A clinical perspective of chitosan nanoparticles for infectious disease management.

Infectious diseases and their effective management are still a challenge in this modern era of medicine. Diseases, such as the SARS-CoV-2, Ebola virus, and Zika virus, still put human civilization at peril. Existing drug banks, which include antivirals, antibacterial, and small-molecule drugs, are the most advocated method for treatment, although effective but they still flounder in many instances. This calls for finding more effective alternatives for tackling the menace of infectious diseases. Nanoformulations are progressively being implemented for clinical translation and are being considered a new paradigm against infectious diseases. Natural polymers like chitosan are preferred to design nanoparticles owing to their biocompatibility, biodegradation, and long shelf-life. The chitosan nanoparticles (CNPs) being highly adaptive delivers contemporary prevention for infectious diseases. Currently, they are being used as antibacterial, drug, and vaccine delivery vehicles, and wound-dressing materials, for infectious disease treatment. Although the recruitment of CNPs in clinical trials associated with infectious diseases is minimal, this may increase shortly due to the sudden emergence of unknown pathogens like SARS-CoV-2, thus turning them into a panacea for the management of microorganisms. This review particularly focuses on the all-around application of CNPs along with their recent clinical applications in infectious disease management.

Silk Fibroin/PVA/ZnO nanocomposites wound dressings

Impaired wound recovery can fail to local hypoxia or tissue necrosis and ultimately result in abnormality or even death. Several factors can influence the wound healing environment, including bacterial or fungal infections, different disease states, desiccation, edema, and even systemic viral infections such as COVID-19. Silk fibroin, the fibrous structural-protein component in silk, has emerged as a promising treatment for these impaired processes by promoting functional tissue regeneration. Silk fibroin's dynamic properties allow for customizable nanoarchitectures, which can be tailored for effectively treating various wound healing impairments. Wound dressing materials designed from biocompatible and biodegradable polymersare widely used in wound healing. The present investigation deals withthe preparation of a unique blend of Silk Fibroin (SF)-Polyvinyl Alcohol (PVA) and ZnO nanoparticles (NPs) composite film (SF-PVAZnO NPs). The comparison of blend of SF- PVA and SF-PVA-ZnO Ps composite films were studied. The physical-chemicalcharacterizations of synthesized ZnO NPs and prepared composite films (SF-PVA and SF-PVA-ZnO) were studied. The field emission scanning electron microscopy confirmed the ZnO NPs embedded into SF-PVA composite film. The SF-PVA-ZnO NPs composite film showed enhanced mechanical property due to ZnO NPs. Antibacterial activity of the prepared composite filmsreveals that embedded ZnO NPs shows excellent antibacterial activity against wound infection-causing microorganisms. SF-PVA-ZnO composite film showed enhanced swelling behavior and faster blood clotting ability compared to control SF-PVA composite film. In-vitro cytocompatibility study exhibits the nontoxic nature of the synthesized SF-PVA-ZnO composite film. These studies confirm the designed composite film holds a huge potential to be used in dressing material for infected wound. © 2023 Nova Science Publishers, Inc.

Anesthetic management of toxic epidermal necrolysis: a report of two cases

Toxic epidermal necrolysis (TEN), is an acute, life-threatening emergent disease involving the skin and mucous membranes with serious systemic complications. It is characterized by widespread epidermal sloughing. Drugs are the most common triggers of TEN, but infection, vaccination, radiation therapy and malignant neoplasms can all induce it in susceptible patients. We report two cases in whom a hair dye and a COVID-19 vaccine (BioNTech, Pfizer) were believed to be the causative agents. These patients have to undergo repeated debridements of the necrotic tissue. In this manuscript the anesthetic management of TEN patients is discussed. Detailed preoperative evaluation, aggressive fluid and electrolyte replacement, avoidance of hypothermia during debridement, minimizing anesthetic agents and limiting traumatic procedures are key points in the management.Copyright © 2023 Faculty of Anaesthesia, Pain and Intensive Care, AFMS. All rights reserved.

Aptamers as Novel Binding Molecules on an Antimicrobial Peptide-Armored Composite Hydrogel Wound Dressing for Specific Removal and Efficient Eradication of Pseudomonas aeruginosa.

