scholarly journals Haemophilus parasuis and Glässer’s disease in pigs: a review

2012 ◽  
Vol 51 (No. 5) ◽  
pp. 168-179 ◽  
Author(s):  
K. Nedbalcova ◽  
P. Satran ◽  
Z. Jaglic ◽  
R. Ondriasova ◽  
Z. Kucerova
Keyword(s):  
Respiratory Tract ◽  
Clinical Symptoms ◽  
Animal Husbandry ◽  
Haemophilus Parasuis ◽  
Upper Respiratory Tract ◽  
Virulent Strains ◽  
Upper Respiratory ◽  
High Doses ◽  
The Brain ◽  
Very High

Haemophilus parasuis is a common epiphyte of the upper respiratory tract of pigs. The factors of H. parasuis pathogenicity that enable some strains to be virulent and consequently cause a clinical disease have not been established yet. Fifteen serovars of H. parasuis have been described at present. Individual serovars differ in virulence, and considerable differences in virulence also exist within each serovar. Virulent strains can particularly participate as microorganisms secondary to pneumonia, cause septicaemia without polyserositis or Glässer’s disease characterized by polyserositis, pericarditis, arthritis and meningitis. Clinical symptoms of this disease are highly variable. Therefore, culture detection of causative agent, particularly from the brain, joints and polyserositis is an essential diagnostic tool. The disease caused by H. parasuis can be treated with antibiotics; however, oral or parenteral administration of very high doses of antibiotics is necessary. The level of animal hygiene and animal husbandry are important factors for prevention of this disease. Commercial or autogenous vaccines can be used in the immunoprophylaxis of pre-parturient sows and their progeny after weaning. For the production of autogenous vaccines, it is most effective to use isolates from animals with lesions present in CNS. Isolates recovered from arthritic and systemic sites of infection are less suitable and isolates recovered from lungs are not suitable at all because of their heterogeneity.

scholarly journals Haemophilus parasuis VtaA2 is involved in adhesion to extracellular proteins

2019 ◽  
Vol 50 (1) ◽  
Author(s):  
Mar Costa-Hurtado ◽  
Laura Garcia-Rodriguez ◽  
Sergi Lopez-Serrano ◽  
Virginia Aragon
Keyword(s):  
Respiratory Tract ◽  
Systemic Disease ◽  
Extracellular Proteins ◽  
In Vitro Assays ◽  
Haemophilus Parasuis ◽  
Upper Respiratory Tract ◽  
Passenger Domain ◽  
Virulent Strains ◽  
Upper Respiratory

Abstract Haemophilus parasuis is part of the microbiota of the upper respiratory tract in swine. However, virulent strains can cause a systemic disease known as Glässer’s disease. Several virulence factors have been described in H. parasuis including the virulence-associated trimeric autotransporters (VtaAs). VtaA2 is up-regulated during infection and is only found in virulent strains. In order to determine its biological function, the vtaA2 gene was cloned with its native promotor region in pACYC184, and the transformed Escherichia coli was used to perform functional in vitro assays. VtaA2 was found to have a role in attachment to plastic, mucin, BSA, fibronectin and collagen. As other VtaAs from H. parasuis, the passenger domain of VtaA2 contains collagen domains. In order to examine the contribution of the collagen repeats to VtaA2 function, a recombinant vtaA2 without the central collagen domains was obtained and named vtaA2OL. VtaA2OL showed similar capacity than VtaA2 to adhere to plastic, mucin, BSA, fibronectin and plasma but a reduced capacity to adhere to collagen, suggesting that the collagen domains of VtaA2 are involved in collagen attachment. No function in cell adhesion and invasion to epithelial alveolar cell line A549 or unspecific binding to primary alveolar macrophages was found. Likewise VtaA2 had no role in serum or phagocytosis resistance. We propose that VtaA2 mediates adherence to the host by binding to the mucin, found in the upper respiratory tract mucus, and to the extracellular matrix proteins, present in the connective tissue of systemic sites, such as the serosa.

