scholarly journals Acute non-atopic late-onset asthma induced by respiratory infection

2005 ◽  
pp. 53-57
Author(s):  
S. A. Sobchenko ◽  
O. S. Schetchikova ◽  
N. V. Yakovleva

The aim of the study was to investigate features of respiratory infection inducing acute non-atopic late-onset asthma (NLA). Virologic and microbiologic examinations of brash biopsy samples of rhinopharyngeal and bronchial mucosa and bronchial lavage fluid were performed in 116 NLA patients admitted to a hospital in autumn and winter. The leading cause of acute NLA was found to be respiratory viral infections. We noted that different clinical NLA types had different sensibility to various viruses: adenoviruses mainly caused exacerbations of aspirin-induced asthma, respiratory syncytial and influenza A viruses were prevalently determined in non-atopic asthma. Patients with posttuberculotic lesions of the lungs mostly had viral and bacterial associations. Such mixed infection resulted in more severe and prolonged exacerbations of NLA.

2019 ◽  
Vol 42 (3) ◽  
pp. 525-533 ◽  
Author(s):  
Mohamed M Elhakim ◽  
Sahar K Kandil ◽  
Khaled M Abd Elaziz ◽  
Wagida A Anwar

Abstract Background Sentinel surveillance for severe acute respiratory infection (SARI) in Egypt began in 2006 and occurs at eight sites. Avian influenza is endemic, and human cases of influenza A (H5N1) have been reported annually since 2006. This study aimed to describe the epidemiology of SARI at a major sentinel site in the country. Methods Data included in the study were collected from a major SARI sentinel site in Egypt during three consecutive years (2013–15). Results A total of 1254 SARI patients conforming to the WHO case definition were admitted to the sentinel site, representing 5.6% of admitted patients for all causes and 36.6% of acute respiratory infection patients. A total of 99.7% of the patients were tested, and 21.04% tested positive; 48.7% of cases involved influenza A viruses, while 25% involved influenza B. The predominant age group was under 5 years of age, accounting for 443 cases. The seasonality of the influenza data conformed to the Northern Hemisphere pattern. Conclusions The present study’s results show that SARI leads to substantial morbidity in Egypt. There is a great need for high-quality data from the SARI surveillance system in Egypt, especially with endemic respiratory threats such as influenza A (H5N1) in Egypt.


2019 ◽  
Author(s):  
Elizabeth Sloan ◽  
Marta Alenquer ◽  
Liliane Chung ◽  
Sara Clohisey ◽  
Adam M. Dinan ◽  
...  

AbstractSegmented negative-strand RNA viruses (sNSVs) include the influenza viruses, the bunyaviruses, and other major pathogens of humans, other animals and plants. The genomes of these viruses are extremely short. In response to this severe genetic constraint, sNSVs use a variety of strategies to maximise their coding potential. Because the eukaryotic hosts parasitized by sNSVs can regulate gene expression through low levels of translation initiation upstream of their canonical open reading frames (ORFs), we asked whether sNSVs could use upstream translation initiation to expand their own genetic repertoires. Consistent with this hypothesis, we showed that influenza A viruses (IAVs) and bunyaviruses were capable of upstream translation initiation. Using a combination of reporter assays and viral infections, we found that upstream translation in IAVs can initiate in two unusual ways: through non-AUG initiation in virally encoded ‘untranslated’ regions, and through the appropriation of an AUG-containing leader sequence from host mRNAs through viral cap-snatching, a process we termed ‘start-snatching.’ Finally, while upstream translation of cellular genes is mainly regulatory, for sNSVs it also has the potential to create novel viral gene products. If in frame with a viral ORF, this creates N-extensions of canonical viral proteins. If not, it allows the expression of cryptic overlapping ORFs, which we found were highly conserved in IAV and widely distributed in peribunyaviruses. Thus, by exploiting their host’s capacity for upstream translation initiation, sNSVs can expand still further the coding potential of their extremely compact RNA genomes.


