Aerosol charge neutralization and its impact on particle filtration efficiency of common face mask materials

Despite the significant increase in research on mask filtration testing since the COVID-19 pandemic, there remains considerable ambiguity regarding which parameters affect particle filtration efficiency (PFE) and how differences in standard testing protocols can lead to divergent PFE values. We evaluated the PFE (and differential pressure) of several common face masks and community face mask materials including woven cotton, spunbond polypropylene, and meltblown polypropylene, testing in accordance with ASTM F2100/2299 standards for medical masks, using polystyrene latex (PSL) aerosol, as well as NIOSH standards for respirators, using NaCl aerosol. In both cases, PFE was measured with and without aerosol charge neutralization, which is used to bring the particle population to a known, equilibrium bipolar charge distribution. Aerosols of either composition that were not neutralized (untreated) led to significant increases in measured PFE, especially in the case of PSL. In contrast, effective neutralization led to lower PFE measurements that also showed little to no dependence on aerosol composition across most materials. To investigate further, the bipolar charge distributions of PSL and NaCl aerosols, both neutralized and untreated, were characterized using an aerodynamic aerosol classifier operated in tandem with a scanning mobility particle sizer (AAC-SMPS). This technique illustrated the differences in the distribution of particle charge states between PSL and NaCl aerosols of the same size, and between PSL particles of different sizes, revealing the presence of highly charged particles in many cases. Most importantly, the equilibrium charge distribution after neutralization is shown to be independent of particle composition or initial charge distribution, highlighting the crucial role of aerosol charge neutralizers in preventing overestimates of mask performance (due to electrostatic effects) and promoting consistency in standard testing procedures.

Development of a low-cost model for laparoscopic pyeloplasty simulation

Aims: Simulation is increasingly important in the training of paediatric urology;training time lost due to the Covid-19 pandemic, patient safety concerns and the uptake of technology (i.e., robotics) means that trainees must develop new methods of attaining operative competency. Laparoscopic pyeloplasty can be technically challenging and involves a steep learning curve to be confident in performing this procedure independently. We therefore aimed to develop a low-cost, high-fidelity model which trainees could create using easily available materials. Method(s): Unique Party Balloon (Unique Party Store)-1200 Scarlet Red (pack of 10) [2.34] were filled with cotton wool pads (2 packs of 50 rounds 1-Aldi) and fashioned into a kidney shape. Pink 102 latex Balloons (PABBEU) [4.99] were filled with a 50 ml of water to create the renal pelvis and superglued (Loctite pack of 3, Ryman) [4.99] to the kidney. Then Long Pastel Twisting Balloons (pack of 50)-[4.29] were attached over the tied end of the renal pelvis creating the ureter. The model was then secured into the Laparoscopic box trainer using Velcro Hook and Loop Coins (Syntego, 105 pack) [2.95]. Result(s): The model was utilised in departmental skills sessions. Feedback demonstrated the model provided a realistic feel performing the anastomosis due to the latex, water-filled, balloons. Total cost per model was 1.10 (20 models). Conclusion(s): We demonstrate a low-cost model of laparoscopic pyeloplasty which trainees can create easily themselves. However, further work will be needed to improve the model for anatomical relations, particularly crossing vessels.

Clinical and quality of life assessment in patients with latex allergy during COVID-19 pandemic: Possible protective role of continuous latex immunotherapy

