Respiratory Infectious Diseases Research Articles

Delivery of Agarose-aided Sprays to the Posterior Nose for Mucosa Immunization and Short-term Protection against Infectious Respiratory Diseases.

The study aimed to deliver sprays to the posterior nose for mucosa immunization or short-term protection. Respiratory infectious diseases often enter the human body through the nose. Sars-Cov-2 virus preferentially binds to the ACE2-rich tissue cells in the nasopharynx (NP). Delivering medications to the nose, especially to the NP region, provides either a short-term protective/therapeutic layer or long-term mucosa immunization. Hydrogel-aided medications can assist film formation, prolong film life, and control drug release. However, conventional nasal sprays have failed to dispense mediations to the posterior nose, with most sprays lost in the nasal valve and front turbinate. The objective of the study was to develop a practical delivery system targeting the posterior nose and quantify the dosimetry distribution of agarose-saline solutions in the nasal cavity. The solution viscosities with various hydrogel concentrations (0.1-1%) were measured at different temperatures. Dripping tests on a vertical plate were conducted to understand the hydrogel concentration effects on the liquid film stability and mobility. Transparent nasal airway models were used to visualize the nasal spray deposition and liquid film translocation. Spray dosimetry with different hydrogel concentrations and inhalation flow rates was quantified on a total and regional basis. The solution viscosity increased with decreasing temperature, particularly in the range of 60-40 oC. The liquid viscosity, nasal spray atomization, and liquid film mobility were highly sensitive to the hydrogel concentration. Liquid film translocations significantly enhanced delivered doses to the caudal turbinate and nasopharynx when the sprays were administered at 60 oC under an inhalation flow rate of 11 L/min with hydrogel concentrations no more than 0.5%. On the other hand, sprays with 1% hydrogel or administered at 40 oC would significantly compromise the delivered doses to the posterior nose. Delivering sufficient doses of hydrogel sprays to the posterior nose is feasible by leveraging the post-administration liquid film translocation.

Investigating the effects of Laggera pterodonta on H3N2-Induced inflammatory and immune responses through network pharmacology, molecular docking, and experimental validation in a mice model

For centuries, Laggera pterodonta (LP), a Chinese herbal medicine, has been widely employed for treating respiratory infectious diseases; however, the mechanism underlying LP's effectiveness against the influenza A/Aichi/2/1968 virus (H3N2) remains elusive. This study aims to shed light on the mechanism by which LP combats influenza in H3N2-infected mice. First, we conducted quasi-targeted metabolomics analysis using liquid chromatography-mass spectrometry to identify LP components. Subsequently, network pharmacology, molecular docking, and simulation were conducted to screen candidate targets associated with AKT and NF-κB. In addition, we conducted a series of experiments including qPCR, hematoxylin-eosin staining, flow cytometry, immunohistochemistry, and enzyme-linked immunosorbent assay to provide evidence that LP treatment in H3N2-infected mice can reduce pro-inflammatory cytokine levels (TNF-α, IL-6, IL-1β, and MCP-1) while increasing T cells (CD3+, CD4+, and CD8+) and syndecan-1 and secretory IgA expression. This, in turn, aids in the prevention of excessive inflammation and the fortification of immunity, both of which are compromised by H3N2. Finally, we utilized a Western blot assay to confirm that LP indeed inhibits the AKT/NF-κB signaling cascade. Thus, the efficacy of LP serves as a cornerstone in establishing a theoretical foundation for influenza treatment.

Pharmacological and Therapeutic Features of COVID - 19 Infection in Hodeidah, Yemen

