Spread Of Virus Research Articles

Diet-induced obesity affects influenza disease severity and transmission dynamics in ferrets.

Obesity, and the associated metabolic syndrome, is a risk factor for increased disease severity with a variety of infectious agents, including influenza virus. Yet, the mechanisms are only partially understood. As the number of people, particularly children, living with obesity continues to rise, it is critical to understand the role of host status on disease pathogenesis. In these studies, we use a diet-induced obese ferret model and tools to demonstrate that, like humans, obesity resulted in notable changes to the lung microenvironment, leading to increased clinical disease and viral spread to the lower respiratory tract. The decreased antiviral responses also resulted in obese animals shedding higher infectious virus for a longer period, making them more likely to transmit to contacts. These data suggest that the obese ferret model may be crucial to understanding obesity's impact on influenza disease severity and community transmission and a key tool for therapeutic and intervention development for this high-risk population.

Ecological Requirements for Abundance and Dispersion of Brazilian Yellow Fever Vectors in Tropical Areas.

In the Americas, wild yellow fever (WYF) is an infectious disease that is highly lethal for some non-human primate species and non-vaccinated people. Specifically, in the Brazilian Atlantic Forest, Haemagogus leucocelaenus and Haemagogus janthinomys mosquitoes act as the major vectors. Despite transmission risk being related to vector densities, little is known about how landscape structure affects vector abundance and movement. To fill these gaps, we used vector abundance data and a model-selection approach to assess how landscape structure affects vector abundance, aiming to identify connecting elements for virus dispersion in the state of São Paulo, Brazil. Our findings show that Hg. leucocelaenus and Hg. janthinomys abundances, in highly degraded and fragmented landscapes, are mainly affected by increases in forest cover at scales of 2.0 and 2.5 km, respectively. Fragmented landscapes provide ecological corridors for vector dispersion, which, along with high vector abundance, promotes the creation of risk areas for WYF virus spread, especially along the border with Minas Gerais state, the upper edges of the Serra do Mar, in the Serra da Cantareira, and in areas of the metropolitan regions of São Paulo and Campinas.

Evaluation of combined disinfection methods of infectious myonecrosis virus (IMNV) in seawater using Pacific white shrimp (Penaeus vannamei)

The global spread of infectious myonecrosis virus (IMNV) poses a serious threat to the shrimp aquaculture industry and urgent actions are needed to control its transmission and prevalence. Aquaculture water serves as an important route of IMN transmission, and disinfection of aquaculture water is crucial to ensure the health and stable production of shrimp. In this study, we introduced the purified IMNV into seawater and then subjected the seawater to different disinfection treatments (PMS, PMS + PVP-I and ClO2 + PVP-I) before culturing shrimp. By performing RT-qPCR tests on both the seawater and Pacific white shrimp (Penaeus vannamei) samples, we evaluated the effectiveness of the different disinfection methods in eradicating IMNV from the seawater. The results showed that peroxymonosulfate (PMS) could effectively reduce the viral load of IMNV in seawater samples. The combined disinfection approach (10 ppm) of PMS disinfection (combined with povidone‑iodine) followed by a standing time of at least 2 days, or 10 ppm chlorine dioxide disinfection (combined with povidone‑iodine) followed by a standing time of at least 4 days, were found to be successful in the efficient disinfection of IMNV. This research provides a method to effectively remove IMNV from marine aquaculture water, thereby contributing to reducing the risk of IMN disease transmission and providing a sound basis for the sustainable and healthy development of the shrimp aquaculture industry.