Otorhinolaryngological manifestations of COVID-19

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Jarosław Wysocki
Keyword(s):  
Respiratory Tract ◽  
Distress Syndrome ◽  
Clinical Symptoms ◽  
Wide Spectrum ◽  
Multiple Organ ◽  
Upper Respiratory Tract ◽  
Equilibrium System ◽  
Similar Frequency ◽  
Upper Respiratory ◽  
Loss Of Strength

COVID-19 manifests itself in a wide spectrum of clinical symptoms, both in terms of their variety and severity. It can be asymptomatic or abortive, mild, moderate, severe and lightning, as septic with multiple organ failure and shock Typical leading symptoms of COVID-19 are: high fever poorly responding to drugs, severe loss of strength, chest pain, dyspnoea, pain headaches, bone and joint pain and muscle pain, until the onset of acute respiratory distress syndrome (ARDS). However, many publications mention among the possible symptoms also others, not related to the involvement of the lower respiratory tract. These are gastrointestinal disorders, damage to the central and peripheral nervous system, catarrh of the upper respiratory tract and dysfunctions of the sensory organs. The aim of this literature review was to determine the frequency of various head and neck dysfunctions that are part of COVID-19. Symptoms of conjunctivitis, nasal mucosa, pharynx and larynx are reported by about of patients, but they do not always occur at the same time, as in infections caused, for example, by rhinoviruses. Anosmi / hyposmia or ageusia / hypogeusia occur with a similar frequency. Symptoms of damage to the equilibrium system, such as dizziness, are reported by approx. 1/3, vertigo and hearing loss approx. 5-6%, tinnitus approx. 10% of patients. Reports of coexistence with COVID-19 of peripheral paresis of the facial nerve are so far relatively few and often included in the neurological disorders, the frequency of which is also about 1/3 of COVID-19 cases. Importantly, both catarrhal symptoms and the others listed here may precede, co-occur or follow the appearance of the leading symptoms of COVID-19. They can also be the only symptoms of this disease. This should prompt otorhinolaryngologists to be particularly vigilant in this regard

Ciliary Ultrastructure and Mucociliary Transport in Upper Respiratory Tract Infections

1994 ◽  
Vol 8 (5) ◽  
pp. 211-216 ◽  
Author(s):  
Tommi Torkkeli ◽  
Markus Rautiainen ◽  
Juhani Nuutinen
Keyword(s):  
Respiratory Tract ◽  
Respiratory Tract Infections ◽  
Clinical Symptoms ◽  
Upper Respiratory Tract Infections ◽  
Mucociliary Transport ◽  
Upper Respiratory Tract ◽  
Severe Infections ◽  
Upper Respiratory ◽  
Tract Infections ◽  
Ciliary Ultrastructure

The ciliary ultrastructure in transmission electron microscopy and nasal mucociliary transport rate (MTR) by a radioisotopic method were studied in 50 patients with longstanding upper respiratory tract infections. The clinical symptoms correlated well with MTR. The symptoms in patients with MTR 3 mm/min or better were mild, but the patients with poor MTR (less than 3 mm/min) suffered from recurrent or severe infections. The completely normal ultrastructural findings were found only in patients with MTR better than 3 mm/min. All the patients with poor MTR had pathological ciliary ultrastructure, with numerous tubular anomalies and disorientation of ciliary beat direction. The outer dynein arms were found to be short in 16% of cases with poor MTR.

scholarly journals Predicting Disease Severity and Viral Spread of H5N1 Influenza Virus in Ferrets in the Context of Natural Exposure Routes

2015 ◽  
Vol 90 (4) ◽  
pp. 1888-1897 ◽  
Author(s):  
Kathryn M. Edenborough ◽  
Suzanne Lowther ◽  
Karen Laurie ◽  
Manabu Yamada ◽  
Fenella Long ◽  
...  
Keyword(s):  
Influenza Virus ◽  
Respiratory Tract ◽  
Disease Severity ◽  
Severe Disease ◽  
Upper Respiratory Tract ◽  
H5n1 Influenza Virus ◽  
Viral Spread ◽  
H5n1 Influenza ◽  
Upper Respiratory ◽  
The Brain