Background: During Covid-19 pandemic, the massive use of Personal Protective Equipment could provoke severe adverse reactions in latex allergy patients and could negatively affect their quality of life. Method(s): The observational single-centre present study was carried out on 67 adult subjects with a latex allergy diagnosis followed by Allergy Unit of Fondazione Policlinico Universitario A. Gemelli IRCCS of Rome. All data were collected from January 2020 to December 2020. All patients underwent to a survey focused on their clinical and psychological conditions during Covid-19 pandemic. For the evaluation of the degree of well-being, we used SF-36 questionnaire (Short-Form 36-Item Health Survey). The aim of our study is: (a) to evaluate the incidence of allergic reactions in patients with latex allergy during the SARS-CoV- 2 pandemic;(b) to evaluate the protective role of continuous latex ITS during this period;(c) to evaluate quality of life of natural rubber latex allergy (NRLA) patients during the pandemic. Result(s): 67 patients (9 males and 58 females, mean age of 45.9 +/- 11.4 years) suffered from latex allergy were included in the present study. We recorded among our patients 13 cases (34.2%) of urticarial/ angioedema (U/A), 9 cases (23.6%) of respiratory symptoms (RS;dyspnoea, shortness of breath, wheezing) and 7 cases (18.4%) of anaphylaxis. In patients undergone continuous ITS, we observed less cases of U/A (p < 0.001), RS (p < 0.001), anaphylaxis (p = 0.003), hospitalizations (p = 0.014) and a lower therapy administration. We compared the results of SF-36 questionnaire in patients undergone continuous and not continuous latex ITS with a significance differences score between these two groups. Conclusion(s): The pandemic challenged the capacity of healthcare systems to provide adequate management of NRLA patients and in this context, we performed a survey to monitor their health status. During the pandemic, the risk of latex exposure was significant increased considering the possibility of direct skin contact, airborne exposure, contamination of food and medical evaluations. Our study is the first that investigated the clinical and quality of life effects of Covid-19 pandemia in NRLA patients demonstrating the importance of SLIT adherence also in this complex period. (Table Presented).

Anaphylactic shock induced by a depot corticosteroid: Reflections on a clinical case

Introduction (contexte de la recherche): IgE-mediated reactions to systemic corticosteroids (CSs) are rare. Hydrocortisone and methylprednisolone succinate ester are the most frequent elicitors. Excipients of depot corticosteroids (like carmellose or macrogol) may also be involved. The involvement of the dipropionate form of betamethasone (present in the depot Diprostene) has not been studied. Objectif: To describe the case of a 40-year-old woman, who presented an anaphylactic shock reaction upon intra-articular administration of Diprostene (Betamethasone sodium phosphate and betamethasone dipropionate), associated with an iodinated radiocontrast media (ICM, Xenetix). Methodes: An allergy work-up was performed, according to recommendations for severe immediate reactions. Nine months after the reaction [hypotension (7/5 mmHg), erythema and desaturation at 94%, treated with adrenalin, methylprednisolone hemisuccinate, dexchlorpheniramine] the patient underwent skin prick tests (SPT) and intradermal tests (IDT) with ICM, bethamethasone and Diprostene (commercial molecules). Latex and chlorexidine were also studied. Resultats: The tests resulted negative for ICM, latex and chlorexidine (including serum specific IgE ImmunoCAP ThermoFisher Scientific), bethametasone phosphate (IDT 0.4 mg/mL) and carmellose (IDT 0.5 mg/mL). SPT elicited a positive reaction towards Diprostene in immediate reading, (for 5, 0.5, 0.05 mg/mL) with an erythema (10, 8, 5 mm respectively) and a wheal (of at least 3 mm for each SPT). We performed an oral drug challenge to bethametasone phosphate for a total of 8 mg and it was well tolerated. The basal tryptase was 5.5 microg/mL. Tryptasemia 30 minutes after the reaction was 26.8 microg/mL. Conclusion(s): We describe an anaphylactic reaction to Diprostene, proven by positive ST. The hypothesis of allergy to betamethasone dipropionate is under investigation. The hypothesis of allergy to macrogol, the other excipient of (which was not tested separately) is less likely, since the patient received Commirnaty SARS-CoV-2 vaccine 3 months after the reaction. The allergy work-up is ongoing (tests are programmed for betamethasone dipropionate alone).Copyright © 2023

Nanokaolin reinforced carboxylated nitrile butadiene rubber/polyurethane blend-based latex with enhanced tensile properties and chemical resistance