Study on SEAI Model of COVID-19 Based on Asymptomatic Infection

In this paper, an SEAI epidemic model with asymptomatic infection is studied under the background of mass transmission of COVID-19. First, we use the next-generation matrix method to obtain the basic reproductive number R0 and calculate the equilibrium point. Secondly, when R0<1, the local asymptotic stability of the disease-free equilibrium is proved by Hurwitz criterion, and the global asymptotic stability of the disease-free equilibrium is proved by constructing the Lyapunov function. When R0>1, the system has a unique endemic equilibrium point and is locally asymptotically stable, and it is also proved that the system is uniformly persistent. Then, the application of optimal control theory is carried out, and the expression of the optimal control solution is obtained. Finally, in order to verify the correctness of the theory, the stability of the equilibrium point is numerically simulated and the sensitivity of the parameters of R0 is analyzed. We also simulated the comparison of the number of asymptomatic infected people and symptomatic infected people before and after adopting the optimal control strategy. This shows that the infection of asymptomatic people cannot be underestimated in the spread of COVID-19 virus, and an isolation strategy should be adopted to control the spread speed of the disease.

Automated Detection and Counting of Wild Boar in Camera Trap Images.

Camera traps are becoming widely used for wildlife monitoring and management. However, manual analysis of the resulting image sets is labor-intensive, time-consuming and costly. This study shows that automated computer vision techniques can be extremely helpful in this regard, as they can rapidly and automatically extract valuable information from the images. Specific training with a set of 1600 images obtained from a study where wild animals approaching wild boar carcasses were monitored enabled the model to detect five different classes of animals automatically in their natural environment with a mean average precision of 98.11%, namely 'wild boar', 'fox', 'raccoon dog', 'deer' and 'bird'. In addition, sequences of images were automatically analyzed and the number of wild boar visits and respective group sizes were determined. This study may help to improve and speed up the monitoring of the potential spread of African swine fever virus in areas where wild boar are affected.

Plant virus transmission during seed development and implications to plant defense system.

Most plants produce large amounts of seeds to disperse their progeny in the environment. Plant viruses have evolved to avoid plant resistance mechanisms and use seeds for their dispersal. The presence of plant pathogenic viruses in seeds and suppression of plant host defenses is a major worldwide concern for producers and seed companies because undetected viruses in the seed can represent a significant threat to yield in many economically important crops. The vertical transmission of plant viruses occurs directly through the embryo or indirectly by getting in pollen grains or ovules. Infection of plant viruses during the early development of the seed embryo can result in morphological or genetic changes that cause poor seed quality and, more importantly, low yields due to the partial or ubiquitous presence of the virus at the earliest stages of seedling development. Understanding transmission of plant viruses and the ability to avoid plant defense mechanisms during seed embryo development will help identify primary inoculum sources, reduce virus spread, decrease severity of negative effects on plant health and productivity, and facilitate the future of plant disease management during seed development in many crops. In this article, we provide an overview of the current knowledge and understanding of plant virus transmission during seed embryo development, including the context of host-virus interaction.

Skin- and Eco-Friendly Hand Sanitizer: A Novel Composition of Natural Extracts to Prevent the Spread of Respiratory Viruses.

Respiratory diseases caused by viruses are a serious global health threat. Although the use of hand sanitizers containing alcohol and synthetic antiseptic agents is recognized as an effective, simple, and low-cost measure to combat viral transmission, they can harm human health and the environment. Thus, this work aimed to study the efficacy of combining Camellia sinensis and Chamomilla recutita extracts in a skin- and eco-friendly leave-on hand sanitizer to prevent the spread of respiratory viruses. An oil-in-water emulsion containing C. recutita oily extract (5.0%), C. recutita glycolic extract (0.2%) and C. sinensis glycolic extract (5.0%) showed virucidal activity against HAdV-2 (respiratory virus) and two surrogate viruses of SARS-CoV-2 (HSV-1 and MVH-3), showing great potential to prevent the spread of respiratory viruses. These natural extracts combined are also promising to combat a broad spectrum of other viruses, in the form of antiseptic mouthwashes or throat sprays, surface disinfectants, and veterinary products, among others. Complementally, the developed hand sanitizer demonstrated efficacy against bacteria and fungus.