ABSTRACTAlthough avian H5N1 influenza virus has yet to develop the capacity for human-to-human spread, the severity of the rare cases of human infection has warranted intensive follow-up of potentially exposed individuals that may require antiviral prophylaxis. For countries where antiviral drugs are limited, the World Health Organization (WHO) has developed a risk categorization for different levels of exposure to environmental, poultry, or human sources of infection. While these take into account the infection source, they do not account for the likely mode of virus entry that the individual may have experienced from that source and how this could affect the disease outcome. Knowledge of the kinetics and spread of virus after natural routes of exposure may further inform the risk of infection, as well as the likely disease severity. Using the ferret model of H5N1 infection, we compared the commonly used but artificial inoculation method that saturates the total respiratory tract (TRT) with virus to upper respiratory tract (URT) and oral routes of delivery, those likely to be encountered by humans in nature. We show that there was no statistically significant difference in survival rate with the different routes of infection, but the disease characteristics were somewhat different. Following URT infection, viral spread to systemic organs was comparatively delayed and more focal than after TRT infection. By both routes, severe disease was associated with early viremia and central nervous system infection. After oral exposure to the virus, mild infections were common suggesting consumption of virus-contaminated liquids may be associated with seroconversion in the absence of severe disease.IMPORTANCERisks for human H5N1 infection include direct contact with infected birds and frequenting contaminated environments. We used H5N1 ferret infection models to show that breathing in the virus was more likely to produce clinical infection than swallowing contaminated liquid. We also showed that virus could spread from the respiratory tract to the brain, which was associated with end-stage disease, and very early viremia provided a marker for this. With upper respiratory tract exposure, infection of the brain was common but hard to detect, suggesting that human neurological infections might be typically undetected at autopsy. However, viral spread to systemic sites was slower after exposure to virus by this route than when virus was additionally delivered to the lungs, providing a better therapeutic window. In addition to exposure history, early parameters of infection, such as viremia, could help prioritize antiviral treatments for patients most at risk of succumbing to infection.

scholarly journals Epiglottic retroversion in nine dogs

2020 ◽  
Vol 89 (3) ◽  
pp. 152-158
Author(s):  
K. Van Ginneken ◽  
B. Van Goethem ◽  
N. Devriendt ◽  
T. Bosmans ◽  
H. De Rooster
Keyword(s):  
Surgical Technique ◽  
Respiratory Tract ◽  
Clinical Improvement ◽  
Clinical Symptoms ◽  
Exercise Intolerance ◽  
Respiratory Disorder ◽  
Upper Respiratory Tract ◽  
Long Term Outcome ◽  
Laryngeal Paralysis ◽  
Upper Respiratory

Epiglottic retroversion (ER) is an uncommon and poorly understood disorder of the upper respiratory tract in small breed dogs. In this retrospective study, perioperative characteristics, surgical technique, outcome, and complications in nine dogs that underwent surgical treatment for ER and/or concurrent upper respiratory tract disorders, were evaluated. The most frequently reported clinical symptoms were chronic intermittent inspiratory stridor (89%), exercise intolerance (78%), and dyspnea (67%). Concurrent respiratory disorders were highly prevalent (78%). Five dogs initially underwent a temporary epiglottopexy and two a permanent epiglottopexy. In two dogs, both suffering from concurrent laryngeal paralysis, only a unilateral cricoarytenoid lateralization was performed. After initial clinical improvement, temporary and permanent epiglottopexy eventually failed in 4/6 dogs (67%) that were available for follow-up, necessitating partial epiglottectomy as revision surgery. This resulted in a successful long-term outcome in 5/6 of these dogs (83%). In the dogs with primary ER or in cases where the presence of secondary ER led to significant respiratory symptoms, partial epiglottectomy as a primary surgical technique appeared to be a more permanent treatment option than epiglottopexy. Both dogs with surgically corrected concurrent laryngeal paralysis without epiglottopexy or epiglottectomy showed clinical improvement. This might indicate that, in case of secondary ER, positive results can be achieved after management of the underlying respiratory disorder.