Here we present for the first time a potential wound dressing material implementing aptamers as binding entities to remove pathogenic cells from newly contaminated surfaces of wound matrix-mimicking collagen gels. The model pathogen in this study was the Gram-negative opportunistic bacterium Pseudomonas aeruginosa, which represents a considerable health threat in hospital environments as a cause of severe infections of burn or post-surgery wounds. A two-layered hydrogel composite material was constructed based on an established eight-membered focused anti-P. aeruginosa polyclonal aptamer library, which was chemically crosslinked to the material surface to form a trapping zone for efficient binding of the pathogen. A drug-loaded zone of the composite released the C14R antimicrobial peptide to deliver it directly to the bound pathogenic cells. We demonstrate that this material combining aptamer-mediated affinity and peptide-dependent pathogen eradication can quantitatively remove bacterial cells from the "wound" surface, and we show that the surface-trapped bacteria are completely killed. The drug delivery function of the composite thus represents an extra safeguarding property and thus probably one of the most important additional advances of a next-generation or smart wound dressing ensuring the complete removal and/or eradication of the pathogen of a freshly infected wound.

Evaluation of a five-layer hydrocellular polyurethane foam dressing across wound care settings in southern Europe.

OBJECTIVE: The burden of chronic wounds did not disappear during the Covid-19 pandemic, so new ways to address healthcare practitioner (HCP) education had to evolve. The Teach, Try, and Talk (T3) programme was conceived in 2021 with HCPs in southern Europe (Italy, Spain and Portugal). METHOD: Virtual education sessions with experienced HCP guest speakers were held and a five-layer hydrocellular polyurethane foam dressing (HPFD) was introduced as a way of reducing dressing change frequencies and improving clinician satisfaction. HCPs recorded their experience of the HPFD using an online form and participated in a further virtual session with experienced HCPs to discuss the results. RESULTS: There were a total of 190 responses. A significant dressing change reduction from 3.6 changes per week to 1.8 with the HPFD (p<0.001) was observed in Italy, Spain and Portugal and within different care settings (hospital, wound clinic/health centre and the patient's home). Nearly one-third of participants stated one more day of dressing wear time was achieved by the ability of the HPFD to lock in and manage exudate, with nearly a quarter of responses stating it was due to fewer than three dressing lobes being full. The majority (97.8%) of HCPs stated they would recommend the HPFD to colleagues and patients. CONCLUSION: The T3 programme is a highly successful method of training delivery and practice improvement across a variety of healthcare settings in southern Europe, helping support HCP engagement and ongoing development in challenging times during the Covid-19 pandemic. The programme can be adapted considering the needs of different HCPs and payor and/or healthcare systems.

Beneficial Effect of Wound Dressings Containing Silver and Silver Nanoparticles in Wound Healing-From Experimental Studies to Clinical Practice.

Impaired wound healing affects hundreds of million people around the world; therefore, chronic wounds are a major problem not only for the patient, but also for already overloaded healthcare systems. Chronic wounds are always very susceptible to infections. Billions of dollars are spent to discover new antibiotics as quickly as possible; however, bacterial resistance against antibiotics is rising even faster. For this reason, a complete shift of the antibacterial treatment paradigm is necessary. The development of technology has allowed us to rediscover well-known agents presenting antimicrobial properties with a better outcome. In this context, silver nanoparticles are a promising candidate for use in such therapy. Silver has many useful properties that can be used in the treatment of chronic wounds, such as anti-bacterial, anti-inflammatory, and anti-oxidative properties. In the form of nanoparticles, silver agents can work even more effectively and can be more easily incorporated into various dressings. Silver-based dressings are already commercially available; however, innovative combinations are still being discovered and very promising results have been described. In this review article, the authors focused on describing experimental and clinical studies exploring dressings containing either silver or silver nanoparticles, the results of which have been published in recent years.

Skin lesions resulting from use of personal protective equipment in the context of COVID-19: a cross-sectional study.

