scholarly journals Insight on the evaporation dynamics in reducing the COVID-19 infection triggered by respiratory droplets

2021 ◽  
Vol 33 (7) ◽  
pp. 072004
Author(s):  
Sumit Kumar
Keyword(s):  
Evaporation Dynamics ◽  
Respiratory Droplets

scholarly journals Two-dimensional mathematical framework for evaporation dynamics of respiratory droplets

2021 ◽  
Vol 33 (10) ◽  
pp. 103302
Author(s):  
Sreeparna Majee ◽  
Abhishek Saha ◽  
Swetaprovo Chaudhuri ◽  
Dipshikha Chakravortty ◽  
Saptarshi Basu
Keyword(s):  
Mathematical Framework ◽  
Two Dimensional ◽  
Evaporation Dynamics ◽  
Respiratory Droplets

Coronavirus diseases and pregnancy: COVID-19,SARS, and MERS

2020 ◽  
pp. 276-289
Author(s):  
Mobina Fathi ◽  
Kimia Vakili ◽  
Niloofar Deravi
Keyword(s):  
Pregnant Women ◽  
Intrauterine Growth Retardation ◽  
Negative Impact ◽  
World Health ◽  
Wuhan City ◽  
Intrauterine Growth ◽  
Exponential Increase ◽  
The World ◽  
Health Organization ◽  
Respiratory Droplets

Around the end of December 2019, a new beta-coronavirus from Wuhan City, Hubei Province, China began to spread rapidly. The new virus, called SARS-CoV-2, which could be transmitted through respiratory droplets, had a range of mild to severe symptoms, from simple cold in some cases to death in others. The disease caused by SARS-CoV-2 was named COVID-19 by WHO and has so far killed more people than SARS and MERS. Following the widespread global outbreak of COVID-19, with more than 132758 confirmed cases and 4955 deaths worldwide, the World Health Organization declared COVID-19 a pandemic disease in January 2020. Earlier studies on viral pneumonia epidemics has shown that pregnant women are at greater risk than others. During pregnancy, the pregnant woman is more prone to infectious diseases. Research on both SARS-CoV and MERS-CoV, which are pathologically similar to SARS-CoV-2, has shown that being infected with these viruses during pregnancy increases the risk of maternal death, stillbirth, intrauterine growth retardation and, preterm delivery. With the exponential increase in cases of COVID-19 throughout the world, there is a need to understand the effects of SARS-CoV-2 on the health of pregnant women, through extrapolation of earlier studies that have been conducted on pregnant women infected with SARS-CoV, and MERS-CoV. There is an urgent need to understand the chance of vertical transmission of SARS-CoV-2 from mother to fetus and the possibility of the virus crossing the placental barrier. Additionally, since some viral diseases and antiviral drugs may have a negative impact on the mother and fetus, in which case, pregnant women need special attention for the prevention, diagnosis, and treatment of COVID-19.

Role of Rasayan Churna in outbreak of Covid -19 as preventive and curative aspect

2020 ◽  
Vol 11 (SPL1) ◽  
pp. 1208-1212
Author(s):  
Amol Madhav Deshpande ◽  
Mayuri Amol Deshpande
Keyword(s):  
Recurrent Infection ◽  
Symptomatic Patient ◽  
H1n1 Influenza ◽  
Drug Of Choice ◽  
Asymptomatic Patients ◽  
Diseased Person ◽  
Anti Cancer ◽  
Anti Oxidant ◽  
Immune Booster ◽  
Respiratory Droplets

In last two decade world suffer with three epidemic diseases like SARS-CoV, H1N1 influenza, MERS –CoV and presently the world under a pandemic of Covid-19, out of these SARS-CoV, MERS –CoV and Covid-19 are form the same virus call as corona, which primary present on bats and transferred from animal to human, and then it transfer from human to human mostly by respiratory droplets or in the direct contact with the diseased person, these recurrent infection of corona virus is the burning issue in the word, so to avoid these recurrent infections good habitual behaviour with regular immune booster medicine should be taken which can be used in both normal and symptomatic patient for this Rasayan churna  is the best drug of choice as it is used for  rejuvenation therapy. From literally study from various recourses it is found that Rasayan churna have property anti-depressant, anti-xylotic, Immunomodulatory, Anti-diabetes, anti hypertensive, anti-inflammatory, Anti-toxic effects, Anti-arthritic, Anti-cancer effects, Anti-microbial effect, and Anti-oxidant which can be useful in preventive aspect of Covid -19 in all phase like normal individual, also can be used in asymptomatic patients and symptomatic patients, clinical study can be performed for the same to evaluate the result.