Background: The symptoms and signs of coronavirus diseases 2019 (COVID-19) present at illness onset vary, but over the course of the disease, most persons with COVID-19 will experience the following: fever, cough, fatigue, anorexia, shortness of breath, hypoxia, sputum production, and myalgia. During the first year (2020), there was no effective cure for COVID-19 infection and the most common treatment for patients was supportive therapy. Ministry of Public Health and Population in Yemen presented national guideline that is extracted from other countries and World Health Organization (WHO). Objective: Therefore, in this research, we discuss the pharmacological and therapeutic approaches for management of COVID-19 during its early period of rampage, using availability of medicines in Yemeni local pharmaceutical marketing. On the other hand, the efficacy of therapeutic was monitored. Methodology: 505 patients with COVID-19 from Hodeidah showed that respiratory infection illness can range from mild to critical. Mild to moderate was 386 case (78.93 %), severe cases was 73 cases (15.13 %) and critical cases was 28 cases (5.93 %). The major criteria for cases admission namely clinical examination, case definition, clinical investigation, radiological finding, hematological and biochemical finding and molecular biology assay namely real – time - polymerase chain reaction (RT- PCR). The pharmacological and therapeutic properties of supportive therapy of COVID-19 included" antipyretic agent, antiviral (oseltamivir) analgesic agent, glucocorticoid (dexamethasone), anticoagulant agent (enoxaparin), anti-cough (acetylcysteine), antibiotics broad spectrum to treat the secondary infection namely azithromycin, ceftriaxone, ceftazidime, piperacillin and tazobactam, meropenam, and moxifloxacin. In addition, oxygen therapy is the major treatment that used in treatment of severe and critical cases. Also, vitamins (C and D) and mineral namely zinc were prescribed and proton pump inhibitor (PPI) (pantaprazol), anti-emetic (Ondansetron). Fluid therapy namely ringer lactate or normal saline were used in management of COVID -19. Results: The results showed that the age of the patients included in this study between 3- 92 years with 4.0 to 1.0 males: females. 49 patients were admitted in COVID-19 isolation department of Hodeidah, Yemen. 25/49 cases (54.34% ) were recovered with national guideline, the average of RR pre - treatment was 30 ± 5 breath / minute and reduced to 23 ± 2 breath / minute post – treatment with significantly statistically different (p < 0.05). On the other hand, the clinical symptoms namely difficult in breathing, cough, fever, and headache reduced to absent absolutely (100 %). In addition, the results showed that the average of WBC pre - treatment was 20 ± 4 (×109/L) and reduced to 7 ± 2 (×109/L) post – treatment with significantly statistically different (p < 0.05). Also, lymphocytes decreased with COVID -19 infection to 2 % with average (10±5%) and improved post - treatment to 20 %. In addition, neutrophil increased to 95 % with average (80±15%) and improved to 70 % post-treatment. the average of WBC pre - treatment was 20 ± 4 (×109/L) and reduced to 7 ± 2 (×109/L) post-treatment with significantly statistically different (p < 0.05). The outcome finding of management that 19 cases (3.88 %) of severe and 6 cases (1.22 %) of critical were recovered. On the other hand, 1 case of severe and 21 cases of critical COVID-19 were died. Conclusion: In spite of lack of specific antiviral drugs, the approach of pharmacology and therapeutics had good impact at level of mild to moderate cases, and severe cases while the critical cases needs to develop at level critical cases in intensive care unit (ICU) with mechanical ventilation (MV) procedure.

Complete genome sequences of Mycoplasma cynos and Mycoplasma felis isolated from dogs and cats with infectious respiratory disease.

Mycoplasma cynos is a primary agent of pneumonia in dogs, and Mycoplasma felis is associated with upper respiratory tract disease in cats. We present complete genome sequences of 26 isolates from clinically affected dogs and cats. These genome sequences will facilitate new molecular and epidemiological analyses.

An Automatic Implementation of Oropharyngeal Swab Sampling for Diagnosing Respiratory Infectious Diseases via Soft Robotic End-Effectors