scholarly journals Experimental infection of specific-pathogen-free domestic lambs with Mycoplasma ovipneumoniae causes asymptomatic colonization of the upper airways that is resistant to antibiotic treatment

2021 ◽  
Author(s):  
Thea Johnson ◽  
Kerri Jones ◽  
Bryan Tegner Jacobson ◽  
Julia Schaerer ◽  
Cassie Mosdal ◽  
...  
Keyword(s):  
Respiratory Tract ◽  
Antibiotic Treatment ◽  
Clinical Symptoms ◽  
Respiratory Pathogen ◽  
Domestic Sheep ◽  
Upper Respiratory Tract ◽  
Specific Pathogen Free ◽  
Specific Pathogen ◽  
Upper Respiratory ◽  
Mycoplasma Ovipneumoniae

Mycoplasma ovipneumoniae (M. ovipneumoniae) is a respiratory pathogen associated with the development of mild to moderate respiratory disease in domestic lambs and severe pneumonia outbreaks in wild ruminants such as bighorn sheep. However, whether M. ovipneumoniae by itself causes clinical respiratory disease in domestic sheep in the absence of secondary bacterial pathogens is still a matter of debate. The goal of our study was to better understand the role of M. ovipneumoniae as a respiratory pathogen in domestic sheep and to explore potential antibiotic treatment approaches. Therefore, we inoculated four-month-old, specific-pathogen-free lambs with field isolates of M. ovipneumoniae and monitored the lambs for eight weeks for colonization with the bacteria, M. ovipneumoniae-specific antibodies, clinical symptoms, and cellular and molecular correlates of lung inflammation. After eight weeks, lambs were treated with the macrolide antibiotic gamithromycin and observed for an additional four weeks. Stable colonization of the upper respiratory tract with M. ovipneumoniae was established in all four M. ovipneumoniae-inoculated, but in none of the four mock-infected lambs. All M. ovipneumoniae-infected lambs developed a robust antibody response to M. ovipneumoniae within 2 weeks. However, we did not observe significant clinical symptoms or evidence of lung damage or inflammation in any of the infected lambs. Interestingly, treatment with gamithromycin failed to reduce M. ovipneumoniae colonization. These observations indicate that, in the absence of co-factors, M. ovipneumoniae causes asymptomatic colonization of the upper respiratory tract of that is resistant to clearance by the host immune response as well as by gamithromycin treatment in domestic lambs.

Relation of diseases of the nervous system to diseases of the upper respiratory tract

1927 ◽  
Vol 23 (4) ◽  
pp. 473-473
Author(s):  
M. F. Tsytovich
Keyword(s):  
Nervous System ◽  
Infectious Diseases ◽  
Respiratory Tract ◽  
Cranial Nerves ◽  
Upper Respiratory Tract ◽  
Upper Respiratory ◽  
Nutritional Disturbances ◽  
Almost All ◽  
The Brain

Noting that diseases of the cranial nervous system may result from 1) infection, 2) nutritional disturbances, and 3) disturbances of normal stimuli (reflexes), the author points out that a huge percentage of infectious diseases of the brain and the meninges have their source in the nose and its appendage cavities. Almost all cranial nerves can also be infected from the nose and its appendages.

