Efficacy of chlorin dioxide wipes in disinfecting airway devices contaminated with Covid-19.

Background: Reprocessing and disinfecting endoscopes is a routine practice in otolaryngology. An effective, safe, and rapid disinfection technique is essential during the COVID-19 pandemic. Objective: To validate the efficacy of chlorine dioxide wipes in disinfecting three types of airway endoscopes contaminated with COVID-19-positive patient secretions. Methods: Chlorine dioxide wipes were tested on rigid nasal endoscopes, laryngoscope blades, and flexible bronchoscopes. The endoscopes were disinfected using the wipes after exposure to COVID-19-positive patients. The tested scope was included in the study if the post procedure pre disinfection swab was positive for COVID-19 virus using RT-PCR. We analyzed 38 samples for 19 subjects (scopes) pre and post disinfection with chlorine dioxide wipes from July 2021 to February 2022. Results: A total of four rigid endoscopes, four flexible bronchoscopes, and four laryngoscopes were included in the study which represent 24 pre and post disinfection swabs. The others were excluded because of negative pre disinfection swab. All the post disinfection PCR swab results were negative. Conclusion: Chlorine dioxide is a convenient, fast, and effective disinfection technique for COVID-19-contaminated airway endoscopes.

In vitro antiviral activity of stabilized chlorine dioxide containing oral care products.

OBJECTIVE: To determine the in vitro antiviral activity of oral care products containing stabilized chlorine dioxide toward infectious viruses that harbor in the oral cavity. Specfically, severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2), SARS-CoV, human coronavirus (HCoV) 229E, influenza A (H3N2), rhinovirus type 14, adenovirus type 5, and herpes simplex virus (HSV) type 1 and 2 were examined. METHODS: Validated in vitro suspension virucidal assays were used. Test product was mixed with the test virus for 30, 60, or 120 s, neutralized with sodium thiosulfate, serially diluted in dilution medium in a 96-well plate and incubated in a carbon dioxide incubator for 7 days. The 50% Tissue Culture Infectious Dose per milliliter was determined. RESULTS: Two rinses, one oral spray and one fluoride toothpaste showed log reduction of severe acute respiratory syndrome coronavirus-2 ranging from 1.81 to 2.98 and of influenza A from 2.58 to 4.13, respectively, within 30 s of contact time; similar results were obtained at 60 s. Further, the Ultra Sensitive rinse showed 0.19, 0.75, 1.58, 1.75, 2.66, and 3.24 log reduction of severe acute respiratory syndrome coronavirus, human coronavirus 229E, rhinovirus type 14, adenovirus type 5, and herpes simplex virus type 1 and type 2, respectively, within 30 s of contact time. CONCLUSION: Stabilized chlorine dioxide containing CloSYS® oral care products reduced the viral load of multiple viruses within 30 s. The results warrant further investigation for potential in vivo applications.

Uses of chlorine dioxide as prevention and treatment of COVID-19 from the user's perception

Introduction: chlorine dioxide was used as prevention and treatment of COVID-19, in pandemic times, however, there is still no evidence-based medicine to support its benefit. Aim: to describe the perceptions of patients with COVID-19 about chlorine dioxide consumption. Method: a qualitative methodology was used for a deep and experiential approach on the subject in 15 adults belonging to the Huachi Loreto parish of the Ambato canton, in Ecuador, the interviewees are between 30 and 45 years old, with an average of 38,9 years, being 60 % adult men while the remaining 40 % are adult women. Results: the results show that chlorine dioxide was used for both treatment and prevention of COVID-19, what motivated its use was the lack of knowledge of the disease and its high mortality at the beginning of the pandemic, in addition to the influence of people close to the population under study and finally the effect of chlorine dioxide was only positive. Conclusions: all persons who used chlorine dioxide either as treatment or prevention for COVID-19, for multiple reasons, reported no unfavorable effects, however, WHO, PAHO and the Ministry of Health of Ecuador prohibit its use as it lacks evidence-based medicine to justify its effectiveness. © Este es un artículo en acceso abierto.

Use of Ivermectin and Chlorine Dioxide for COVID-19 Treatment and Prophylaxis in Peru: A Narrative Review.