The most widely adopted method for diagnosing respiratory infectious diseases is to conduct polymerase chain reaction (PCR) assays on patients’ respiratory specimens, which are collected through either nasal or oropharyngeal swabs. The manual swab sampling process poses a high risk to the examiner and may cause false-negative results owing to improper sampling. In this paper, we propose a pneumatically actuated soft end-effector specifically designed to achieve all of the tasks involved in swab sampling. The soft end-effector utilizes circumferential instability to ensure grasping stability, and exhibits several key properties, including high load-to-weight ratio, error tolerance, and variable swab-tip stiffness, leading to successful automatic robotic oropharyngeal swab sampling, from loosening and tightening the transport medium tube cap, holding the swab, and conducting sampling, to snapping off the swab tail and sterilizing itself. Using an industrial collaborative robotic arm, we integrated the soft end-effector, force sensor, camera, lights, and remote-control stick, and developed a robotic oropharyngeal swab sampling system. Using this swab sampling system, we conducted oropharyngeal swab-sampling tests on 20 volunteers. Our Digital PCR assay results (RNase P RNA gene absolute copy numbers for the samples) revealed that our system successfully collected sufficient numbers of cells from the pharyngeal wall for respiratory disease diagnosis. In summary, we have developed a pharyngeal swab-sampling system based on an “enveloping” soft actuator, studied the sampling process, and implemented whole-process robotic oropharyngeal swab-sampling.

Rapid identification of A29L antibodies based on mRNA immunization and high-throughput single B cell sequencing to detect Monkeypox virus

ABSTRACT With the large number of atypical cases in the mpox outbreak, which was classified as a global health emergency by the World Health Organization (WHO) on 23 July 2022, rapid diagnosis of mpox and diseases with similar symptoms to mpox such as chickenpox and respiratory infectious diseases in the early stages of viral infection is key to controlling the spread of the outbreak. In this study, antibodies against the monkeypox virus A29L protein were efficiently and rapidly identified by combining rapid mRNA immunization with high-throughput sequencing of individual B cells. We obtained eight antibodies with a high affinity for A29L validated by ELISA, which were was used as the basis for developing an ultrasensitive fluorescent immunochromatographic assay based on multilayer quantum dot nanobeads (SiTQD-ICA). The SiTQD-ICA biosensor utilizing M53 and M78 antibodies showed high sensitivity and stability of detection: A29L was detected within 20 min, with a minimum detection limit of 5 pg/mL. A specificity test showed that the method was non-cross-reactive with chickenpox or common respiratory pathogens and can be used for early and rapid diagnosis of monkeypox virus infection by antigen detection. This antibody identification method can also be used for rapid acquisition of monoclonal antibodies in early outbreaks of other infectious diseases for various studies.

Activated Leukocyte Cell Adhesion Molecule Regulates the Expression of Interleukin-33 in RSV Induced Airway Inflammation by Regulating MAPK Signaling Pathways.

The respiratory syncytial virus (RSV) is a common respiratory virus that causes acute lower respiratory tract infectious diseases, particularly in young children and older individuals. Activated leukocyte cell adhesion molecule (ALCAM) is a membrane glycoprotein expressed in various cell types, including epithelial cells, and is associated with inflammatory responses and various cancers. However, the precise role of ALCAM in RSV-induced airway inflammation remains unclear, and our study aimed to explore this gap in the literature. C57BL/6 wild-type, ALCAM knockout mice and airway epithelial cells were infected with RSV and the expression of ALCAM and inflammatory cytokines were measured. We also conducted further experiments using Anti-ALCAM antibody and recombinant ALCAM in airway epithelial cells. The expression levels of ALCAM and inflammatory cytokines increased in both RSV-infected mice and airway epithelial cells. Interestingly, IL-33 expression was significantly reduced in ALCAM-knockdown cells compared to control cells following RSV infection. Anti-ALCAM antibody treatment also reduced IL-33 expression following RSV infection. Furthermore, the phosphorylation of ERK1/2, p38, and JNK was diminished in ALCAM-knockdown cells compared to control cells following RSV infection. Notably, in the control cells, inhibition of these pathways significantly decreased the expression of IL-33. In vivo study also confirmed a reduction in inflammation induced by RSV infection in ALCAM deficient mice compared to wild-type mice. These findings demonstrate that ALCAM contributes to RSV-induced airway inflammation at least partly by influencing IL-33 expression through mitogen-activated protein kinase signaling pathways. These results suggest that targeting ALCAM could be a potential therapeutic strategy for alleviating IL-33-associated lung diseases.

The Moderating Role of Anxiety and Depressive Symptoms in Protective Effects of Health Behaviors among Clients Using Mental Health Services.