Innovative Adaptations of Dance Performances at the Yogyakarta Palace during the Covid-19 Pandemic

The Covid-19 pandemic poses challenges to the world of performing arts, especially dance performances. Dance events that gather crowds were halted due to adherence to government recommendations to prevent the spread of the Covid-19 virus. Nevertheless, the Yogyakarta Palace managed to persist in showcasing their dances during the pandemic. Therefore, this article seeks to describe the response of the Yogyakarta Palace in addressing the challenges of dance performances during the pandemic. This is deemed important to provide insights into the creativity of artists in adapting the presentation of a dance during the pandemic to ensure its continued existence. This research takes the form of qualitative research with a performing arts approach predominantly based on literature studies. The Kraton Jogja YouTube account serves as the main data source to understand the innovative adaptations made by the Yogyakarta Palace. Comparative studies are employed to identify the differences in the presentation of dance before, during, and after the pandemic. The goal is to ascertain the efforts of innovative adaptation undertaken. The research indicates that innovative adaptation is carried out through creative costume design, audience engagement in dance events, and the utilization of internet technology advancements through virtual dance performances on the YouTube channel. As an adaptive effort, these creations are aligned with government regulations related to the containment of the spread of the Covid-19 virus. These innovative adaptation efforts bring about significant changes to the established ways of presenting dances at the Yogyakarta Palace.

The role of telehealth in the delivery of oral and maxillofacial surgery services at a level 6 hospital in New South Wales Australia during COVID-19 - the John Hunter Hospital experience: a commentary, review and cautionary tale for the future.

The objective of this article is to understand the uptake in use of Telehealth services during the COVID-19 pandemic as a way to provide compelling impetus for further research and promotion of Telehealth in general. A data review of Outpatient Department data from 2020 to 2023, as compiled by the Surgical Outcomes improvement Unit. Telehealth was widely adopted during the COVID-19 pandemic for clinicians to provide healthcare to patients whilst adhering to strict lockdown guidelines aimed at limiting exposure and spread of the respiratory virus. There has been minimal analysis, however, of the ethical and legal implications of telemedicine. Whilst it seems that access to care is improved via telehealth, there are subtle, inherent barriers intrinsic to it. There was a significant increase in the use of audio and audiovisual aids in the delivery of Oral and Maxillofacial Outpatient care during the COVID-19 period. Further analysis and improvements need to be made to the system before it can be considered as sufficient and adequate. Where there is rapid adoption of Telehealth in the delivery of Oral and Maxillofacial Surgery Services, there must be concurrent rigorous review and update of systems in order to address the key areas of patient safety and accuracy of treatment.

Variance of the Infection Number of Heterogeneous Malware Spread in Network

The Susceptible–Infected–Susceptible (SIS) model in complex networks is one of the critical models employed in the modeling of virus spread. The study of the heterogeneous SIS model with a non-homogeneous nodal infection rate in finite-size networks has attracted little attention. Investigating the statistical properties of heterogeneous SIS epidemic dynamics in finite networks is thus intriguing. In this paper, we focus on the measure of variability in the number of infected nodes for the heterogeneous SIS epidemic dynamics in finite-size bipartite graphs and star graphs. Specifically, we investigate the metastable-state variance of the number of infected nodes for the SIS epidemic process in finite-size bipartite graphs and star graphs with heterogeneous nodal infection rates. We employ an extended individual-based mean-field approximation to analyze the heterogeneous SIS epidemic process in finite-size bipartite networks and star graphs. We derive the approximation solutions of the variance of the infected number. We verify the proposed theory by simulations. The proposed theory has the potential to help us better understand the fluctuations of SIS models like epidemic dynamics with a non-homogeneous infection rate.