OBJECTIVE: During the SARS-CoV-2 (COVID-19) pandemic, to prevent the transmission of the virus, the use of personal protection products and equipment were recommended by international and national organisations. The need to use it more frequently and for a long time can damage the skin of health professionals. The aim of this study was to estimate the prevalence and factors associated with skin lesions in health professionals resulting from the use of personal protective equipment (PPE). METHOD: This was a cross-sectional exploratory study through an online questionnaire. The first part of the questionnaire collected socio-labour characterisation data and the second part related to exposure factors. The variables were analysed according to the prevalence and the odds ratio (OR), within a 95% confidence interval (CI). RESULTS: Of the 398 participants who met the inclusion criteria, 65.3% were self-diagnosed with skin lesions: 37.3% with pressure injury, 25.8% with contact/allergic dermatitis and 2.7% with acne. Regarding the use of PPE, of the 240 professionals who reported using an N95 mask, 80.4% developed injuries, 70.4% of which related to a work regime of >6 hours per day (OR: 2.08, 95% CI: 1.79-2.42). CONCLUSION: The results of this study showed a significant prevalence of skin lesions in health professionals. Among exposure factors, the N95 mask and goggles stand out. Longer or more frequent exposure time to personal protective products and equipment proved to be important factors to be considered.

Use of acellular intact fish skin grafts in treating acute paediatric wounds during the COVID-19 pandemic: a case series.

OBJECTIVE: More specific strategies are needed to support children requiring skin grafting. Our goal was to identify procedures that reduce operating times, post-operative complications, pain and length of hospital stay. Patient safety, optimal wound bed support and quick micro-debridement with locoregional anaesthesia were prioritised. Ultimately, a novel acellular fish skin graft (FSG) derived from north Atlantic cod was selected for use. METHOD: We admitted consecutive paediatric patients with various lesions requiring skin grafting for definitive wound closure. All FSGs were applied and bolstered in the operating room following debridement. RESULTS: In a cohort of 15 patients, the average age was 8 years and 9 months (4 years 1 month-13 years 5 months). Negative pressure wound therapy (NPWT) was given to 12 patients. Rapid wound healing was observed in all patients, with a wound area coverage of 100% and complete healing in 95% of wounds. Time until engraftment in patients receiving NPWT was reduced by about a half (to an average 12 days) from our standard experience of 21 days. Ten patients received locoregional anaesthesia and were discharged after day surgery. The operating time was <60 minutes, and no complications or allergic reactions were reported. Excellent pliability of the healed wound was achieved in all patients, without signs of itching and scratching in the postoperative period. This case series is the first and largest using FSG to treat paediatric patients with different wound aetiologies. We attribute the rapid transition to acute wound status and the good pliability of the new epidermal-dermal complex to the preserved molecular components of the FSG, including omega-3. CONCLUSION: FSG represents an innovative and sustainable solution for paediatric wound care that results in shorter surgery time and reduced hospital stays, with accelerated wound healing times.

Recent Advances in Silver Nanoparticles Containing Nanofibers for Chronic Wound Management.

Infections are the primary cause of death from burns and diabetic wounds. The clinical difficulty of treating wound infections with conventional antibiotics has progressively increased and reached a critical level, necessitating a paradigm change for enhanced chronic wound care. The most prevalent bacterium linked with these infections is Staphylococcus aureus, and the advent of community-associated methicillin-resistant Staphylococcus aureus has posed a substantial therapeutic challenge. Most existing wound dressings are ineffective and suffer from constraints such as insufficient antibacterial activity, toxicity, failure to supply enough moisture to the wound, and poor mechanical performance. Using ineffective wound dressings might prolong the healing process of a wound. To meet this requirement, nanoscale scaffolds with their desirable qualities, which include the potential to distribute bioactive agents, a large surface area, enhanced mechanical capabilities, the ability to imitate the extracellular matrix (ECM), and high porosity, have attracted considerable interest. The incorporation of nanoparticles into nanofiber scaffolds constitutes a novel approach to "nanoparticle dressing" that has acquired significant popularity for wound healing. Due to their remarkable antibacterial capabilities, silver nanoparticles are attractive materials for wound healing. This review focuses on the therapeutic applications of nanofiber wound dressings containing Ag-NPs and their potential to revolutionize wound healing.