The demand for gloves (e.g., disposable gloves, medical gloves) is increasing due to the Coronavirus disease 2019 (COVID-19) pandemic. Stability in the supply chain in the glove industry is important, and thus strategies are used to solve the problem of the shortage of nitrile gloves. The blending of nitrile butadiene rubber (NBR) with polyurethane (PU) and the use of the nanocomposite concept is among the feasible approaches. The present study aims to investigate the effects of nanokaolin (NK) on the tensile and chemical properties of carboxylated nitrile butadiene rubber (NBR)/polyurethane (PU) latex blends. Three different loadings of NK (10, 20, and 30 parts per hundred rubber) were added to the NBR/PU (at a blending ratio of 85/15). The zeta potential showed that all the NBR compounds exhibit good colloidal stability. The incorporation of NK increased the crosslink density and tensile strength of the NBR/PU latex blends. The highest tensile strength was achieved when the NK loading was 20 phr. All the NBR blends and nanocomposites (NBR/PU-based) possess tensile properties that fulfill the requirements for glove application. The chemical resistance of NBR compounds was increased by the incorporation of NK due to the higher crosslink density and barrier properties contributed by the NK. © The Author(s) 2023.

The successful use of Pezzer Catheter in Covid-19 patients

Introduction: Severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) was often during the pandemic era. Over 3500 patients were treated in our hospital and approximately 400 required mechanical ventilation and presented pneumothorax due to barotrauma. We present our experience in cases of recurrent or loculated pneumothoraces in Covid-19 patients treated successfully with the use of Pezzer catheter. Material(s) and Method(s): Cases were collected retrospectively based on author recall. Ninety-one intubated patients ranging in age from 65 to 78 years presented with pneumothoraces. A 28 French Argyle intercostal catheter was inserted initially, resulting in re-expansion. Despite the above treatment 41 patients (45%) were unstable with recurrent or loculated pneumothoraces and one found hard to ventilate them. So, a Pezzer catheter made of Latex was placed at the site of the loculated pneumothorax. Result(s): All pneumothoraces were resolved within 3 days after the insertion of a Pezzer catheter and the subcutaneous emphysema decreased significantly. There were no major complications recorded. Conclusion(s): 1. It is well known that the most basic issue that may have an impact on airleaks is chest tube management. That is the reason we concentrated on the type and position of chest drain. 2. Our experience supports the use of Pezzer catheter connected to water seal in cases of persistent pneumothorax with prolonged air leak and increasing subcutaneous emphysema, since it promotes pleurodesis, reduces significantly the duration of the intrapleural drainages and the length of the in-hospital stay. 3. The procedure is cost-effective, safe, and easy to perform.

Getting to the root of it: contact anaphylaxis from polyethylene glycol in a dental lubricant

A 46-year-old man with no known allergies or history of atopy was referred for the investigation of a severe anaphylactic reaction following root canal dental treatment. The procedure had been done under local anaesthetic and involved drilling the tooth, removal of dental pulp, cleaning and insertion of a temporary filling. Preliminary skin prick tests (SPTs) and intradermal tests were negative to natural rubber latex, articaine (the local anaesthetic used for his procedure), lidocaine and chlorhexidine. He had negative specific IgE to chlorhexidine and latex, and a negative lidocaine challenge, confirming that he was not allergic to lidocaine. He returned for further dental treatment, which was done without local anaesthetic. As the procedure was completed, he developed severe anaphylaxis again. He made a full recovery and his dentist was asked for detailed information and samples of all the materials used during the procedure. Subsequent SPT showed a positive weal of 12 x 6 mm to the dental lubricant, Glyde, which was used on both occasions. Its ingredients included polyethylene glycol (PEG) 4253. SPT to other high-weight macrogol-containing products showed positive reactions to a 5% lidocaine ointment, Movicol, EMLA cream and Depomedrone. On further questioning he recalled minor immediate irritation after using a brand of children's shampoo, but a SPT to the shampoo was negative. An open test, closed test and SPT to a lower-molecular-weight patch-test allergen (PEG400 in petrolatum) were negative. PEGs or 'Macrogols' are hydrophilic polymers used in food, cosmetics and pharmaceutical reagents. They have recently attracted attention as they are excipients in several COVID-19 vaccines and have been suggested as a possible cause of anaphylaxis. Anaphylaxis to higher-molecular-weight PEGs has been reported from the use of bowel preparations and parenteral steroids. There are a handful of reports of contact urticaria to PEG-containing medicaments. We report this case to raise awareness of severe immediate hypersensitivity to these apparently innocuous ingredients and a novel source of exposure. A low index of suspicion, lack of standardized nomenclature and commercial reagents for testing are current barriers to diagnosis.