College-student clients using mental health services contend with increased anxiety and depressive symptoms, and their vulnerability to infectious respiratory diseases and severe clinical outcomes rises. To mitigate severe outcomes, health behaviors serve as essential protective tools to reduce the risk of infectious diseases, including COVID-19. Considering the escalating prevalence of anxiety and depression among college-student clients, little is known about how anxiety and depressive symptoms could potentially attenuate the protective effects of COVID-19 health behaviors (i.e., masking, social distancing, and hygiene practice). This study aims to examine the interactive effects of anxiety/depression and health behaviors in predicting COVID-19 infection. Methods: We analyzed data from the 2020-2021 Healthy Mind Study including a random sample of 9884 college-student clients in mental health services across 140 higher education institutions in the United States. We performed multivariable logistic regression to assess whether and to what extent the associations between COVID-19 health behaviors and infection depended on severity of anxiety or depressive symptoms. Results: Anxiety symptom severity negatively moderated the protective effects of social distancing against infection after adjusting for demographic characteristics and pre-existing chronic health conditions. Depressive symptom severity negatively moderated the protective effects of masking, social distancing, or hygiene practices against infection. Conclusion: The associations between certain COVID-19 health behaviors and infection were conditional on anxiety and depressive symptom severity. Findings suggest a potential public health benefit of mental health clinicians' efforts in assessing and treating clients' anxiety and depressive symptoms, namely reducing their vulnerability to COVID-19 infection and perhaps other infectious respiratory diseases.

YY1 Contributes to the Inflammatory Responses of Mycobacterium tuberculosis-Infected Macrophages Through Transcription Activation-Mediated Upregulation TLR4.

Tuberculosis (TB) is a chronic respiratory infectious disease and is induced by Mycobacterium tuberculosis (M.tb) infection. Macrophages serve as the cellular home in immunoreaction against M.tb infection, which is tightly regulated through Toll-like receptor 4 (TLR4) expression. Therefore, this study is designed to explore the role and mechanism of TLR4 in mycobacterial injury in human macrophages (THP-1 cells) after M.tb infection. Cell proliferation and apoptosis were assessed using MTT, EdU, and flow cytometry assays. ELISA kits were utilized to assess the levels of Interleukin-6 (IL-6), IL-1β, and tumor necrosis factor α (TNF-α). The binding between Yin-Yang-1 (YY1) and TLR4 promoter was predicted by JASPAR and verified using Chromatin immunoprecipitation (ChIP) and dual-luciferase reporter assays. M.tbinfection might repress THP-1 cell proliferation, and induce cell apoptosis and inflammatory response in a multiplicity of infection (MOI)-dependent manner. Moreover, M.tbinfection increasedtheexpressionofTLR4 inHTP-1cellsinanMOI-dependent way, and its downregulation might overturn M.tbinfection-mediated HTP-1cell damage and inflammatory response. At the molecular level, YY1 was a transcription factor of TLR4 and promoted TLR4 transcription via binding to its promoter region. Besides, YY1 might activate the NF-kB signaling pathway via regulating TLR4. Meanwhile, TLR4 inhibitor BAY11-7082 might overturn the repression effect of TLR4 on M.tb-infected HTP-1cell damage. YY1-activated TLR4 might aggravate mycobacterial injury in human macrophages after M.tb infection by the NF-kB pathway, providing a promising therapeutic target for TB treatment.

Procalcitonin and Presepsin as Markers of Infectious Respiratory Diseases in Children: A Scoping Review of the Literature.