Health Education In The Self Care Process Of The Chronic Wounds Healing Of The Diabetic Foot

Purpose/Objectives: The increase in life expectancy in recent years is closely related to scientific advances in health area. Thus, longevity led to a greater emergence of chronic diseases, such as diabetes mellitus (DM). In this scenario, chronic wounds represent a serious public health problem. It is estimated that 85% of lower extremity amputations in individuals with DM are related to the presence of foot ulcers. The perception of changes in the skin, such as deformities, superficial traumas and cracks, is impaired in diabetics due to loss of sensitivity, predisposing the appearance of wounds. Ulcers and other injuries can be prevented through simple measures, such as regular skin inspection, specialized care and the use of adequate footwear;as the greater understanding of self-care, the greater the benefits of treatment. In this sense, Primary Care is an effective mean of assisting such individuals, as health education actions can be carried out for this population, their families and caregivers, with a view of promoting health. In addition, the health education process must take place in parallel with medication and dressings, which are essential, especially the latter, given the specificity of the product and the level of tissue regeneration. The primary objective of this study is to present the educational activities developed by the Extension Project Physiotherapy in the Community of the State University of Paraíba in partnership with the research project Tissue Engineering in Epithelial Repair: Biodegradable Scaffold for Tissue Regeneration, which is developing chitosan/Jatropha mollissima scaffolds, in the Laboratory of Evaluation and Development of Biomaterials from the Northeast of the Federal University of Campina Grande. Methodology: The participants consisted of users of Basic Health Units (BHU) in the city of Campina Grande/Paraiba/Brazil. The educational material on Diabetes and Diabetic Foot Wound Care was produced from documents such as articles, guidelines and booklets. The CANVA application was used to create the images and infographics, to facilitate the understanding of the participants, and it was sent along with an explanatory audio. The disclosure took place on the public profile on Instagram @fisionacomunidadeuepb and also through the WhatsApp application for the diabetic elderly who participate in the project, in addition to face-to-face meetings at BHU, to clarify doubts at previously scheduled times and with a limited number of people due to the covid 19 pandemic. Results: The results included a greater understanding of the process of illness and wound development, as well as awareness of the importance of adherence to treatment and care in the use of dressings, especially. According to the records, the participation in the means used was intense, which suggests that these people will also be multipliers in the health education process. Conclusion/Significance: It is concluded that health education strategies, even at the time of a pandemic, are useful in the process of correct information dissemination, helping the most vulnerable population to understand their disease and, at the same time, help them in self care and responsibility, thus facilitating the intervention used by the health and engineering team.

Polyurethane With Instant And Persistent Antimicrobial Efficacy Against Bacteria And SARSCoV- 2

Purpose/Objectives: Gram-negative bacteria including E. coli and P. aeruginosa can survive for months on dry hard surfaces, and SARS viruses can persist for days. These contaminated surfaces along with patients' damaged skin barriers, due to wounds or central line insertion sites, increase the risk healthcare-acquired infections (HAI) and subsequent serious complications. Furthermore, with increased frequency and duration of hospitalizations due to the current pandemic, the number of HAIs is on the rise. Currently there are no antimicrobial surfaces that provide both instant and long-lasting antimicrobial protection against a broad spectrum of infectious microbes. Liquid- or radiation-based disinfection techniques are kill microbes quickly, but their effect does not last long before needing reapplication. Antimicrobial surfaces based on heavy metals remain antimicrobial for long durations, but complete disinfection can take hours. In this work, we developed a new class of plant-inspired antimicrobial surfaces and wound dressings that incorporate plant secondary metabolites capable of rapid disinfection (> 4-log reduction) of common bacteria and viruses and maintain their efficacy over time (> 6 months). Methodology: We developed a method for stabilizing naturally antimicrobial essential oils components from plants such as, alpha terpineol (AT) and cinnamaldehyde (CMA), within a polyurethane polymer. Using a modified standard method for evaluating the performance of different nonporous solids (ISO 22196) and median tissue culture infection dose assay, these antimicrobial polyurethane coatings were tested and found to be effective in killing E. coli, P. aeruginosa, methicillin-resistant S. aureus (MRSA), and SARS-CoV-2. The durability of the coatings was tested by linear abrasion, UV and airflow exposure. Application methods such as spray coating and dip coating allow the coating to be applied to a variety of surfaces. Results: Polyurethane surfaces containing 35% AT content (PU-35%AT) showed a ∼5.8-log reduction in E. coli colony forming units per cm2 (CFU/cm2) in under 2 minutes, a shorter time than common commercial disinfectants. Additionally, when subjected to 8 consecutive rounds of inoculation the PU- 35%AT surface reduced the E. coli by >99.99% for all 8 rounds. We achieved a ∼5.8-log reduction of MRSA within 5 minutes on PU-60%AT. The PU-35%AT surfaces showed a 4.0-log reduction in SARS-CoV- 2 in 60 minutes. A PU-70%AT showed a 1.6-log reduction after 10 minutes and maintained virucidal capabilities after 2 weeks. PU+35%AT surfaces maintained a ∼5.3-log reduction in CFU/cm2 in MRSA and E. coli after 1000 abrasion cycles, 12 hours of UV exposure, 25 hours of exposure to -17°C, or 5 months of air flow. Lastly, to demonstrate the coating's real world functionality the PU+35%AT coating was successfully applied to a computer keyboard, cell phone screen protector and medical gauze. Conclusion/Significance: This work demonstrates a novel approach for fabricating a broad-spectrum antibacterial and antiviral polymer surface based on plant essential oil components. This antimicrobial polyurethane coating has not only rapid bactericidal and virucidal capabilities but maintains this efficacy over time. Additionally, the coating can be applied to a variety of surfaces including medical gauze to create wound dressings that significantly reduce bacterial burden and decrease chances of HAIs.