2012 ◽  
Vol 2012 ◽  
pp. 1-14 ◽  
Author(s):  
Wy Ching Ng ◽  
Michelle D. Tate ◽  
Andrew G. Brooks ◽  
Patrick C. Reading

Host defenses against viral infections depend on a complex interplay of innate (nonspecific) and adaptive (specific) components. In the early stages of infection, innate mechanisms represent the main line of host defense, acting to limit the spread of virus in host tissues prior to the induction of the adaptive immune response. Serum and lung fluids contain a range of lectins capable of recognizing and destroying influenza A viruses (IAV). Herein, we review the mechanisms by which soluble endogenous lectins mediate anti-IAV activity, including their role in modulating IAV-induced inflammation and disease and their potential as prophylactic and/or therapeutic treatments during severe IAV-induced disease.


Author(s):  
Е.И. Краснова ◽  
В.В. Проворова ◽  
Н.И. Хохлова ◽  
Т.А. Колпакова ◽  
Т.И. Петренко

Наиболее частыми формами инфекций нижних дыхательных путей в практике врача являются острый бронхит и внебольничная пневмония. Врачу приходится принимать решение о тактике ведения таких пациентов с учетом клинической картины и результатов обследования. Внебольничная пневмония является распространенным и потенциально угрожающим жизни заболеванием органов дыхания. Острота проблемы состоит в том, что в периоды эпидемий гриппа или других респираторных вирусных инфекций, когда активируется Streptococcus рneumoniae, отмечается рост заболеваемости внебольничной пневмонией. Однако последние годы показали, что этиология пневмонии значительно расширилась и среди причин внебольничной пневмонии важное место помимо бактерий стали занимать пневмотропные вирусы (новый коронавирус SARS-CoV-2, MERS, вирусы гриппа А, в т. ч. пандемичесий H1N1, птичьего гриппа, бокавирусы, метапневмовирусы и др.). Ассоциация бактерий и вирусов утяжеляет течение болезни. В мире пневмонией ежегодно болеют 5-8 человек на 1 тыс. взрослого населения, в Европе – 2-15. В России случаи внебольничной пневмонии у взрослых превышают 1,5 млн в год. В 2020 г. в России зарегистрирован значительный рост заболеваемости по внебольничной пневмонии – в 3,6 раза (1856,18 на 100 тыс. населения), в том числе по вирусной пневмонии – в 109 раз (783,08 на 100 тыс. населения), что обусловлено распространением нового коронавируса SARS-CoV-2. Рассмотрены подходы к диагностике и медикаментозной терапии бронхита и внебольничной пневмонии. Оценена клиническая эффективность лечения, включающего прием амоксициллина, результаты позволяют рекомендовать амоксициллин для использования в амбулаторной практике. The most frequent forms of lower respiratory tract infections in practice of the doctor are the acute bronchitis and community-acquired pneumonia. The doctor should make the decision on tactics of maintaining such patients taking into account a clinical picture and results of inspection. Community-acquired pneumonia is a common and potentially life-threatening respiratory disease. The severity of the problem is that during periods of influenza epidemics or other respiratory viral infections, when Streptococcus pneumoniae is activated, there is an increase in the incidence of community-acquired pneumonia. However, recent years have shown that the etiology of pneumonia has expanded significantly, and among the causes of community-acquired pneumonia, in addition to bacteria, pneumotropic viruses began to occupy an important place (new coronavirus SARS-CoV-2, MERS, influenza A viruses, including pandemic H1N1, avian influenza, bocaviruses, metapneumoviruses, etc.). The association of bacteria and viruses makes the disease worse. In the world, 5-8 people per 1,000 adults suffer from pneumonia annually, in Europe – 2-15. In Russia, cases of community-acquired pneumonia in adults exceed 1,5 million per year. In 2020, Russia registered a significant increase in the incidence of community-acquired pneumonia – 3,6 times (1856,18 per 100 thousand population), including viral pneumonia – 109 times (783,08 per 100 thousand population) due to the spread of the new coronavirus SARS-CoV-2. Approaches to diagnostics and medicamentous therapy of bronchitis and community-acquired pneumonia are considered. Clinical performance of the treatment including intake of amoxicillin is estimated, results allow to recommend amoxicillin for use in out-patient practice.