Lung-targeted delivery of nsp12 siRNAs restores host type I interferon responses

The RNA-dependent RNA polymerase (RdRp) of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), known as nsp12, is crucial to viral replication and spread. Being one of the most conserved proteins of SARS-CoV-2, nsp12 is also a promising therapeutic target for COVID-19. In addition, nsp12 has been reported to suppress the host type I interferon (IFN-I) responses. We used HEK293T cells exogenously expressing nsp12-luciferase to identify siRNAs against nsp12. A series of in vitro and in vivo experiments were employed to examine the effect of RBD-11b-modified cationic liposomes (CLs) on targeted delivery of siRNAs to the mouse lungs. Mice were airway-administered adenovirus to induce the exogenous expression of nsp12 in the mouse lungs, followed by nsp12 siRNAs@RBD-11b-CLs treatment. Nsp12 expression and the activity of the IRF3/IFN-I axis in the lungs were then examined. High-efficiency nsp12 siRNAs were identified and successfully delivered to the mouse lungs by the RBD-11b-modified CLs. The nsp12 siRNAs@RBD-11b-CLs efficiently inhibited the exogenous expression of nsp12 in the mouse lungs. Moreover, nsp12 siRNAs@ RBD-11b-CLs successfully restored the nucleus transport of IRF3, thereby increasing the expression of IFNβ and several IFN effector genes in alveolar cells. We establish a lung targeting system to efficiently deliver siRNAs against SARS-CoV-2 nsp12 and significantly restore host type I interferon responses. This study will provide fresh perspectives and forthcoming approaches for the treatment of COVID-19 and other RNA viruses.

Patient Outcomes and Healthcare Practices Before and After COVID-19 Vaccination: A Comprehensive Analysis

Abstract: The Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) unleashed a global pneumonia pandemic, causing significant harm to both physical and mental health. It emphasized the urgency for specialized therapies and protective measures. Approaches, including immunotherapy, antiviral drugs, and lifestyle improvements, like diet and exercise, have shown promise in controlling viral spread before widespread vaccination. However, COVID-19 vaccinations, while critical for reducing disease severity, have been associated with potential side effects, including transient cognitive impairment, rare renal disorders, physiologic anomalies, and dermatological reactions. The scientific community continues to rigorously study these issues to ensure the safety and efficacy of vaccination programs and to address the multifaceted impact of the pandemic.

Exploring the Link between Smartphone Use, Recorded Violence, and Social Sharing in 80 Case Studies in Italy

The increasing prevalence of violence recorded and shared through smartphones in today’s digital age has raised concerns about the underlying reasons driving such behavior. However, the lack of experimental studies and scientific evidence exploring the relationship between smartphone use and acts of violence has hindered our understanding of this phenomenon. To bridge this gap, the present study aimed to investigate the potential link between smartphone usage and the perpetration of violence, specifically focusing on incidents where violent acts were recorded and shared publicly. Given the challenges associated with directly observing such occurrences and the limitations of self-reporting due to social desirability bias, the study adopted a novel approach by analyzing major news outlets. Cross-referencing the most recent cases involving 80 episodes of violence, spanning from 2017 to 2023, accompanied by smartphone-recorded videos, the research aimed to gain insights into the role and outcomes of content dissemination. The findings revealed a concerning trend, indicating a rise in violence perpetrated with the aid of smartphones, where subsequent sharing on social networks and instant messaging platforms contributed to the viral spread of such content. This study provides valuable insights into the connection between smartphone usage, violence, and the sharing of violent content. The implications of these findings highlight the need for further research and the development of tools to detect and address violence-related issues in the digital space. Moreover, it emphasizes the importance of responsible social media usage and collective efforts to curb the spread of violent content and foster a safer online environment.

The Dynamic Relationship between Dengue Virus and the Human Cutaneous Innate Immune Response.

Dengue virus (DENV) is a continuing global threat that puts half of the world's population at risk for infection. This mosquito-transmitted virus is endemic in over 100 countries. When a mosquito takes a bloodmeal, virus is deposited into the epidermal and dermal layers of human skin, infecting a variety of permissive cells, including keratinocytes, Langerhans cells, macrophages, dermal dendritic cells, fibroblasts, and mast cells. In response to infection, the skin deploys an array of defense mechanisms to inhibit viral replication and prevent dissemination. Antimicrobial peptides, pattern recognition receptors, and cytokines induce a signaling cascade to increase transcription and translation of pro-inflammatory and antiviral genes. Paradoxically, this inflammatory environment recruits skin-resident mononuclear cells that become infected and migrate out of the skin, spreading virus throughout the host. The details of the viral-host interactions in the cutaneous microenvironment remain unclear, partly due to the limited body of research focusing on DENV in human skin. This review will summarize the functional role of human skin, the cutaneous innate immune response to DENV, the contribution of the arthropod vector, and the models used to study DENV interactions in the cutaneous environment.