Antioxidating and reinforcing effect of polydopamine functionalized silica on natural rubber latex films

Since the outbreak of COVID-19, the demand for natural latex products with increased mechanical properties and aging resistance has surged. Based on the excellent adhesion and antioxidant properties of polydopamine (PDA), we employed a one-pot method to modify the surface of silica substrates using PDA containing a polyphenol structure, to prepare a reinforced silica-PDA composite latex material with antioxidant properties. As expected, the silica-PDA composite achieved both uniform dispersion and good interfacial interactions with natural rubber latex (NRL). In addition, compared with common NRL/silica films, the mechanical properties of the NRL/silica-PDA film were significantly improved;specifically, silica-PDA can highly-enhanced the mechanical property of NRL film from 24.94 to 32.18 MPa of tensile strength. Further, the antioxidant activity of the silica-PDA film exceeded that of commercially available antioxidant D. Considering the notable performance boost of silica-PDA composites on NRL films, we believe that the treatment of silica with natural polyphenols offers a convenient and facile new route for the preparation of environmentally friendly multifunctional silica additives. © 2023 Wiley Periodicals LLC.

Allergy and COVID Vaccines

We have been experiencing more allergic reactions to vaccines during the recent pandemic. Severe allergic reactions to vaccines are rare and difficult to predict. It might be defined as an idiosyncratic reaction caused by an immunologic mechanism. Regarding the World Allergy Organization (WAO) recommendation, immunologic reactions to drugs are categorized based upon the timing of the appearance of symptoms. This system defines two general types of reactions: immediate and delayed. Recently COVID vaccines are broadly applied worldwide. The CDC has provided the following differentiation: (1) contraindication: persons with a known (diagnosed) allergy to PEG, polysorbate, or another component of a COVID-19 vaccine or who have experienced a severe allergic reaction (e.g., anaphylaxis) after a previous COVID-19 vaccine dose have a contraindication to vaccination;(2) precaution: persons with an immediate allergic reaction to other (non-COVID-19) vaccines or injectable therapies OR a non-severe immediate allergic reaction (onset < 4 hours) after a previous dose of COVID-19 vaccine fall into this category. May proceed with COVID-19 vaccine: (1) persons with a history of food, pet, insect, venom, environmental, oral medication (including the oral equivalent of an injectable medication) or latex allergies;or (2) a family history of allergies. Other reactions like vaccineinduced immune thrombotic thrombocytopenia (VITT) or thrombosis-thrombocytopenia syndrome (TTS) have been reported with adenoviral vector covid-19 vaccines. Myocarditis/pericarditis and Guillain-Barre Syndrome are also reported with COVID vaccines. Results of safety monitoring from VAERS and V-safe after one month of vaccinations show that over 90% of reactions were nonserious. Anaphylaxis rates (4.5 per million doses) remain in the range of other vaccines. The female gender may be a risk factor for adverse reactions and anaphylaxis. To sum up, COVID vaccines are very safe, and severe allergic reactions are exceedingly rare.