The spread of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), the virus that causes COVID-19, created a rapidly unfolding health crisis, especially in the initial phases of the pandemic. In the early stages of the pandemic, various strategies were proposed for COVID-19 prophylaxis and treatment with very little scientific evidence available. Among these proposed treatments were ivermectin and chlorine dioxide, which were both used widely in Peru for both disease prevention and treatment without considering their problematic side effects. For instance, ivermectin was part of an approved therapeutic scheme based on in vitro data, although its efficacy in humans was not demonstrated. In addition, chlorine dioxide was never shown to be effective but causes threatening side effects. In this article, we discuss current information regarding chlorine dioxide and ivermectin in the context of the COVID-19 pandemic, with a focus on experiences in Peru.

Can nasal irrigation with chlorine dioxide be considered as a potential alternative therapy for respiratory infectious diseases? The example of COVID-19.

Chlorine dioxide (ClO2) is a high-level disinfectant that is safe and widely used for sterilization. Due to the limitations on preparing a stable solution, direct use of ClO2 in the human body is limited. Nasal irrigation is an alternative therapy used to treat respiratory infectious diseases. This study briefly summarizes the available evidence regarding the safety/efficacy of directly using ClO2 on the human body as well as the approach of nasal irrigation to treat COVID-19. Based on the available information, as well as a preliminary experiment that comprehensively evaluated the efficacy and safety of ClO2, 25-50 ppm was deemed to be an appropriate concentration of ClO2 for nasal irrigation to treat COVID-19. This finding requires further verification. Nasal irrigation with ClO2 can be considered as a potential alternative therapy to treat respiratory infectious diseases, and COVID-19 in particular.

Viability of SARS-CoV-2 on lettuce, chicken, and salmon and its inactivation by peracetic acid, ethanol, and chlorine dioxide.

Since the first SARS-CoV-2 outbreak in Wuhan, China, there has been continued concern over the link between SARS-CoV-2 transmission and food. However, there are few studies on the viability and removal of SARS-CoV-2 contaminating food. This study aimed to evaluate the viability of SARS-CoV-2 on food matrices, depending on storage temperature, and inactivate the virus contaminating food using disinfectants. Two SARS-CoV-2 strains (L and S types) were used to contaminate lettuce, chicken, and salmon, which were then stored at 20,4 and -40 °C. The half-life of SARS-CoV-2 at 20 °C was 3-7 h but increased to 24-46 h at 4 °C and exceeded 100 h at -40 °C. SARS-CoV-2 persisted longer on chicken or salmon than on lettuce. Treatment with 70% ethanol for 1 min inactivated 3.25 log reduction of SARS-CoV-2 inoculated on lettuce but not on chicken and salmon. ClO2 inactivated up to 2 log reduction of SARS-CoV-2 on foods. Peracetic acid was able to eliminate SARS-CoV-2 from all foods. The virucidal effect of all disinfectants used in this study did not differ between the two SARS-CoV-2 strains; therefore, they could also be effective against other SARS-CoV-2 variants. This study demonstrated that the viability of SARS-CoV-2 can be extended at 4 and -40 °C and peracetic acid can inactivate SARS-CoV-2 on food matrices.

Toxic hepatitis as manifestation of intoxication due to chlorine dioxide as prophylactic use against infection due to virus SARS-CoV-2.