Procalcitonin and presepsin have been suggested to be able to discriminate bacterial and viral infections, also in children. This scoping review aims to better explore the available evidence around the potential role of these biomarkers in the subgroup of children with respiratory infectious diseases. We performed a systematic scoping review of studies published until March 2023 in the following bibliographic databases: PubMed, EMBASE, Cochrane and SCOPUS. In children with bacterial infection, procalcitonin values ranged from 0.5 ng/mL to 8.31 ng/dL, while in those hospitalized in an intensive care unit ranged from 0.6 ng/dL to 452.8 ng/dL with PCR from 2 ng/dL to 51.7 ng/dL. In children with viral infections, procalcitonin value values ranged from 0.2 ng/dL to 0.84 ng/dL, while in those hospitalized in an intensive care unit ranged from 0.61 ng/dL to 46.6 ng/dL. No studies on presepsin in children with respiratory infections were retrieved. Although the available literature is highly heterogeneous, evidence does not suggest a role of procalcitonin in accurately differentiating bacterial and viral infections in children with respiratory infections. In future, new approaches based on multiple markers may better help determine which febrile children require antibiotics.

Comparative Analysis of Threshold Cycle Results for RNA Extraction in SARS-CoV-2 RT-qPCR Using Magnetic Beads and Spin Column Methods

Coronavirus Disease-2019 (COVID-19) belongs to the large family of SARS-CoV viruses, initially emerging in 2002-2003. In humans, this virus triggers respiratory infectious diseases. COVID-19, a new variant of SARS-CoV, was identified in humans following an unprecedented incident in Wuhan, China, in December 2019. This virus typically manifests mild symptoms, including a runny nose, sore throat, cough, and fever. The Nucleic Acid Amplification Test (NAAT), specifically the realtime Reverse Transcription Polymerase Chain Reaction (rRT-PCR) examination, is recommended by the World Health Organization (WHO) for diagnosing COVID-19. This study assessed potential differences in Threshold Cycle results during RNA extraction using magnetic beads compared to spin columns in the SARS-CoV-2 rRT-PCR method. The population for this study was selected through accidental sampling from nasopharyngeal and oropharyngeal swabs of COVID-19 patients obtained between December 2022 and April 2023, with Threshold Cycle values <30,000. The samples were stored at -80°C. The findings revealed that the average N (VIC) was 23.359, and RdRP (FAM) was 25.558 in the Magnetic Beads method, indicating a lower value compared to the average N (VIC) of 29.200 and RdRP (FAM) of 29.661 in the Spin Column method. This suggests that the Magnetic Beads method exhibited greater sensitivity than the Spin Column method. The statistical analysis confirmed these differences, with a P value of 0.003 in N (VIC) and the P value of 0.000 in RdRP (FAM). Consequently, it can be concluded that there is a significant 19.5% difference in the Threshold Cycle during RNA extraction using Magnetic Beads and Spin Column in the examination of the SARS-CoV-2 rRT-PCR method. Keywords: Sars-CoV-2; rRT-PCR; Magnetic Beads; Spin Column; Threshold Cycle.

Yinhuang buccal tablet alters airway microbiota composition and metabolite profile in healthy humans

Ethnopharmacological relevancePerturbations in airway microbiota composition and disruption of microbe-metabolite interactions have been observed in respiratory infectious diseases (RIDs). The Yinhuang (YH) buccal tablet, as an ancient Chinese medicinal formula, has been traditionally employed for the management of upper RIDs. However, there is a lack of evidence for the effects of YH buccal tablets on upper respiratory tract microbiota and circulating metabolites. Aim of the studyThe aim of this study was to analyze the changes in respiratory microbiota composition and circulating metabolite profile after YH buccal tablets administration. Materials and methodsThroat swab samples and serum samples were collected from 60 healthy subjects for high-throughput 16S ribosomal RNA gene (16S rRNA) sequencing and non-targeted Ultra-high performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) analysis. ResultsAirway microbial composition changed significantly after YH administration. The abundance of Actinomyces and Prevotella_7 increased, while the abundance of potentially pathogenic Pseudomonas and Corynebacterium decreased. A total of 168 significant HMDB taxonomic metabolites were identified in serum samples, of which lipid metabolites accounted for the largest proportion. Correlation analysis showed that circulatory metabolites were significantly correlated with changes in airway microbiota composition. ConclusionsYH buccal tablets can inhibit opportunistic pathogens, increase beneficial microorganisms in the upper respiratory tract, and regulate the body's metabolic pathways. These findings provide insights into the mechanism of action of YH buccal tablets in the treatment and prevention of respiratory diseases.