Sinefungin analogs targeting VP39 methyltransferase as potential anti-monkeypox therapeutics: a multi-step computational approach.

The increasing spread of the Monkeypox virus (MPXV) presents a significant public health challenge, emphasising the urgent requirement for effective treatments. Our study focuses on the VP39 Methyltransferase enzyme of MPXV as a critical target for therapy. By utilising virtual screening, we investigated natural compounds with structural similarities to sinefungin, a broad-acting MTase inhibitor. From an initial set of 177 compounds, we identified three promising compounds-CNP0346326, CNP0343532, and CNP008361, whose binding scores were notably close to that of sinefungin. These candidates bonded strongly to the VP39 enzyme, hinting at a notable potential to impede the virus. Our rigorous computational assays, including re-docking, extended molecular dynamics simulations, and energetics analyses, validate the robustness of these interactions. The data paint a promising picture of these natural compounds as front-runners in the ongoing race to develop MPXV therapeutics and set the stage for subsequent empirical trials to refine these discoveries into actionable medical interventions.

MPoMA protects against lung epithelial cell injury via p65 degradation

Numerous cases of lung injury caused by viral infection were reported during the coronavirus disease-19 pandemic. While there have been significant efforts to develop drugs that block viral infection and spread, the development of drugs to reduce or reverse lung injury has been a lower priority. This study aimed to identify compounds from a library of compounds that prevent viral infection that could reduce and prevent lung epithelial cell damage. We investigated the cytotoxicity of the compounds, their activity in inhibiting viral spike protein binding to cells, and their activity in reducing IL-8 production in lung epithelial cells damaged by amodiaquine (AQ). We identified N-(4-(4-methoxyphenoxy)-3-methylphenyl)-N-methylacetamide (MPoMA) as a non-cytotoxic inhibitor against viral infection and AQ-induced cell damage. MPoMA inhibited the expression of IL-8, IL-6, IL-1β, and fibronectin induced by AQ and protected against AQ-induced morphological changes. However, MPoMA did not affect basal IL-8 expression in lung epithelial cells in the absence of AQ. Further mechanistic analysis confirmed that MPoMA selectively promoted the proteasomal degradation of inflammatory mediator p65, thereby reducing intracellular p65 expression and p65-mediated inflammatory responses. MPoMA exerted potent anti-inflammatory and protective functions in epithelial cells against LPS-induced acute lung injury in vivo. These findings suggest that MPoMA may have beneficial effects in suppressing viral infection and preventing lung epithelial cell damage through the degradation of p65 and inhibition of the production of inflammatory cytokines.

308 Awardee Talk: Prevention and mitigation of pathogens in feed and feed manufacturing systems

Abstract Prior to 2013, pathogen transmission through feed was focused primarily on bacteria and biosecurity was used to prevent adulterant entry into the ingredients and the feed mills. Following the porcine epidemic diarrhea virus (PEDV) outbreak in 2013, research focused on pathogen mitigation and control quickly became a subject of interest. Since PEDV, multiple endemic viruses and foreign animal diseases have been found to be transmissible in feed or feed ingredients. As African swine fever virus (ASFV) spread closer to the United States and endemic pathogens are a continued pressure on production systems, it is imperative that prevention measures are included in the feed supply chain and options for mitigation are fully elucidated for times of need. Previous research has demonstrated that preventative measures such as boot baths, lines of separation, showers, and changing clothes are effective measures when appropriately maintained. However, these protocols can seem costly and burdensome to employees, especially when the risk of disease transmission appears low. Employee training is difficult as disease transmission is difficult to visualize and exhibit the importance of each measure. Glo Germ, a florescent substance, is a cost-effective training tool which can demonstrate the efficacy of prevention protocols and can identify areas where biosecurity measures have not been properly utilized. Preventative measures are the first line of defense for feed manufacturing systems, but understanding and using mitigation techniques in the event of contamination can limit pathogen spread and protect the rest of the feed supply chain. Pelleting, as a method of thermal inactivation process, has recently been demonstrated to lessen the quantity of detectable viral RNA and decrease the risk of infection. The pelleting process, however, is a point-in-time mitigant and does not decrease the risk of product re-contamination as feed continues down the supply chain. The use of chemical mitigants, like formaldehyde, medium-chain fatty acids, and organic acids, can decrease the presence of bacterial and viral pathogens with longer-lasting mitigation properties. These mitigants can either be used in the feed itself, or as an addition to flushing batches which help disperse the chemical mitigants throughout the feed manufacturing equipment, thus reducing the risk of product re-contamination. In the event more drastic measures must be taken to eliminate pathogen presence from feed mills, gaseous fumigation and the use of portable heaters show promise as methods to decontaminate feed manufacturing equipment without the use of water or complete equipment breakdown. Overall, effective training and implementation of preventative measures are needed to provide pathogen-free feed to production systems, but continued research in mitigation and mill decontamination will further protect the feed supply chain in the event of pathogen contamination.