BACKGROUND: In the framework of the COVID-19 pandemic, some miracle products have emerged as part of the disease therapy, one of them has been chlorine dioxide and its derivatives. The Pan American Health Organization (PAHO), the European Medicines Agency (AEM) and the US Food and Drug Administration (FDA) have prepared and issued statements warning about the lack of scientific evidence in relation to its efficacy in disease caused by SARS-CoV-2 and on risks to human health. CLINICAL CASE: A 62-year-old female, with a previous history of jaundice not studied. She presented a 3-week evolution with mesogastric colic pain and generalized jaundice, associated with the ingestion of chlorine dioxide during the 3 previous months. Liver function tests: TGO: 2316 U/L, TGP: 1449 U/L, FA: 531.2 U/L, BBT: 10.41 mg/dL, BBD: 7.14 mg/dL, BBI: 3.27 mg/dL;liver ultrasound reported degenerative liver disease. Liver biopsy was compatible with toxic "drug" hepatitis. CONCLUSIONS: Chlorine dioxide belongs to a list of products that have been promoted without scientific support as prophylactic or therapeutic agents for the management of SARS-CoV-2 disease;however, the absence of evidence on its usefulness and the development of adverse effects, such as liver toxicity, have been documented in this and other publications;thus, it is recommended to avoid its administration. (English) [ FROM AUTHOR] ANTECEDENTES: En el marco de la pandemia por COVID-19 algunos productos milagro han salido a flote como parte de la terapéutica de la enfermedad, uno de ellos ha sido el dióxido de cloro y sus derivados. La Organización Panamericana de la Salud (OPS), la Agencia Europea de Medicamentos (AEM) y la Dirección de Alimentos y Fármacos de Estados Unidos (FDA) han elaborado y emitido comunicados alertando sobre la falta de evidencia científica en relación con su eficacia en la enfermedad causada por el SARS-CoV-2 y sobre los riesgos para la salud humana. CASO CLÍNICO: Paciente femenina de 62 años, quien manifestó un cuadro de tres semanas de evolución con dolor tipo cólico mesogástrico e ictericia generalizada, asociado con la ingesta de dióxido de cloro durante los tres meses previos. Las pruebas de función hepática revelaron: AST: 2316 U/L, ALT: 1449 U/L, FA: 531.2 U/L, BBT: 25.41 mg/dL, BBD: 14.42 mg/dL, BBI: 10.91 mg/dL;el ultrasonido de hígado reportó hepatopatía degenerativa. La biopsia hepática tuvo reporte anatomopatológico compatible con hepatitis tóxica "medicamentosa". CONCLUSIONES: El dióxido de cloro pertenece a una lista de productos que se han promovido sin sustento científico como agentes profilácticos o terapéuticos para el manejo de la enfermedad por SARS-CoV-2;sin embargo, se ha documentado en ésta y otras publicaciones la ausencia de pruebas de su utilidad y la aparición de efectos adversos, como toxicidad hepática;por lo que se recomienda evitar su administración. (Spanish) [ FROM AUTHOR] Copyright of Medicina Interna de Mexico is the property of Colegio de Medicina Interna de Mexico and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full . (Copyright applies to all s.)

Development and evaluation of a fluidic facemask for airborne transmission mitigation.

Recently, a fluidic facemask concept was proposed to mitigate the transmission of virus-laden aerosol and droplet infections, such as SARS-CoV-2 (COVID-19). This paper describes an experimental investigation of the first practical fluidic facemask prototype, or "Air-Screen". It employs a small, high-aspect-ratio, crossflow fan mounted on the visor of a filter-covered cap to produce a rectangular air jet, or screen, in front of the wearer's face. The entire assembly weighs less than 200 g. Qualitative flow visualization experiments using a mannequin clearly illustrated the Air-Screen's ability to effectively block airborne droplets (∼100 µm) from the wearer's face. Quantitative experiments to simulate droplets produced during sneezing or a wet cough (∼102 µm) were propelled (via a transmitter) at an average velocity of 50 m/s at 1 m from the mannequin or a target. The Air-Screen blocked 62% of all droplets with a diameter of less than 150 µm. With an Air-Screen active on the transmitter, 99% of all droplets were blocked. When both mannequin and transmitter Air-Screens were active, 99.8% of all droplets were blocked. A mathematical model, based on a weakly-advected jet in a crossflow, was employed to gain greater insight into the experimental results. This investigation highlighted the remarkable blocking effect of the Air-Screen and serves as a basis for a more detailed and comprehensive experimental evaluation.

Effectiveness of a Water Disinfection Method Based on Osmosis and Chlorine Dioxide for the Prevention of Microbial Contamination in Dental Practices.