Evaluating the Effectiveness of Public Health Measures During Infectious Disease Outbreaks: A Systematic Review.

Over the previous three decades, the incidence of infectious disease outbreaks has considerably increased and the trend is expected to increase further. Public health measures are essential for controlling and preventing emerging outbreaks of infectious illnesses. This study is aimed at evaluating the effectiveness of public health measures during infectious disease outbreaks by summarizing the outcomes from the available evidence in the literature. A systematic review was carried out through a detailed search strategy using specific keywords applied across different electronic databases, including the Science Direct, PubMed, and EMBASE databases. Studies published between 2015 and 2024 were included with a focus on cohorts, clinical trials, longitudinal studies, case-control, and quasi-experimental studies. Low-quality studies and those published before 2015 along withincorrect findings or measures were excluded. A standardized form was used for data extraction. The quality of included studies and the risk of bias were assessed through relevant techniques. The obtained data was narrative synthesized and findings were organized systematically. The reviewed studies revealed that public health measures are considerably effective against infectious disease outbreaks. The success of various measures such as social isolation, confinement measures, and public education on hygiene against different outbreaks of respiratory infectious diseases has been well-established in the literature. Moreover, the timing of intervention application plays a vital role in their success. The implementation in the early phase of an outbreak is highly effective, as it protects more people from infectionand controls the overall burden of the disease. The systematic review provided valuable insights into the efficiency of public health measures in monitoring outbreaks of infectious illnesses. The main findings suggest that appropriate public health interventions are effective in controlling the incidence of contagious disease outbreaks. Ongoing research strives to investigate measures that are most effective from the perspective of public health against various transmittable diseases to prevent future outbreaks.

Prognostic Factors Associated with the Severe Course of a New Coronavirus Infection

Introduction. Novel coronavirus infection (COVID-19) is a respiratory infectious disease caused by the novel severe acute respiratory syndrome 2 coronavirus (SARS-CoV-2). It is characterized by a heterogeneous course of the disease from asymptomatic and mild forms to more severe and fatal outcomes. There are many risk factors for a severe course of a new coronavirus infection, in most cases, a severe course of the disease is associated with the individual characteristics of the patient, especially with dysregulation of the immune response. In this article, we reviewed the main prognostic factors for the severity of the disease.The aim of the study is to determine the unfavorable prognostic factors associated with the severe course of a new coronavirus infection caused by the SARS-CoV-2 virus in foreign and domestic literature sources.Materials and methods. To achieve this goal, scientific publications on the new coronavirus infection caused by the SARS-CoV-2 virus were analyzed in the scientometric databases PubMed, National Center for Biotechnological Information (NCBI), Cochrane, Web of Science, Scopus, MEDLINE (2019–2022), and Russian specialized journals on infectious diseases (2019–2022). Particular attention was paid to factors influencing the severe course of a new coronavirus infection.Results. Risk factors for a severe course of a new coronavirus infection include: lipid spectrum, advanced age, hemostasis system, changes in the leukocyte count, serum markers. Mathematical models of the course of a new coronavirus infection have also been developed.Discussion. In most studies, scientists note that the uncontrolled course of COVID-19 disease is associated with a dysregulated immune response. One of the main methods of influencing the immune system is vaccination.Conclusion. There are many factors that contribute to the development of severe forms of the disease of a new coronavirus infection. However, thanks to universal vaccination against a new coronavirus infection, the frequency of severe forms of the disease and deaths has significantly decreased. Novel coronavirus infection (COVID-19) is a respiratory infectious disease caused by the novel severe acute respiratory syndrome 2 coronavirus (SARS-CoV-2).

