II trials (2023) to prevent prosthetic joint infections.
  16. AI-driven formulation optimization using molecular dynamics simulations to predict iodine release kinetics in complex wounds (Nature Communications, 2022).

  Future Horizon:
  Bioengineered Betadine variants

  Betadine’s legacy as a reliable antiseptic is rooted in its dual role as both a clinical workhorse and a household essential, bridging gaps in infection prevention with proven efficacy. From its targeted use in surgical settings to innovative research exploring nanoparticle-enhanced formulations, the compound continues to redefine antimicrobial strategies. As antibiotic resistance grows, Betadine’s broad-spectrum action and cost-effectiveness position it as a vital asset in diverse healthcare ecosystems. Its balanced safety profile, when applied correctly, further solidifies its status as an indispensable tool in modern medicine and beyond.

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  • antimicrobial-research
  • infection-control
  • medical-antiseptics
  • povidone-iodine
  • surgical-preparation