In dental clinics, the infections may be acquired through contaminated devices, air, and water. Aerosolized water may contain bacteria, grown into the biofilm of dental unit waterlines (DUWLs). We evaluated a disinfection method based on water osmosis and chlorination with chlorine dioxide (O-CD), applied to DUWL of five dental clinics. Municipal water was chlorinated with O-CD device before feeding all DUWLs. Samplings were performed on water/air samples in order to research total microbial counts at 22-37 °C, Pseudomonas aeruginosa, Legionella spp., and chlorine values. Water was collected from the taps, spittoons, and air/water syringes. Air was sampled before, during, and after 15 min of aerosolizing procedure. Legionella and P. aeruginosa resulted as absent in all water samples, which presented total microbial counts almost always at 0 CFU/mL. Mean values of total chlorine ranged from 0.18-0.23 mg/L. Air samples resulted as free from Legionella spp. and Pseudomonas aeruginosa. Total microbial counts decreased from the pre-aerosolizing (mean 2.1 × 102 CFU/m3) to the post-aerosolizing samples (mean 1.5 × 10 CFU/m3), while chlorine values increased from 0 to 0.06 mg/L. O-CD resulted as effective against the biofilm formation in DUWLs. The presence of residual activity of chlorine dioxide also allowed the bacteria reduction from air, at least at one meter from the aerosolizing source.

Disinfectants against SARS-CoV-2: A Review.

The pandemic due to Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) has emerged as a serious global public health issue. Besides the high transmission rate from individual to individual, indirect transmission from inanimate objects or surfaces poses a more significant threat. Since the start of the outbreak, the importance of respiratory protection, social distancing, and chemical disinfection to prevent the spread of the virus has been the prime focus for infection control. Health regulatory organizations have produced guidelines for the formulation and application of chemical disinfectants to manufacturing industries and the public. On the other hand, extensive literature on the virucidal efficacy testing of microbicides for SARS-CoV-2 has been published over the past year and a half. This review summarizes the studies on the most common chemical disinfectants and their virucidal efficacy against SARS-CoV-2, including the type and concentration of the chemical disinfectant, the formulation, the presence of excipients, the exposure time, and other critical factors that determine the effectiveness of chemical disinfectants. In this review, we also critically appraise these disinfectants and conduct a discussion on the role they can play in the COVID-19 pandemic.

SELF-MEDICATION FOR PREVENTION OF COVID-19 IN UNIVERSITY STUDENTS OF THE NORTHEAST OF MEXICO

The COVID-19 pandemic has provoked an enormous impact around the world. The objective of this study was to determine the prevalence of self-medication for the prevention of COVID-19 during 2020 in a sample of university students from the northeast of Mexico. An electronic survey composed of two sections was used;the first section collects sociodemographic information, and the second section information related to self-medication for prevention of COVID-19. A total of 284 students responded to the survey, 26% reports having self-medicated to prevent COVID-19, and 34.5% reports having a family member that self-medicated to prevent COVID-19 infection. The main products used to prevent infection were vitamins, NSAIDs, and herbal products. It is concluded that, in 2021, a significant percentage of university students in north-eastern Mexico reported self-medication to prevent COVID-19 infection.

Inactivation methods for human coronavirus 229E on various food-contact surfaces and foods.

Severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2), the cause of the COVID-19 outbreaks, is transmitted by respiratory droplets and has become a life-threatening viral pandemic worldwide. The aim of this study was to evaluate the effects of different chemical (chlorine dioxide [ClO2] and peroxyacetic acid [PAA]) and physical (ultraviolet [UV]-C irradiation) inactivation methods on various food-contact surfaces (stainless steel [SS] and polypropylene [PP]) and foods (lettuce, chicken breast, and salmon) contaminated with human coronavirus 229E (HCoV-229E). Treatments with the maximum concentration of ClO2 (500 ppm) and PAA (200 ppm) for 5 min achieved >99.9% inactivation on SS and PP. At 200 ppm ClO2 for 1 min on lettuce, chicken breast, and salmon, the HCoV-229E titers were 1.19, 3.54, and 3.97 log10 TCID50/mL, respectively. Exposure (5 min) to 80 ppm PAA achieved 1.68 log10 reduction on lettuce, and 2.03 and 1.43 log10 reductions on chicken breast and salmon, respectively, treated with 1500 ppm PAA. In the carrier tests, HCoV-229E titers on food-contact surfaces were significantly decreased (p < 0.05) with increased doses of UV-C (0-60 mJ/cm2) and not detected at the maximum UV-C dose (Detection limit: 1.0 log10 TCID50/coupon). The UV-C dose of 900 mJ/cm2 proved more effective on chicken breast (>2 log10 reduction) than on lettuce and salmon (>1 log10 reduction). However, there were no quality changes (p > 0.05) in food samples after inactivation treatments except the maximum PAA concentration (5 min) and the UV-C dose (1800 mJ/cm2).