The impact of barrier arrangements on the transmission of respiratory infectious diseases in nursing homes in Hong Kong

Respiratory infectious diseases have affected the health of the elderly. This study investigated the optimization of physical barriers as a low-cost design strategy to reduce the risk of infection in nursing homes for the elderly in Hong Kong, which were significantly affected by the outbreak of COVID-19. First, data on two types of rooms, single and multi-occupancy, were collected from a field investigation of typical local nursing homes. Subsequently, Computational Fluid Dynamics (CFD) simulations were employed to analyse the effects of various barrier heights on the propagation, suspension, deposition and elimination of aerosol particles in these room types, thereby evaluating infection risks. The findings reveal that in single-occupancy rooms, a barrier height of 2.1 m is effective in curtailing the spread of the virus over distances. Conversely, in multi-occupancy rooms, while a 1.8-m barrier is necessary, the rate of particle suspension is considerably higher, necessitating additional ventilation measures. Based on these findings, the study provides quantitative criteria for the implementation of physical barriers as a low-cost physical measure in nursing homes and provides recommendations for the effective prevention of respiratory infectious diseases through design modifications.

Integrated Bioinformatics Exploration and Preliminary Clinical Verification for the Identification of Crucial Biomarkers in Severe Cases of COVID-19.

Coronavirus disease 2019 (COVID-19) is a respiratory infectious illness caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). The objective of this study is to identify reliable and accurate biomarkers for the early stratification of disease severity, a crucial aspect that is currently lacking for the impending phases of the next COVID-19 pandemic. In this study, we identified important module and hub genes related to clinical severe COVID-19 using differentially expressed genes (DEGs) screening combing weighted gene co-expression network analysis (WGCNA) in dataset GSE213313. We further screened and confirmed these hub genes in another two new independent datasets (GSE172114 and GSE157103). In order to evaluate these key genes' stability and robustness for diagnosing or predicting the progression of illness, we used RT-PCR validation of selected genes in blood samples obtained from hospitalized COVID-19 patients. A total of 968 and 52 DEGs were identified between COVID-19 patients and normal people, critical and non-critical patients, respectively. Then, using WGCNA, 10 modules were constructed. Among them, the blue module positively associated with clinic disease severity of COVID-19. From overlapped section between DEGs and blue module, 12 intersected common differential genes were obtained. Subsequently, these hub genes were validated in another two new independent datasets as well and 9 genes that overlapped showed a highly correlation with disease severity. Finally, the mRNA expression levels of these hub genes were tested in blood samples from COVID-19 patients. In severe cases, there was increased expression of MCEMP1, ANXA3, CD177, and SCN9A. In particular, MCEMP1 increased with disease severity, which suggested an unfavorable development and a frustrating prognosis. Using comprehensive bioinformatical analysis and the validation of clinical samples, we identified four major candidate genes, MCEMP1, ANXA3, CD177, and SCN9A, which are essential for diagnosis or development of COVID-19.

Numerical study on the onset of global-scale flow from individual buoyant plumes: Implications for indoor disease transmission

Transport of exhaled droplets and aerosol suspension is a main route for the transmission of highly infectious respiratory diseases. A poorly ventilated room, where human body heat drives the flow and the pathogen motion, is one such paradigmatic situation with an elevated risk of viral transmission. Here, we report a numerical study on human body heat-driven buoyancy convection in a slender rectangular geometry with the geometric size of 12 × 1 × 3 m3. Using large-scale three-dimensional simulations, we reveal how different spacings between human body heat sources can potentially spread pathogenic species between occupants in a room. Morphological transition in airflow takes place as the distance between human heat sources is varied, which shapes distinct patterns of disease transmission: For sufficiently large distance, individual buoyant plume creates a natural barrier, forming buoyant jets that block suspension spread between occupants. Thermal plumes exhibit significant individual effects. However, for small distances, a collective effect emerges and thermal plumes condense into superstructure, facilitating long-distance suspension transport via crossing between convection rolls. In addition, we quantify the impact of morphological transition on the transport of viral particles by introducing tracer particles. The quantitative analysis shows that under certain critical distances, the infection risk becomes significantly elevated due to this transition and collective behavior. Our findings highlight the importance of reasonable social distancing to reduce indoor cross-transmission of viral particles between people and provide new insights into the hidden transitional behavior of pathogen transmission in indoor environments.

Inactivation of SARS CoV-2 on porous and nonporous surfaces by compact portable plasma reactor.