TELEMEDICINE IN POST-CIED CARE

Background: Previously, all patients post-CIED implant returned to the clinic to have wound assessment, reinforce device knowledge, and confirm remote connectivity. This did not offer any tailored options for patient follow-up. Narrative: At the onset of COVID-19, wound checks post-CIED implants were changed from in person visits to telemedicine. For the few patients who had wound healing/hematoma issues identified, the patient was asked to come to clinic for further assessment. The objective of the telemedicine visit was to assess incision healing post-CIED implant. The visit also allowed the provider to ensure remote connectivity and review expectations for establishing routine device follow up. Many patients preferred the convenience of the telemedicine as it reduced travel cost and hassle of getting to the clinic, making it a more time efficient visit. For those who scheduled for a telemedicine visit, expectations of the video visit is set at the time of discharge. We need to ask the patient if they are willing to take off the Steri-Strips at time of the telemedicine visit and send them home with the needed supplies for the telemedicine visit. If patient declined removing the Steri-Strips, they were instructed to let the bandage gradually come off. They were then instructed to notify clinic for any concerning signs/symptoms. Challenges with the video quality, at times, necessitated higher quality photos to be taken and sent in for better assessment of incision site. We identified specific patients, ie, patients taking anticoagulation medication or those who had a higher risk of infection, benefitted from an in clinic visit to allow a more accurate assessment of the pocket and incision line. Therefore, those patients were required to return to clinic. Conclusion: What started out as a pandemic necessity, expanded the opportunities for telemedicine assessments to evaluate wound healing and to provide education through a telemedicine format.

Abdominal Wall Fungal Co-infection-Mucormycosis Associated with COVID-19: A Case Report

Aim and objective: To present a rare case of abdominal wall fungal coinfection with Mucormycosis in a patient of COVID-19. Materials and methods: A 33-year-old female operated case of laparoscopic ectopic pregnancy removal with salpingectomy and tubectomy, at postoperative day 5 had redness and pus discharge from the operative site and was diagnosed with abdominal wall cellulitis. She underwent local exploration and wound wash. On postoperative day 21, the patient came to the emergency room with cellulitis, and pain at the port insertion site. On examination, we highlight BP 90/50 mm Hg and blood test analysis with HB-8.3, leucocyte count 29.91 × 109/L, CRP 333 mg/L. Results: CT scan revealed necrotizing fasciitis. She underwent wide local excision and debridement. Post debridement the next day during dressing, the wound showed a cotton fluffy appearance at the edges and part of the base with black necrotic areas. A wound swab was sent for fungal culture, KOH mount, pus culture, and tissue for histopathology. In the meantime, she was started on empirical antifungal amphotericin B, meropenem, and minocycline antibiotics. On history, the patient remarked that she did have fever, sore throat, and cough for 5 days, 4 weeks before laparoscopic ectopic pregnancy removal. Also one of her family members had tested positive for COVID-19. COVID antibodies test was done which were reactive: 1.96. Tissue histopathology revealed mucormycosis. MRI abdomen findings showed a 15 cm large defect involving the entire thickness of subcutaneous fat. A high degree of suspicion and promptness in starting antifungal treatment prevented the fatal outcome. Conclusion: COVID-19 is associated with immune dysregulation and consequently life-threatening infections. The prolonged and indiscriminate use of steroids for the treatment of COVID-19 could contribute to this problem of fungal superinfection of mucormycosis. It seems prudent to have a very high suspicion supplemented with thorough clinical examination and low threshold for imaging in order to diagnose secondary fungal infections, such as mucormycosis. Early so that the treatment can be instituted as soon as possible.