Significance of chlorine-dioxide-based oral rinses in preventing SARS-CoV-2 cell entry.

OBJECTIVE: This work aims to determine the efficacy of preprocedural oral rinsing with chlorine dioxide solutions to minimize the risk of coronavirus disease 2019 (COVID-19) transmission during high-risk dental procedures. METHODS: The antiviral activity of chlorine-dioxide-based oral rinse (OR) solutions was tested by pre-incubating with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) pseudovirus in a dosage-dependent manner before transducing to human embryonic kidney epithelial (HEK293T-ACE2) cells, which stably expresses ACE-2 receptor. Viral entry was determined by measuring luciferase activity using a luminescence microplate reader. In the cell-to-cell fusion assay, effector Chinese hamster ovary (CHO-K1) cells co-expressing spike glycoprotein of SARS-CoV-2 and T7 RNA polymerase were pre-incubated with the ORs before co-culturing with the target CHO-K1 cells co-expressing human ACE2 receptor and luciferase gene. The luciferase signal was quantified 24 h after mixing the cells. Surface expression of SARS-CoV-2 spike glycoprotein and ACE-2 receptor was confirmed using direct fluorescent imaging and quantitative cell-ELISA. Finally, dosage-dependent cytotoxic effects of ORs were evaluated at two different time points. RESULTS: A dosage-dependent antiviral effect of the ORs was observed against SARS-CoV-2 cell entry and spike glycoprotein mediated cell-to-cell fusion. This demonstrates that ORs can be useful as a preprocedural step to reduce viral infectivity. CONCLUSIONS: Chlorine-dioxide-based ORs have a potential benefit for reducing SARS-CoV-2 entry and spread.

Trends of Internet search about chlorine dioxide in eight Latin American countries during the COVID-19 pandemic

Infodemiology and infovigilance are computer methods for the analysis and monitoring of Internet data, and allow awareness of situations and creation of health policies. This study aimed to analyze the search trends for chlorine dioxide and equivalent terms on the Internet (chlorine dioxide solution, CDS;miracle mineral solution, MMS), in relation to COVID-19 morbidity and mortality in eight Latin American countries. Google Trends was used for this purpose;the period reviewed was from March 1st to November 25th 2020. The 7-day moving average for relative search volume (VRB), morbidity and mortality rate were calculated. For the association of quantitative variables, the Spearman correlation coefficient was used with a significance level p < 0.05. The country with the highest search interest was Bolivia;the one with the least interest, Brazil. The analysis of the VRB with the morbidity and mortality rate was different between countries. The maximum VRB peaks of Colombia and Chile, in April, and of Mexico, Ecuador and Bolivia, in July, coincided with the issuance of health alerts on chlorine dioxide. Most showed a moderate and low significant correlation between VRB and the number of confirmed cases and daily deaths from COVID-19. The behavior of the searches, differentiated between countries, could indicate greater interest in the topic of chlorine dioxide during the pandemic;this would be explained by the dissemination of health alerts from international, regional and local health agencies. © 2022, Centro Nacional de Informacion de Ciencias Medicas. All rights reserved.

Misinformation About and Interest in Chlorine Dioxide During the COVID-19 Pandemic in Mexico Identified Using Google Trends Data: Infodemiology Study.

BACKGROUND: The COVID-19 pandemic has prompted the increasing popularity of several emerging therapies or preventives that lack scientific evidence or go against medical directives. One such therapy involves the consumption of chlorine dioxide, which is commonly used in the cleaning industry and is available commercially as a mineral solution. This substance has been promoted as a preventive or treatment agent for several diseases, including SARS-CoV-2 infection. As interest in chlorine dioxide has grown since the start of the pandemic, health agencies, institutions, and organizations worldwide have tried to discourage and restrict the consumption of this substance. OBJECTIVE: The aim of this study is to analyze search engine trends in Mexico to evaluate changes in public interest in chlorine dioxide since the beginning of the COVID-19 pandemic. METHODS: We retrieved public query data for the Spanish equivalent of the term "chlorine dioxide" from the Google Trends platform. The location was set to Mexico, and the time frame was from March 3, 2019, to February 21, 2021. A descriptive analysis was performed. The Kruskal-Wallis and Dunn tests were used to identify significant changes in search volumes for this term between four consecutive time periods, each of 13 weeks, from March 1, 2020, to February 27, 2021. RESULTS: From the start of the pandemic in Mexico (February 2020), an upward trend was observed in the number of searches compared with that in 2019. Maximum volume trends were recorded during the week of July 19-25, 2020. The search volumes declined between September and November 2020, but another peak was registered in December 2020 through February 2021, which reached a maximum value on January 10. Percentage change from the first to the fourth time periods was +312.85, -71.35, and +228.18, respectively. Pairwise comparisons using the Kruskal-Wallis and Dunn tests showed significant differences between the four periods (P<.001). CONCLUSIONS: Misinformation is a public health risk because it can lower compliance with the recommended measures and encourage the use of therapies that have not been proven safe. The ingestion of chlorine dioxide presents a danger to the population, and several adverse reactions have been reported. Programs should be implemented to direct those interested in this substance to accurate medical information.