COVID-19 OUTBREAK IMPACT ON THE INDIANS

The impact of the COVID-19 outbreak in India, though possibly surpassing its peak caseload in 2023, continues to have a profound effect on the nation's health, society, and economy. While the public health system managed the initial surge, it now faces ongoing challenges due to resource and personnel strain. The heightened demands during the peak may have resulted in neglect of preventative and diagnostic care for non-COVID ailments. Socioeconomic gaps widened as the pandemic disproportionately affected informal workers and low-income communities, pushing many further into poverty through lockdowns, business closures, and job losses. The lasting economic consequences are still unfolding, potentially leading to a decline in GDP and investment. Mental health emerged as a significant concern, with lockdowns, social isolation, and fear contributing to increased depression, anxiety, and other issues. Although India has made progress in curbing the virus's spread, achieving full recovery will likely be a prolonged process requiring sustained efforts to bolster the healthcare system, address socioeconomic disparities, and offer mental health support to the population.

Impact of susceptible wheat cultivars on epidemiological parameters involved in the introduction and spread of wheat dwarf disease

AbstractDefence mechanisms in plants have been naturally or artificially selected to cope with virus infection and/or insect colonization. This creates a range of host susceptibility to viruses and/or insects that can impact the epidemiology of insect‐borne viral diseases. Wheat dwarf disease (WDD), one of the most important viral diseases on small‐grain cereals, is caused by wheat dwarf virus (WDV), which is transmitted by the leafhopper Psammotettix alienus. In the current context of the unavailability of either WDV‐resistant/tolerant wheat cultivars or effective methods to control WDD in French cereal fields, the accurate characterization of WDV‐susceptible genotypes must be considered to improve management strategies against this viral disease. In this study, the impact of 12 wheat cultivars on epidemiological parameters related to the introduction (host selection and virus infection) and spread (insect performance and virus transmission) of WDD was evaluated. Results showed no differences between the tested cultivars for host selection made by P. alienus, whereas four tested cultivars (Complice, Filon, Hyking and Nemo) reduced survival and/or fecundity of the leafhopper. Characterization of virus–host interactions highlights the lower host and source quality of cv. Filon for WDV. Finally, multivariate analyses allowed the identification of cvs Filon, Boregar, Solindo CS, Complice and Hyking as less suitable hosts for WDV and/or P. alienus, suggesting that these cultivars could present interesting genetic resource(s) that should be considered for future breeding programmes against WDD.

Modelling phytoplankton-virus interactions: phytoplankton blooms and lytic virus transmission

A dynamic reaction–diffusion model of four variables is proposed to describe the spread of lytic viruses among phytoplankton in a poorly mixed aquatic environment. The basic ecological reproductive index for phytoplankton invasion and the basic reproduction number for virus transmission are derived to characterize the phytoplankton growth and virus transmission dynamics. The theoretical and numerical results from the model show that the spread of lytic viruses effectively controls phytoplankton blooms. This validates the observations and experimental results of Emiliana huxleyi-lytic virus interactions. The studies also indicate that the lytic virus transmission cannot occur in a low-light or oligotrophic aquatic environment.