Allergic History and Anaphylaxis in COVID-19 Vaccines: A Disproportionality Analysis in the FDA Vaccine Adverse Event Reporting System: An International Journal of Medical Toxicology and Drug Experience

Introduction: Many pre- and post-marketing studies on Covid-19 vaccines investigated their safety in the overall population. Little information is available on cohorts with specific comorbidities. Few studies evaluate the safety in allergic subjects, in particular as related to the anaphylaxis risk. Objective: To investigate the association between anaphylaxis after Covid-19 vaccines and the history of hypersensitivity reactions to the most common allergens. Methods: The Vaccine Adverse Event Reporting System (VAERS, January 2020-December 2021) was downloaded and cleaned. We focused on reports of Adverse Events Following Immunization (AEFIs) following COVID-19 vaccination in subjects > 12 years old with history of allergy. We performed a descriptive analysis and calculated the Reporting Odds Ratio (ROR) to identify demographic characteristics and allergic histories disproportionally reported with anaphylaxis for each Covid-19 vaccine and the most recorded allergens. Results: We retrieved 183,860 AEFI reports recording any allergic history (864 anaphylaxis reports among cases vs 6,162 in Covid-19 reports without history of allergy). They concerned mostly women (81.3%) and adults (74.0%). Almost all reports were submitted in the US (99.7%) and 38.3% of them resulted in hospitalization. Covid-19 vaccines administered were Spikevax (49.3%), Comirnaty (42.1%), and Janssen (8.4%). The antigens most recorded as allergens were penicillins (49,407), sulfa drugs (37,365), opioids (26,398), seafood (12,039), latex (11,442), NSAIDs (11,319), cephalosporins (8,379), quinolones (8,023), macrolides (7,586). Seafood allergy resulted associated with anaphylaxis for Comirnaty (ROR = 2.80;95% CI 2.20-3.56), Spikevax (2.57;1.88-3.51), and Janssen (2.67;1.39-5.11). Latex allergy was associated with anaphylaxis for Comirnaty (ROR = 1.92;95% CI 1.45-2.55). Conclusion: We gathered evidence pointing towards a preferential development of anaphylaxis in patients with an history of hypersensitivity to seafood (for all Covid-19 vaccines) or latex (restricted to Comirnaty). Whether confirmed by further studies, this knowledge may drive a more practical anamnesis and a prompt management of anaphylactic reactions.

Opium poisoning following self-medication of radiation-induced dermatitis with topical use of opium latex traditional extract; a teaching case.

Despite Radiation-induced dermatitis is a self-limiting complication, it can be complicated if inappropriate self-medications have been used such as opium latex traditional extract.

Rapid detection of porcine circovirus type 2 by a red latex microsphere immunochromatographic strip.

To establish a rapid and specific antigen detection method for porcine circovirus type 2 (PCV2), monoclonal antibodies (mAbs) were produced against the PCV2 epidemic strains and a red latex microsphere immunochromatographic strip was established. A total of eight anti-PCV2b and four anti-PCV2d mAbs were produced, and seven mAbs were confirmed to react with PCV2a, PCV2b, and PCV2d strains using an immunoperoxidase monolayer assay. The results of micro-neutralization tests showed that the mAbs 2C8, 9H4, 10G7, 7B9, and 7C7 had good neutralizing activity, whereas the neutralizing activity of the mAbs 4B3, 4C9, 6H9, and 7E2 was lower than 50%. Three mAbs, 4B3, 7C7, and 9H4, and PCV2 pAb were selected for the establishment of a red latex microsphere immunochromatographic strip, and the combination of mAb 7C7 labeled with red latex microspheres and mAb 9H4 exhibited the greatest detection ability. The immunochromatographic strip had minimum detection limits of 102.5 TCID50/0.1 ml, 100.7 TCID50/0.1 ml, and 101.5 TCID50/0.1 ml for PCV2a/CL, PCV2b/MDJ, and PCV2d/LNHC, respectively. Furthermore, no cross-reactivity was found for African swine fever virus, classical swine fever virus, porcine respiratory and reproductive syndrome virus, porcine parvovirus, porcine pseudorabies virus, porcine circovirus type 1, transmissible gastroenteritis virus, porcine epidemic diarrhea virus, porcine rotavirus, or porcine deltacoronavirus using the immunochromatographic strip. Using PCR as a reference standard, the detection sensitivity, specificity, and overall coincidence rate of the immunochromatographic strip were 81.13%, 100%, and 90.00%. Additionally, the detection ability of the immunochromatographic strip was correlated with that of virus titration. The immunochromatographic strip was used to detect 183 clinical disease samples, and the average positive detection rate was 22.95%. In summary, this method has good sensitivity and specificity and is simple, convenient, and quick to operate. It has high application value for on-site diagnosis of PCV2 and virus quantification. KEY POINTS: • A red latex microsphere immunochromatographic strip for PCV2 detection was developed. • The method was not only simple to operate, but also takes less time. • The method had good sensitivity and specificity.