Acromegaly—the mucosal changes within the nose and paranasal sinuses

1988 ◽  
Vol 102 (12) ◽  
pp. 1107-1110 ◽  
Author(s):  
D. W. Skinner ◽  
S. H. Richards
Keyword(s):  
Respiratory Tract ◽  
Paranasal Sinuses ◽  
Upper Respiratory Tract ◽  
High Incidence ◽  
Mucosal Changes ◽  
Upper Respiratory ◽  
Nose And Paranasal Sinuses ◽  
Upper Respiratory Tract Obstruction ◽  
Very High ◽  
Mucosal Hypertrophy

The presence of upper respiratory tract obstruction in patients with acromegaly has been described. The main sites for obstruction were previously thought to be laryngeal and oropharyngeal. This reviews 65 patients with acromegaly and 27 patients with a prolactinoma treated by trans-ethmoidal hypophysectomy. The results confirmed a very high incidence of polyp formation and mucosal hypertrophy within both the sphenoid (88 per cent) and ethmoidal (62 per cent) sinuses of the acromegalic patients. The histological appearances of the mucosal hypertrophy and polyposis confirmed no specific features attributable to acromegaly. Patient age and serum H.G.H. level do not appear to be significance factors. These findings within the para-nasal sinuses have never previously been reported.

scholarly journals SARS-CoV-2 Detection in Fecal Sample from a Patient with Typical Findings of COVID-19 Pneumonia on CT but Negative to Multiple SARS-CoV-2 RT-PCR Tests on Oropharyngeal and Nasopharyngeal Swab Samples

Medicina ◽  
2021 ◽  
Vol 57 (3) ◽  
pp. 290
Author(s):  
Barbara Brogna ◽  
Carlo Brogna ◽  
Mauro Petrillo ◽  
Adriana Modestina Conte ◽  
Giulio Benincasa ◽  
...  
Keyword(s):  
Respiratory Tract ◽  
Clinical Symptoms ◽  
Nasopharyngeal Swab ◽  
Upper Respiratory Tract ◽  
Rt Pcr ◽  
Chain Reaction ◽  
Negative Results ◽  
Upper Respiratory ◽  
Polymerase Chain ◽  
Pcr Test

Reverse transcriptase polymerase chain reaction (RT-PCR) negative results in the upper respiratory tract represent a major concern for the clinical management of coronavirus disease 2019 (COVID-19) patients. Herein, we report the case of a 43-years-old man with a strong clinical suspicion of COVID-19, who resulted in being negative to multiple severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) RT-PCR tests performed on different oropharyngeal and nasopharyngeal swabs, despite serology having confirmed the presence of SARS-CoV-2 IgM. The patient underwent a chest computed tomography (CT) that showed typical imaging findings of COVID-19 pneumonia. The presence of viral SARS-CoV-2 was confirmed only by performing a SARS-CoV-2 RT-PCR test on stool. Performing of SARS-CoV-2 RT-PCR test on fecal samples can be a rapid and useful approach to confirm COVID-19 diagnosis in cases where there is an apparent discrepancy between COVID-19 clinical symptoms coupled with chest CT and SARS-CoV-2 RT-PCR tests’ results on samples from the upper respiratory tract.

scholarly journals Features of clinical manifestations and complications of acute respiratory infections in children

2019 ◽  
pp. 95-99
Author(s):  
E. Р. Merkulova
Keyword(s):  
Respiratory Tract ◽  
Respiratory Tract Infections ◽  
Clinical Symptoms ◽  
Respiratory Infections ◽  
Clinical Manifestations ◽  
Upper Respiratory Tract ◽  
Suppurative Otitis Media ◽  
Paediatric Practice ◽  
Upper Respiratory ◽  
Tract Infections

The article presents data on the prevalence of upper respiratory tract infections in paediatric practice. The following complications may pose health risks: sinusitis, acute suppurative otitis media and chronic tonsillitis. The authors provide statistical data on the prevalence of these complications, a multivariate analysis of the clinical symptoms of the diseases, the main symptoms of which are temperature reaction, leucocytosis, regenerative left shift, increased ESR. Special attention is paid to the choice of antipyretic agents that affect not only the fever, but also the inflammatory reaction of the upper respiratory tract mucosa, which may quickly ease the symptoms of the disease.

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