Outbreak of coronavirus disease 2019 (COVID-19) and its manifestation

Coronaviruses ◽  
2020 ◽  
Vol 01 ◽  
Author(s):  
Bikash Debnath ◽  
Waikhom Somraj Singh ◽  
Kuntal Manna
Keyword(s):  
Antiviral Drug ◽  
World Health ◽  
Family Welfare ◽  
Pregnant Mother ◽  
Vaccine Candidates ◽  
The World ◽  
Mode Of Transmission ◽  
Health Organization ◽  
Effective Drugs ◽  
Respiratory Droplets

: The coronavirus disease 2019 (COVID-19) first outbreak in Wuhan, China, and the infection is intense worldwide. Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is responsible for COVID-19. The World Health Organization (WHO) confirmed total deaths had noted 4.20% globally (March 21, 2020). Between the intervals of four months (July 21, 2020), confirmed total deaths had recorded 4.17%, globally. In India, 909 confirmed cases and 19 deaths were reported by Health and Family Welfare, Government of India, March 28, 2020. Between the intervals of 123 days In India, 1638870 confirmed cases and 35684 deaths. COVID-19 can potentially spread from person to person through direct contact or respiratory droplets from coughing and sneezing. The most common symptoms are fever, dry cough, difficulty in breathing, and fatigue. A pregnant mother with COVID-19 has fewer chances to transfer this infection of her newborn babies. Children have less affected than an adult. A specific antiviral drug or vaccine has not been developed to cure the disease. Chloroquine, hydroxychloroquine, lopinavir, ritonavir, nafamostat, nitazoxanide, and remdesivir have effective drugs to treat COVID-19. Many vaccine candidates are under pre-clinical and clinical studies. In this review, we highlight the epidemiology, sign-symptoms, pathogenesis, mode of transmission, and effects of a pregnant mother with newborns, children, prevention, and drugs affective to COVID-19.

scholarly journals Epicutaneous immunization with modified vaccinia Ankara viral vectors generates superior T cell immunity against a respiratory viral challenge

npj Vaccines ◽  
2021 ◽  
Vol 6 (1) ◽  
Author(s):  
Youdong Pan ◽  
Luzheng Liu ◽  
Tian Tian ◽  
Jingxia Zhao ◽  
Chang Ook Park ◽  
...  
Keyword(s):  
T Cells ◽  
Viral Vectors ◽  
Effector T Cells ◽  
T Cell Immunity ◽  
Smallpox Vaccine ◽  
Respiratory Pathogens ◽  
Cell Immunity ◽  
Respiratory Challenge ◽  
Respiratory Droplets ◽  
Route Of Delivery

AbstractModified Vaccinia Ankara (MVA) was recently approved as a smallpox vaccine. Variola is transmitted by respiratory droplets and MVA immunization by skin scarification (s.s.) protected mice far more effectively against lethal respiratory challenge with vaccinia virus (VACV) than any other route of delivery, and at lower doses. Comparisons of s.s. with intradermal, subcutaneous, or intramuscular routes showed that MVAOVA s.s.-generated T cells were both more abundant and transcriptionally unique. MVAOVA s.s. produced greater numbers of lung Ova-specific CD8+ TRM and was superior in protecting mice against lethal VACVOVA respiratory challenge. Nearly as many lung TRM were generated with MVAOVA s.s. immunization compared to intra-tracheal immunization with MVAOVA and both routes vaccination protected mice against lethal pulmonary challenge with VACVOVA. Strikingly, MVAOVA s.s.-generated effector T cells exhibited overlapping gene transcriptional profiles to those generated via intra-tracheal immunization. Overall, our data suggest that heterologous MVA vectors immunized via s.s. are uniquely well-suited as vaccine vectors for respiratory pathogens, which may be relevant to COVID-19. In addition, MVA delivered via s.s. could represent a more effective dose-sparing smallpox vaccine.