Threats to operating room personnel's occupational safety and health: a qualitative study

Background & Objective: Every operating room has been associated with a variety of occupational hazards, but not many studies have been conducted to assess and address these hazards. We used a qualitative approach to explore operating room personnel's experiences of workplace hazards and how these hazards threaten their occupational safety and health (OSH). Methodology: This qualitative study was conducted in five teaching hospitals in the south-west of Iran from February 2019 to March 2021. The sample was 24 operating room personnel who were selected under convenient sampling technique. Data were collected using semi-structured, individual interviews, document review and non-participant observation. The collected data were analyzed according to the qualitative content analysis method using MAXQDA v. 2020. Results: After prolonged analysis of the data, the researchers extracted 644 codes, 13 subcategories, 4 categories, and 1 main theme. The main theme of the study was working in a context of occupational hazards. Conclusions: Operating rooms are full of potential dangers, which, when combined with the personnel's negligence and management inefficiencies, increase the risk of occupational health and safety. Therefore, making working conditions safe by providing adequate personal protective equipment (PPE), in-service training, and identifying and managing the causes of personnel negligence are recommended. Moreover, strategies should be introduced to manage stress and conflicts among the healthcare personnel, thus controlling psychological hazards.

Glove Manufacturing: Opportunities and Challenges in Control Engineering

The glove manufacturing industry has seen tremendous growth recently, spurred on by the COVID-19 pandemic. A long-standing shortage of supply of disposable medical gloves has highlighted an urgent need to increase production capacity. This requires glove manufacturers to be quick in adopting best practices, in line with Industry 4.0, in order to optimize various aspects of the industry. Unfortunately, information available in the existing literature is, however, limited due to the confidential nature of the majority of research in this area. This article discusses some opportunities and challenges related to this important chemical industry, from the perspective of control engineering. These insights can point to some interesting directions of future work. Copyright (C) 2022 The Authors.

Anticancer, Anticoagulant, Antioxidant and Antimicrobial Activities of Thevetia peruviana Latex with Molecular Docking of Antimicrobial and Anticancer Activities.