2003 ◽  
Vol 10 (4) ◽  
pp. 680-685 ◽  
Author(s):  
Alessandra Desogus ◽  
Roberto Burioni ◽  
Angela Ingianni ◽  
Francesca Bugli ◽  
Raffaello Pompei ◽  
...  

ABSTRACT A human recombinant monoclonal Fab fragment that specifically recognizes all the influenza A virus strains tested was produced in transformed Escherichia coli using the phage display technique. No strain of influenza B virus reacted with it. It was purified after four cycles of panning and by a single passage through an immunoaffinity column. About 1 mg of pure monoclonal antibody was obtained from 1 liter of culture medium in 3 working days. The Fab fragment reacted with a viral 27-kDa protein, which could reasonably be a matrix protein. Indirect immunofluorescence tests performed on virus-infected MDCK cells showed that this Fab fragment was at least equally efficient as other commercial monoclonal antibody-based systems in detecting influenza A viral infections. The potential advantages of human recombinant Fabs on murine monoclonal antibodies are discussed.


2016 ◽  
Vol 9 (2) ◽  
pp. 145-161 ◽  
Author(s):  
Bastian Hatesuer ◽  
Hang Thi Thu Hoang ◽  
Peggy Riese ◽  
Stephanie Trittel ◽  
Ingo Gerhauser ◽  
...  

The interferon (IFN) pathway plays an essential role in the innate immune response following viral infections and subsequent shaping of adaptive immunity. Infections with influenza A viruses (IAV) activate the IFN pathway after the recognition of pathogen-specific molecular patterns by respective pattern recognition receptors. The IFN regulatory factors IRF3 and IRF7 are key players in the regulation of type I and III IFN genes. In this study, we analyzed the role of IRF3 and IRF7 for the host response to IAV infections in Irf3-/-, Irf7-/-, and Irf3-/-Irf7-/- knockout mice. While the absence of IRF3 had only a moderate impact on IFN expression, deletion of IRF7 completely abolished IFNα production after infection. In contrast, lack of both IRF3 and IRF7 resulted in the absence of both IFNα and IFNβ after IAV infection. In addition, IAV infection of double knockout mice resulted in a strong increase of mortality associated with a massive influx of granulocytes in the lung and reduced activation of the adaptive immune response.


2019 ◽  
Vol 91 (11) ◽  
pp. 105-109
Author(s):  
N Y Pshenichnaya ◽  
V A Bulgakova ◽  
E V Volchkova ◽  
E N Kareva ◽  
E P Selkova ◽  
...  

Aim: to determine the perspectives for the use of drugs with combined antiviral, anti - inflammatory and immunomodulatory activity on the basis of medical studies of existing antiviral drugs for the treatment of influenza and acute respiratory viral infections in Russia. Materials and methods. A brief review of the antiviral drugs used in Russia for the treatment of influenza and acute respiratory viral infections was conducted on the basis of 37 articles published in Scopus, Web of Science (WoS), and RSCI databases in the period from 1997 to 2018. Results. Resistance to neuraminidase inhibitors (oseltamivir, zanamivir), is slowly developing due to the mutations of the neuraminidase gene H275Y and Q136K. Most influenza A viruses remain resistant to adamantane antivirals. Repeated use of immunomodulators with indirect antiviral action leads to a hyporeactivity of the immune system and, subsequently, to a decrease in their effectiveness. Positive clinical and laboratory data in clinical trials were obtained using Enisamium iodide, a drug with combined action - direct antiviral, and immunomodulatory. Conclusion. According to the WHO strategy, the results of the review demonstrate the need for continued research of medications with combined antiviral and pathogenetic effects on the infectious process caused by influenza and acute respiratory viral infections.


2022 ◽  
Vol 10 (1) ◽  
pp. 133
Author(s):  
Daniel S. Layton ◽  
Kostlend Mara ◽  
Meiling Dai ◽  
Luis Fernando Malaver-Ortega ◽  
Tamara J. Gough ◽  
...  