Characteristics and factors associated with self-medication due to COVID-19 in students of a Peruvian University

Introduction: The university population may be vulnerable to self-medication due to COVID-19 due to their greater exposure to social networks and their tendency to imitate self-medication practices of their social environment. Objective: Assess the characteristics and factors associated with self-medication due to COVID-19 in undergraduate university students of a Peruvian university. Methods: An analytical cross-sectional study (October 1st to November 14, 2020) in which 166 surveys were analyzed among students of the National University of Central Peru selected through a probabilistic sampling stratified by faculties. The factors associated with self-medication were evaluated by Poisson regression of robust variances, in this way the prevalence ratios and corresponding confidence intervals were obtained. Results: 14.5% of the students self-medicated due to COVID-19 and the main reasons were sore throat (45.8%), fever (37.5%) and disease prevention (29.2%). The most commonly used drugs were paracetamol (70.8%), aspirin (62.5%) and influenza drugs (62.5%). Some participants (20.8%) reported experiencing side effects after taking medications such as aspirin, ivermectin, dexamethasone, and chlorine dioxide. The perception that self-medication is harmful to health (PR: 0.41;CI: 0.20-0.84) and having doctors as a source of drug information (PR: 0.46;CI: 0.21-0.99) were associated with self-medication due to COVID-19. Approximately 15 out of every 100 students in the studied population self-medicated due to COVID-19. Likewise, those who perceived self-medication as harmful to health and who had doctors as a source of drug information self-medicated less. Conclusions: The results allow us to characterize the problem of self-medication due to COVID-19 in university students, while offering information for the approach of strategies that reduce its negative impact.

A systematic review on chlorine dioxide as a disinfectant.

The COVID-19 pandemic has tremendously increased the production and sales of disinfectants. This study aimed to systematically review and analyze the efficacy and safety of chlorine dioxide as a disinfectant. The literature relating to the use of chlorine dioxide as a disinfectant was systematically reviewed in January 2021 using databases such as PubMed, Science Direct, and Google Scholar. Inclusion criteria were studies that investigated the use of chlorine dioxide to assess the efficacy, safety, and impact of chlorine dioxide as a disinfectant. Out of the 33 included studies, 14 studies focused on the disinfectant efficacy of chlorine dioxide, 8 studies expounded on the safety and toxicity in humans and animals, and 15 studies discussed the impact, such as water treatment disinfection using chlorine dioxide. Chlorine dioxide is a safe and effective disinfectant, even at concentrations as low as 20 to 30 mg/L. Moreover, the efficacy of chlorine dioxide is mostly independent of pH. Chlorine dioxide can be effectively used to disinfect drinking water without much alteration of palatability and can also be used to destroy pathogenic microbes, including viruses, bacteria, and fungi from vegetables and fruits. Our review confirms that chlorine dioxide is effective against the resistant Mycobacterium, H1N1, and other influenza viruses. Studies generally support the use of chlorine dioxide as a disinfectant. The concentration deemed safe for usage still needs to be determined on a case-by-case basis.

Respiratory Safety Evaluation in Mice and Inhibition of Adenoviral Amplification in Human Bronchial Endothelial Cells Using a Novel Type of Chlorine Dioxide Gas Reactor.