Natural origin molecules represent reliable and excellent sources to overcome some medicinal problems. The study of anticancer, anticoagulant, and antimicrobial activities of Thevetia peruviana latex were the aim of the current research. An investigation using high-performance liquid chromatography (HPLC) revealed that the major content of the flavonoids are rutin (11.45 µg/mL), quersestin (7.15 µg/mL), naringin (5.25 µg/mL), and hisperdin (6.07 µg/mL), while phenolic had chlorogenic (12.39 µg/mL), syringenic (7.45 µg/mL), and ferulic (5.07 µg/mL) acids in latex of T. peruviana. Via 1,1-diphenyl-2- picrylhydrazyl (DPPH) radical scavenging, the experiment demonstrated that latex had a potent antioxidant activity with the IC50 43.9 µg/mL for scavenging DPPH. Hemolysis inhibition was 58.5% at 1000 µg/mL of latex compared with 91.0% at 200 µg/mL of indomethacin as positive control. Negligible anticoagulant properties of latex were reported where the recorded time was 11.9 s of prothrombin time (PT) and 29.2 s of the activated partial thromboplastin time (APTT) at 25 µg/mL, compared with the same concentration of heparin (PT 94.6 s and APPT 117.7 s). The anticancer potential of latex was recorded against PC-3 (97.11% toxicity) and MCF-7 (96.23% toxicity) at 1000 µg/mL with IC50 48.26 µg/mL and 40.31 µg/mL, respectively. Disc diffusion assessment for antimicrobial activity recorded that the most sensitive tested microorganisms to latex were Bacillus subtilis followed by Escherichia coli, with an inhibition zone (IZ) of 31 mm with minimum inhibitory concentration (MIC) (10.2 µg/mL) and 30 mm (MIC, 12.51 µg/mL), respectively. Moreover, Candida albicans was sensitive (IZ, 28 mm) to latex, unlike black fungus (Mucor circinelloides). TEM examination exhibited ultrastructure changes in cell walls and cell membranes of Staphylococcus aureus and Pseudomonas aeruginosa treated with latex. Energy scores of the molecular docking of chlorogenic acid with E. coli DNA (7C7N), and Rutin with human prostate-specific antigen (3QUM) and breast cancer-associated protein (1JNX), result in excellent harmony with the experimental results. The outcome of research recommended that the latex is rich in constituents and considered a promising source that contributes to fighting cancer and pathogenic microorganisms.

Natural Rubber (NR) Latex Films with Antimicrobial Properties for Stethoscope Diaphragm Covers

Systematic disinfection of the stethoscope diaphragm is required to ensure that it does not act as a vector for cross-transmission of health-related diseases. Thus, an antimicrobial latex film could be used as a cover to inhibit pathogenic bacteria from growing on its surface. The aim of this work is to determine the antimicrobial activity and mechanical properties of antimicrobial natural rubber (NR) latex films with different types of antimicrobial agents (mangosteen peel powder (MPP), zinc oxide nanoparticles (ZnO NP), and povidone-iodine (PVP-I)). The antimicrobial loading was varied from 0.5, to 1.0, and 2.0 phr to monitor the effective inhibition of Gram-negative bacteria and fungi growth. For MPP and PVP-I antimicrobial agents, a loading of 2.0 phr showed good antimicrobial efficacy with the largest zone of inhibition. Simultaneously, ZnO NP demonstrated excellent antimicrobial activity at low concentrations. The addition of antimicrobial agents shows a comparable effect on the mechanical properties of NR latex films. In comparison to control NR latex film (29.41 MPa, 48.49 N/mm), antimicrobial-filled films have significantly greater tensile and tear strengths (MPP (33.84 MPa, 65.21 N/mm), ZnO NP (31.79 MPa, 52.77 N/mm), and PVP-I (33.25 MPa, 50.75 N/mm). In conclusion, the addition of antimicrobial agents, particularly ZnO NP, can be a better choice for NR latex films because they will serve as both an activator and an antimicrobial. In a clinical context, with regard to frequently used medical equipment such as a stethoscope, such an approach offers significant promise to aid infection control.

Aerosol capture and coronavirus spike protein deactivation by enzyme functionalized antiviral membranes

The airborne nature of coronavirus transmission makes it critical to develop new barrier technologies that can simultaneously reduce aerosol and viral spread. Here, we report nanostructured membranes with tunable thickness and porosity for filtering coronavirus-sized aerosols, combined with antiviral enzyme functionalization that can denature spike glycoproteins of the SARS-CoV-2 virus in low-hydration environments. Thin, asymmetric membranes with subtilisin enzyme and methacrylic functionalization show more than 98.90% filtration efficiency for 100-nm unfunctionalized and protein-functionalized polystyrene latex aerosol particles. Unfunctionalized membranes provided a protection factor of 540 ± 380 for coronavirus-sized particle, above the Occupational Safety and Health Administration’s standard of 10 for N95 masks. SARS-CoV-2 spike glycoprotein on the surface of coronavirus-sized particles was denatured in 30 s by subtilisin enzyme-functionalized membranes with 0.02-0.2% water content on the membrane surface.The COVID-19 pandemic highlights the importance of materials that block airborne virus transmission. Here, a nanostructured membrane is shown to filter coronavirus-sized particles, while the membrane surface incorporates enzymes that denature the SARS-CoV-2 spike protein within 30 s.