We report the inactivation of SARS CoV-2 and its surrogate-Human coronavirus OC43 (HCoV-OC43), on representative porous (KN95 mask material) and nonporous materials (aluminum and polycarbonate) using a Compact Portable Plasma Reactor (CPPR). The CPPR is a compact (48cm3), lightweight, portable and scalable device that forms Dielectric Barrier Discharge which generates ozone using surrounding atmosphere as input gas, eliminating the need of source gas tanks. Iterative CPPR exposure time experiments were performed on inoculated material samples in 3 operating volumes. Minimum CPPR exposure times of 5-15min resulted in 4-5 log reduction of SARS CoV-2 and its surrogate on representative material samples. Ozone concentration and CPPR energy requirements for virus inactivation are documented. Difference in disinfection requirements in porous and non-porous material samples is discussed along with initial scaling studies using the CPPR in 3 operating volumes. The results of this feasibility study, along with existing literature on ozone and CPPR decontamination, show the potential of the CPPR as a powerful technology to reduce fomite transmission of enveloped respiratory virus-induced infectious diseases such as COVID-19. The CPPR can overcome limitations of high temperatures, long exposure times, bulky equipment, and toxic residuals related to conventional decontamination technologies.

Patients' response during the co-circulation of multiple respiratory diseases in China-based on the self-regulation common-sense model.

Following the COVID-19 pandemic, another large-scale respiratory epidemic has emerged in China, causing significant social impact and disruption. The article is to explore the patients' psychological and behavioral responses to the enhancement of healthcare quality. Based on the five dimensions of the Self-Regulation Common-Sense Model, we developed an interview outline to explore the process by which patients identify disease symptoms to guide action plans and coping strategies. The researchers used a semi-structured interview format to simultaneously collect data online and offline. This study gathered data from 12 patients with mixed respiratory infections, comprising 58% females and 42% males; the average age was 30.67 years (SD 20.00), with 91.7% infected with two pathogens and 8.3% with three. The data analysis employed the KJ method, themes were inductively analyzed and categorized from semi-structured interview results, which were then organized into a coherent visual and logical pathway. The study identified 5 themes: (1) Autonomous Actions Prior to Seeking Medical Care; (2) Decision-Making in Seeking Hospital Care; (3) Disease Shock; (4) Public Crisis Response; (5) Information Cocoon. The pandemic of respiratory infectious diseases has not ceased in recent years. Following the COVID-19 pandemic, China is now facing a trend of concurrent epidemics involving multiple respiratory pathogens. This study centers on patients' health behaviors, exploring the potential relationships among various factors that affect these behaviors. The aim is to provide references and grounds for the improvement of healthcare services when such public health events reoccur.

Epidemic trends and prevention and control of seasonal influenza in China after the COVID-19 pandemic

During the COVID-19 pandemic, a series of non-pharmaceutical interventions, which were implemented to curb the spread of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), significantly modified the seasonal pattern of influenza. The intensity of influenza activity markedly decreased and B/Yamagata lineage was no longer detected. As the national influenza sentinel surveillance data shown, clear seasonal patterns were observed for influenza between 2012-2019, annually with an average of 14.57% of specimens tested positive for influenza virus. However, the seasonal pattern of influenza was disrupted after the outbreak of COVID-19. In the 2020-2021 season, influenza demonstrated an extremely low activity (yearly positivity rate<1.0%), followed by a resurgence of winter peak in the 2021-2022 season. Following the downgrade of management of COVID-19 to Class B in China in December 26, 2022, social activities gradually resumed, leading to the rebound of influenza activity with an out-of-season ciculation. After COVID-19 pademic, other respiratory infectious diseases caused by SARS-CoV-2, respiratory syncytial virus, and mycoplasma pneumonia were alternatively or concurrently circulated with influenza. The prevention and control of influenza and other respiratory infectious diseases emphasizes a multi-disease prevention strategy, including long-term and continuous monitoring the epidemic trends in influenza virus and SARS-CoV-2, promoting influenza and COVID-19 vaccination among key populations, and strengthening the knowledge and public awareness of prevention and control for respiratory infectious diseases, etc.