Distinct Antimicrobial Analysis to Evaluate Multi-Component Wound Dressing Performance

Wound infection hinders adequate healing, being particularly grievous and prevalent in burn wounds and chronic wounds. Wound infection extends inflammation, preventing epithelialization and angiogenesis. Therefore, infection prolongs healing time, steeply increases treatment costs and degrades patients wellbeing. One successful strategy to control wound infection is to apply an active wound dressing, able to eliminate or significantly reduce the microbial population present at the infection site. Silver nanoparticles (AgNPs) are a multipurpose antimicrobial agent with a wide scope of applications which include wound dressings. Nevertheless, several studies denote AgNPs dose-dependent cytotoxicity, and their capability to bypass the blood-brain barrier and induce a neurotoxic effect. Hence, we propose to adopt two different strategies to attempt the simultaneously immobilize and increase the load of AgNPs within the wound dressing fabric. Thus, the envisaged objective is to prevent potential systemic cytotoxicity/through immobilization and to improve its antimicrobial capability due to the higher concentration of AgNPs. Two different approaches were used: i. AgNPs were suspended in an alginate (ALG) solution, ii. AgNPs were embedded in Mordenite (MOR) zeolite, followed by the addition of an ALG solution. Both suspensions were incorporated into polyester fabric assisted by its surface activation by dielectric barrier discharge (DBD) plasma treatment. The bactericidal and virucidal effectiveness of each composite was tested against bacteria species known to induce nosocomial infections and a bacteriophage that is a potential surrogate of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Two distinct antimicrobial analyses were used to provide insights on the antimicrobial effectiveness of the obtained composites and to indirectly assess the release of AgNPs.

Leukocytoclastic vasculitis secondary to COVID-19 vaccine

We present the case of a severe cutaneous reaction following COVID-19 vaccination. A 60-year-old white woman presented to our service with an extensive painful, pruritic rash affecting her bilateral lower limbs. This was on a background of psoriasis, psoriatic arthritis and notably inoculation against COVID-19 with the Johnson & Johnson vaccine hours prior to onset. There was no history of new medications, illicit drug use or infections. On examination, extensive palpable purpura was noted circumferentially at both lower limbs from the knee distally. Tense bullae were described at her bilateral ankles. She was apyrexial. Her cardiopulmonary and gastrointestinal examinations were normal. A punch biopsy taken from her right lower limb demonstrated findings consistent with leucocytoclastic vasculitis (LCV). Direct immunofluorescence demonstrated IgA deposits within the vasculature. IgA LCV secondary to COVID-19 vaccination was proposed on the basis of histological and clinical findings. Treatment consisted of oral steroids, oral antibiotics for secondary infection and wound dressings. Opioid analgesia and nitrous oxide were implemented for severe pain associated with dressing changes. As her urinary protein creatinine ratio was in excess of 100 mg dL-1 and microscopic haematuria was noted on urine microscopy, she was referred to nephrology. We note case reports of patients diagnosed with LCV up to 2 weeks following COVID-19 vaccination (Cavalli G, Colafrancesco, De Luca G et al. Cutaneous vasculitis following COVID- 19 vaccination. Lancet Rheumatol 2021;3: E743-4). In this case, onset of symptoms occurred within hours. While this presentation may have been coincidental, the relationship between immune complex vasculitis, COVID-19 infection (Iraji F, Galehdari H, Siadat AH, Bokaei Jazi S. Cutaneous leukocytoclastic vasculitis secondary to COVID-19 infection: a case report. Clin Case Rep 2020;9: 830-4) and vaccination (Cavalli et al.) has been reported in the literature and represents the most likely diagnosis.