Since the onset of the COVID-19 pandemic, there has been a growing demand for effective and safe disinfectants. A novel use of chlorine dioxide (ClO2) gas, which can satisfy such demand, has been reported. However, its efficacy and safety remain unclear. For the safe use of this gas, the stable release of specific concentrations is a must. A new type of ClO2 generator called Dr.CLOTM has recently been introduced. This study aimed to investigate: (1) the effects of Dr.CLOTM on inhibiting adenoviral amplification on human bronchial epithelial (HBE) cells; and (2) the acute inhalation safety of using Dr.CLOTM in animal models. After infecting HBE cells with a recombinant adenovirus, the inhibitory power of Dr.CLOTM on the virus was expressed as IFU/mL in comparison with the control group. The safety of ClO2 gas was indirectly predicted using mice by measuring single-dose inhalation toxicity in specially designed chambers. Dr.CLOTM was found to evaporate in a very constant concentration range at 0-0.011 ppm/m3 for 42 days. In addition, 36-100% of adenoviral amplification was suppressed by Dr.CLOTM, depending on the conditions. The LC50 of ClO2 gas to mice was approximately 68 ppm for males and 141 ppm for females. Histopathological evaluation showed that the lungs of female mice were more resistant to the toxicity from higher ClO2 gas concentrations than those of male mice. Taken together, these results indicate that Dr.CLOTM can be used to provide a safe indoor environment due to its technology that maintains the stable concentration and release of ClO2 gas, which could suppress viral amplification and may prevent viral infections.

FACTORS RELATED TO NEW ONSET DYSPEPSIA AFTER COVID 19 INFECTION IN MEXICAN POPULATION

ntroduction: Since the COVID 19 infection has been declared a pandemic by the World Health Organization, the spectrum of symptoms have been described, however, the presence of digestive symptoms as part of the probable sequelae of the disease has not been well studied. Objective: To determine the variables present during the active stage period of the COVID 19 infection and their association with symptoms of dyspepsia during the recovery period. Material and methods: An online survey was conducted to patients recovered from COVID 19 infection during the months of May and June 2020, evaluating the demographic variables of age, sex and comorbidities, the presence of COVID 19 infection symptoms during the disease active stage and digestive symptoms during recovery. Using SPSS version 22, univar-iate and multivariate logistic regression analysis was performed to determine the variables associated with the presence of dyspeptic symptoms such as early satiety, epigastric pain and postprandial fullness during recovery from the disease (4 weeks after the infection resolved). Results: A total of 315 patients recovered from COVID 19 infection were evaluated, mainly 59.6% from Baja California, 12.2% from Sonora, 7.8% CDMX, 6% Sinaloa, 3% Veracruz with an average age of 35.7 ±11.5 years of age, 65.4% female, with obesity comorbidities in 19.6% of cases, high blood pressure in 10.9%, asthma in 7.1% and diabetes mellitus in 2.2%. The most frequent symptoms reported of the disease were headache 79.5 %, myalgias 64.1%, diarrhea 60.9%, anosmia 62.2%, fever 57.1%, ageusia 58.7%, odynophagia 56.1%, arthralgias 54.7%, anorexia 52.6%, cough 49.7%, chest pain 39.4%, dyspnea 28.5%. Dyspep-sia in the recovery period was reported with pain in 18.6%, postprandial fullness 34.3%and early satiety in 52.2%. It was found that the variables independently associated with the presence of postprandial fullness during recovery from the disease are male (OR 0.544,IC 0.309-0.958, P = 0.035), anorexia (OR 3.07, IC 1.73-5.45, P <.001) and diarrhea (OR 1.87. IC 1.04-3.34, P = 0.034). The variable associated with the presence of satiety during recovery from the disease is the presence of anorexia (OR 6.65, CI 3.75-11.79, P <0.001). The presence of epigastric pain after COVID 19 infection is associated with diarrhea (OR 3.32, IC 1.42-7.79, P = 0.006), arthralgia (OR 3.15, IC 3.15-1.16-8.55, P = 0.026), treatment with azithromycin ( OR 2.29, IC 1.13-4.64, P = 0.021), chlorine dioxide treatment (OR 11.35, IC 2.69-47.9, P = 0.001).Conclusions: The presence of dyspepsia after infection by COVID 19 is frequent, some of the associated variables are similar to those reported in other cases of post-infectious dyspep-sia, the use of medications has an important relationship with the presence of epigastric pain.