Clinical and quality of life assessment in patients with latex allergy during COVID-19 pandemic: Possible protective role of continuous latex immunotherapy.

Introduction: During COVID-19 pandemic, the massive use of Personal Protective Equipment could provoke severe adverse reactions in latex allergy patients and could negatively affect their quality of life. Methods: Trough a survey the study aimed: (a) to evaluate the incidence of allergic reactions in patients with latex allergy during the SARS-CoV-2 pandemic; (b) to evaluate the protective role of continuous latex sublingual immunotherapy (SLIT) during this period; and (c) to evaluate quality of life of natural rubber latex allergy (NRLA) patients during the pandemic. Results: 67 patients (9 males and 58 females, mean age of 45.9 ± 11.4 years) suffering from latex allergy were included in the present study. We recorded among our patients 13 cases (34.2%) of urticarial/angioedema (U/A), 9 cases (23.6%) of respiratory symptoms (dyspnoea, shortness of breath and wheezing) and 7 cases (18.4%) of anaphylaxis. In patients who underwent continuous SLIT, we observed less cases of U/A (p < 0.001), respiratory symptoms (p < 0.001), anaphylaxis (p = 0.003), hospitalizations (p = 0.014) and a lower therapy administration. We compared the results of SF-36 questionnaire in patients who underwent continuous and not-continuous SLIT with a significance differences score between these two groups. Conclusions: Our study is the first that investigated the clinical and quality of life effects of COVID-19 pandemic in NRLA patients.

Estimation of Ferritin and D-Dimer levels in COVID-19 Patients with Mucormycosis- A Cross-sectional Study

Introduction: There are increasing reports of the occurrence of fungal co-infections in Coronavirus disease 2019 (COVID-19) patients resulting in severe morbidity among predisposed individuals. Mucormycosis is an Invasive Fungal Infection (IFI). Early anticipation and identification of fungal co-infections can significantly reduce morbidity rate among COVID-19 infected patients. Aim: To determine quantitatively the levels of ferritin and D-dimer in COVID-19 infected patients with mucormycosis. Materials and Methods: This cross-sectional study included 84 Real Time Polymerase Chain Reaction (RT-PCR) positive for COVID-19 Virus in oropharyngeal swab patients from June 2021 to August 2021 at Sri Devaraj Urs Medical College, Kolar, Karnataka, India. A total of 84 COVID-19 infected patients were included in the study. D-dimer and ferritin levels were measured in the patient's blood sample using Latex Enhanced Immunoturbidimetric method in Vitros 5.1 FS and Vitros Eci Immunodiagnostics respectively. Continuous data represented as mean and standard error of mean, Kruskal-Wallis Test and Mann-Whitney U test was used to test significance, p-value <0.05 was considered as statistically significant. Results: Of the 84 COVID-19 Infected patients, 40 were included in group 1, 25 patients in group 2 and 19 patients in Group 3. A total of 21 patients were aged between 20-40 years, 48 patients between 41-60 years age group and 15 patients were in 61-80 years of age group. The number of male patients was 63 and female patients were 21. The D-dimer levels were 1259.37±258. 9, 2632.60±472.6 and 229.53±18.4 (p-value <0.001) and ferritin levels were 528.58±45.03, 511.48±74.4, and 256.89±51.8 (p-value <0.007), respectively. Conclusion: Serum ferritin and plasma D-dimer were significantly elevated in COVID-19 patients with mucormycosis. Mucormycosis in COVID-19 patients without pre-existing co-morbidities may be attributed to the use of steroid therapy in these patients for COVID-19 infection. Thus, serum ferritin and plasma dimer levels may have a significant predictive role in the risk assessment for the development of mucormycosis among COVID-19 infected patients.