Furuncular myiasis by Wohlfahrtia magnifica (Diptera: Sarcophagidae) in a healthy child

Rationale: Human myiasis is the invasion of tissue or organs by fly larvae. This could be obligatory, facultative, or accidental. Patient concerns: A 4-year-old Saudi boy complained of fever over the past three days with multiple inflamed painful dermal furuncles and worms-like discharge. Diagnosis: Furuncular obligatory myiasis caused by Wohlfahrtia magnifica. Interventions: Maggots were removed for identification. The wounds were cleaned with antiseptic dressings. Topical and oral antibiotics were applied. Outcomes: Seven days later, the wounds completely healed. Lessons: Although several reports correlated human myiasis with old age, low health status, mental retardation, and low socioeconomic status, but the patient in our case was a healthy child from a family with good socioeconomic status, good hygiene, no history of diseases or mental disability, but traveled to a village where the climate is suitable for fly breeding.

Preparing and Characterizing Novel Biodegradable Starch/PVA-Based Films with Nano-Sized Zinc-Oxide Particles for Wound-Dressing Applications

Given recent worldwide environmental concerns, biodegradability, antibacterial activity, and healing properties around the wound area are vital features that should be taken into consideration while preparing biomedical materials such as wound dressings. Some of the available wound dressings present some major disadvantages. For example, low water vapor transmission rate (WVTR), inadequate exudates absorption, and the complex and high environmental cost of the disposal/recycling processes represent such drawbacks. In this paper, starch/polyvinyl alcohol (PVA) material with inserted nano-sized zinc-oxide particles (nZnO) (average size ≤ 100 nm) was made and altered using citric acid (CA). Both ensure an efficient antibacterial environment for wound-dressing materials. The film properties were assessed by UV–Vis spectrometry and were validated against the UV light transmission percentage of the starch/ polyvinyl alcohol (PVA)/ zinc-oxide nanoparticles (nZnO) composites. Analyses were conducted using X-ray Spectroscopy (EDX) and scanning electron microscopy (SEM) to investigate the structure and surface morphology of the materials. Moreover, to validate an ideal moisture content around the wound area, which is necessary for an optimum wound-healing process, the water vapor transmission rate of the film was measured. The new starch-based materials exhibited suitable physical and chemical properties, including solubility, gel fraction, fluid absorption, biodegradability, surface morphology (scanning electron microscopy imaging), and mechanical properties. Additionally, the pH level of the starch-based/nZnO film was measured to study the prospect of bacterial growth on this wound-dressing material. Furthermore, the in vitro antibacterial activity demonstrated that the dressings material effectively inhibited the growth and penetration of bacteria (Escherichia coli, Staphylococcus aureus).

Polysaccharide Stalks in Didymosphenia geminata Diatom: Real World Applications and Strategies to Combat Its Spread

Didymosphenia geminata is a species of freshwater diatom that is known as invasive and is propagating quickly around the world. While invasive species are generally considered a nuisance, this paper attempts to find useful applications for D. geminata in the biomedical field and wastewater remediation. Here, we highlight the polysaccharide-based stalks of D. geminata that enable versatile potential applications and uses as a biopolymer, in drug delivery and wound healing, and as biocompatible scaffolding in cell adhesion and proliferation. Furthermore, this review focuses on how the polysaccharide nature of stalks and their metal-adsorption capacity allows them to have excellent wastewater remediation potential. This work also aims to assess the economic impact of D. geminata, as an invasive species, on its immediate environment. Potential government measures and legislation are recommended to prevent the spread of D. geminata, emphasizing the importance of education and collaboration between stakeholders.

Application of Chitosan and Its Derivative Polymers in Clinical Medicine and Agriculture.

Chitosan is a biodegradable natural polymer derived from the exoskeleton of crustaceans. Because of its biocompatibility and non-biotoxicity, chitosan is widely used in the fields of medicine and agriculture. With the latest technology and technological progress, different active functional groups can be connected by modification, surface modification, or other configurations with various physical, chemical, and biological properties. These changes can significantly expand the application range and efficacy of chitosan polymers. This paper reviews the different uses of chitosan, such as catheter bridging to repair nerve broken ends, making wound auxiliaries, as tissue engineering repair materials for bone or cartilage, or as carriers for a variety of drugs to expand the volume or slow-release and even show potential in the fight against COVID-19. In addition, it is also discussed that chitosan in agriculture can improve the growth of crops and can be used as an antioxidant coating because its natural antibacterial properties are used alone or in conjunction with a variety of endophytic bacteria and metal ions. Generally speaking, chitosan is a kind of polymer material with excellent development prospects in medicine and agriculture.