scholarly journals Potential Prophylactic Treatments for COVID-19

Viruses ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1292
Author(s):  
Noam Ben-Zuk ◽  
Ido-David Dechtman ◽  
Itai Henn ◽  
Libby Weiss ◽  
Amichay Afriat ◽  
...  
Keyword(s):  
World Health ◽  
Pharmaceutical Drugs ◽  
Mild Disease ◽  
Clinical Background ◽  
Repurposed Drugs ◽  
Prophylactic Use ◽  
Health Organization ◽  
Medical Indications ◽  
Respiratory Droplets ◽  
Near Future

The World Health Organization declared the SARS-CoV-2 outbreak a Public Health Emergency of International Concern at the end of January 2020 and a pandemic two months later. The virus primarily spreads between humans via respiratory droplets, and is the causative agent of Coronavirus Disease 2019 (COVID-19), which can vary in severity, from asymptomatic or mild disease (the vast majority of the cases) to respiratory failure, multi-organ failure, and death. Recently, several vaccines were approved for emergency use against SARS-CoV-2. However, their worldwide availability is acutely limited, and therefore, SARS-CoV-2 is still expected to cause significant morbidity and mortality in the upcoming year. Hence, additional countermeasures are needed, particularly pharmaceutical drugs that are widely accessible, safe, scalable, and affordable. In this comprehensive review, we target the prophylactic arena, focusing on small-molecule candidates. In order to consolidate a potential list of such medications, which were categorized as either antivirals, repurposed drugs, or miscellaneous, a thorough screening for relevant clinical trials was conducted. A brief molecular and/or clinical background is provided for each potential drug, rationalizing its prophylactic use as an antiviral or inflammatory modulator. Drug safety profiles are discussed, and current medical indications and research status regarding their relevance to COVID-19 are shortly reviewed. In the near future, a significant body of information regarding the effectiveness of drugs being clinically studied for COVID-19 is expected to accumulate, in addition to information regarding the efficacy of prophylactic treatments.

scholarly journals Disinfection of SARS-CoV-2 Contaminated Surfaces of Personal Items with UVC-LED Disinfection Boxes

Viruses ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 598
Author(s):  
Maren Bormann ◽  
Mira Alt ◽  
Leonie Schipper ◽  
Lukas van de Sand ◽  
Mona Otte ◽  
...  
Keyword(s):  
Severe Acute Respiratory Syndrome ◽  
Close Contact ◽  
Credit Cards ◽  
Organic Matrix ◽  
Viral Loads ◽  
Small Aerosol ◽  
Time Periods ◽  
Respiratory Droplets ◽  
Glass Metal

The severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) is transmitted from person to person by close contact, small aerosol respiratory droplets, and potentially via contact with contaminated surfaces. Herein, we investigated the effectiveness of commercial UVC-LED disinfection boxes in inactivating SARS-CoV-2-contaminated surfaces of personal items. We contaminated glass, metal, and plastic samples representing the surfaces of personal items such as smartphones, coins, or credit cards with SARS-CoV-2 formulated in an organic matrix mimicking human respiratory secretions. For disinfection, the samples were placed at different distances from UVC emitting LEDs inside commercial UVC-LED disinfection boxes and irradiated for different time periods (up to 10 min). High viral loads of SARS-CoV-2 were effectively inactivated on all surfaces after 3 min of irradiation. Even 10 s of UVC-exposure strongly reduced viral loads. Thus, UVC-LED boxes proved to be an effective method for disinfecting SARS-CoV-2-contaminated surfaces that are typically found on personal items.

scholarly journals Questioning COVID-19 Surface Stability and Fomite Spreading in Three Aeromedical Cases: A Case Series

2020 ◽  
Author(s):  
Sean Horoho ◽  
Stephen Musik ◽  
David Bryant ◽  
William Brooks ◽  
Ian M Porter
Keyword(s):  
Severe Acute Respiratory Syndrome ◽  
Close Contact ◽  
Small Sample Size ◽  
Case Series ◽  
Small Sample ◽  
Posture Analysis ◽  
Surface Stability ◽  
Single Positive ◽  
Means Of Transmission ◽  
Respiratory Droplets

ABSTRACT It is well established that coronavirus disease 2019 is primarily transmitted through respiratory droplets, and there is mounting research speculation that it may also be transmitted via fomites. Several studies have shown that the virus can persist on both porous and nonporous surfaces for hours to days, depending upon the material. This article examines three cases of polymerase chain reaction–proven severe acute respiratory syndrome coronavirus 2 infection with several additional individuals meeting CDC close contact criteria. In 1 case, 195 downstream contacts were all tested to prevent a mass outbreak in a deployment posture. Analysis of these contacts yielded only a single positive test, which could be reasonably ascribed to respiratory droplet transmission. While these cases and their contacts ultimately represent a small sample size, we suggest fomite spread may not be a significant means of transmission for severe acute respiratory syndrome coronavirus 2 in real-world operational scenarios.