Influenza A viruses (IAV) pose a constant threat to human and poultry health. Of particular interest are the infections caused by highly pathogenic avian influenza (HPAI) viruses, such as H5N1, which cause significant production issues. In response to influenza infection, cells activate immune mechanisms that lead to increased interferon (IFN) production. To investigate how alterations in the interferon signaling pathway affect the cellular response to infection in the chicken, we used CRISPR/Cas9 to generate a chicken cell line that lacks a functional the type I interferon receptor (IFNAR1). We then assessed viral infections with the WSN strain of influenza. Cells lacking a functional IFNAR1 receptor showed reduced expression of the interferon stimulated genes (ISG) such as Protein Kinase R (PKR) and Myxovirus resistance (Mx) and were more susceptible to viral infection with WSN. We further investigated the role or IFNAR1 on low pathogenicity avian influenza (LPAI) strains (H7N9) and a HPAI strain (H5N1). Intriguingly, Ifnar−/− cells appeared more resistant than WT cells when infected with HPAI virus, potentially indicating a different interaction between H5N1 and the IFN signaling pathway. Our findings support that ChIFNAR1 is a key component of the chicken IFN signaling pathway and these data add contributions to the field of host-avian pathogen interaction and innate immunity in chickens.


2018 ◽  
Vol 63 (5) ◽  
pp. 233-239 ◽  
Author(s):  
M. M. Pisareva ◽  
V. A. Eder ◽  
Zh. V. Buzitskaya ◽  
T. D. Musaeva ◽  
V. S. Afanaseva ◽  
...  

The etiological structure of influenza and other acute respiratory viral infections including their rate of incidence in St. Petersburg and Leningrad region during 4 epidemic seasons has been studied. Seasonality of some respiratory viruses was shown and peaks of circulation of RSV, adenovirus, parainfluenza viruses, rhinovirus, bocavirus, metapneumovirus and coronavirus were marked. The interference of influenza A viruses and RSV, RSV and rhinoviruses was highlighted. A high incidence of adenovirus infection in organized communities and RSV infection in children was revealed.


2017 ◽  
Vol 4 (suppl_1) ◽  
pp. S318-S318
Author(s):  
Alastair Teale ◽  
Lori Zapernick ◽  
Geoffrey Taylor ◽  
Stephanie Smith

Abstract Background Respiratory viral infections (RVI) are commonly seen in hospitalized patients. While many studies have examined outcomes with influenza, fewer studies have examined outcomes of community and hospital acquired infections of other respiratory viruses. Methods Data were prospectively collected from adult (age>17 years) inpatients with a positive result from respiratory viral multiplex panel testing during consecutive viral respiratory seasons from November 2014 to April 2017 at our facility. Ambulatory patients were excluded. Clinical outcomes including ICU admission requiring intubation, overall mortality and respiratory virus infection-related mortality was assessed at 30 days post infection. Results A total of 731 inpatients with positive results were identified. Influenza A was the most commonly detected virus (44%) followed by respiratory syncytial virus (RSV)(14%) and rhinovirus/enterovirus (13%). Rates of RSV and human metapneumovirus infections displayed significant yearly variability. There were no significant differences in rates of ICU admission requiring intubation (16.8% vs. 14.3% P = 0.35) between infections caused by influenza A and B and other respiratory viruses. In addition, mortality related to respiratory infections between these groups was also similar (5.7% Influenza vs. 4.5% non-Influenza P = 0.46). Ninety-five (15%) of identified patients had hospital acquired respiratory viral infections. Influenza A was the most commonly isolated hospital acquired infection (39%). Rates of ICU admission requiring intubation (22.6% vs. 14.6%, P = 0.06) and respiratory infection-related mortality (7.4% vs. 4.8%, P = 0.14) were higher in hospital acquired RVI but did not meet statistical significance. Less than half (45%) of all patients testing positive for influenza received antiviral treatment (oseltamivir). Respiratory infection-related mortality was not significantly different between those who were treated and those who were not treated (5.5% vs. 4.4%, P = 0.64). Conclusion While influenza remains the most common community and hospital acquired respiratory viral infection in inpatients at our facility, half of infections were attributed to other respiratory viruses and these resulted in similar rates of serious outcomes including ICU admission and mortality. Disclosures All authors: No reported disclosures.


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