scholarly journals SARS-CoV-2-associated gastrointestinal and liver diseases: what is known and what is needed to explore

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Dina Sweed ◽  
Eman Abdelsameea ◽  
Esraa A. Khalifa ◽  
Heba Abdallah ◽  
Heba Moaz ◽  
...  
Keyword(s):  
English Language ◽  
Data Extraction ◽  
Oral Route ◽  
Main Body ◽  
Disease Manifestation ◽  
Gi Symptoms ◽  
Septic Focus ◽  
Pubmed Search ◽  
Risk Patients ◽  
Respiratory Droplets

Abstract Background The pandemic of COVID19 which is caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) was first described in China as an unexplained pneumonia transmitted by respiratory droplets. Gastrointestinal (GI) and liver injury associated with SARS-CoV-2 infection were reported as an early or sole disease manifestation, mainly outside China. The exact mechanism and incidence of GI and liver involvement are not well elucidated. Main body We conducted a PubMed search for all articles written in the English language about SARS-CoV-2 affecting the GI and liver. Following data extraction, 590 articles were selected. In addition to respiratory droplets, SARS-CoV-2 may reach the GI system through the fecal-oral route, saliva, and swallowing of nasopharyngeal fluids, while breastmilk and blood transmission were not implicated. Moreover, GI infection may act as a septic focus for viral persistence and transmission to the liver, appendix, and brain. In addition to the direct viral cytopathic effect, the mechanism of injury is multifactorial and is related to genetic and demographic variations. The most frequently reported GI symptoms are diarrhea, nausea, vomiting, abdominal pain, and bleeding. However, liver infection is generally discovered during laboratory testing or a post-mortem. Radiological imaging is the gold standard in diagnosing COVID-19 patients and contributes to understanding the mechanism of extra-thoracic involvement. Medications should be prescribed with caution, especially in chronic GI and liver patients. Conclusion GI manifestations are common in COVID-19 patients. Special care should be paid for high-risk patients, older males, and those with background liver disease.

scholarly journals Packaging Covered with Antiviral and Antibacterial Coatings Based on ZnO Nanoparticles Supplemented with Geraniol and Carvacrol

2021 ◽  
Vol 22 (4) ◽  
pp. 1717
Author(s):  
Małgorzata Mizielińska ◽  
Paweł Nawrotek ◽  
Xymena Stachurska ◽  
Magdalena Ordon ◽  
Artur Bartkowiak
Keyword(s):  
Synergistic Effect ◽  
Moderate Activity ◽  
Gram Negative Bacteria ◽  
Human Pathogen ◽  
Safety Measures ◽  
Gram Negative ◽  
Airborne Viruses ◽  
Respiratory Droplets ◽  
Active Substances ◽  
External Coating

The purpose of the study was to obtain an external coating based on nanoparticles of ZnO, carvacrol, and geraniol that could be active against viruses such as SARS-Co-V2. Additionally, the synergistic effect of the chosen substances in coatings was analyzed. The goal of the study was to measure the possible antibacterial activity of the coatings obtained. Testing antiviral activity with human pathogen viruses, such as SARS-Co-V2, requires immense safety measures. Bacteriophages such as phi 6 phage represent good surrogates for the study of airborne viruses. The results of the study indicated that the ZC1 and ZG1 coatings containing an increased amount of geraniol or carvacrol and a very small amount of nanoZnO were found to be active against Gram-positive and Gram-negative bacteria. It is also important that a synergistic effect between these active substances was noted. This explains why polyethylene (PE) films covered with the ZC1 or ZG1 coatings (as internal coatings) were found to be the best packaging materials to extend the quality and freshness of food products. The same coatings may be used as the external coatings with antiviral properties. The ZC1 and ZG1 coatings showed moderate activity against the phi 6 phage that has been selected as a surrogate for viruses such as coronaviruses. It can be assumed that coatings ZG1 and ZC1 will also be active against SARS-CoV-2 that is transmitted via respiratory droplets.

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