scholarly journals Bats and Coronaviruses

Viruses ◽  
2019 ◽  
Vol 11 (1) ◽  
pp. 41 ◽  
Author(s):  
Arinjay Banerjee ◽  
Kirsten Kulcsar ◽  
Vikram Misra ◽  
Matthew Frieman ◽  
Karen Mossman
Keyword(s):  
Severe Acute Respiratory Syndrome ◽  
Acute Diarrhea ◽  
Severe Disease ◽  
Clinical Signs ◽  
Emerging Viruses ◽  
Future Studies ◽  
Porcine Epidemic Diarrhea ◽  
Serious Disease ◽  
Multiple Strains ◽  
Diarrhea Syndrome

Bats are speculated to be reservoirs of several emerging viruses including coronaviruses (CoVs) that cause serious disease in humans and agricultural animals. These include CoVs that cause severe acute respiratory syndrome (SARS), Middle East respiratory syndrome (MERS), porcine epidemic diarrhea (PED) and severe acute diarrhea syndrome (SADS). Bats that are naturally infected or experimentally infected do not demonstrate clinical signs of disease. These observations have allowed researchers to speculate that bats are the likely reservoirs or ancestral hosts for several CoVs. In this review, we follow the CoV outbreaks that are speculated to have originated in bats. We review studies that have allowed researchers to identify unique adaptation in bats that may allow them to harbor CoVs without severe disease. We speculate about future studies that are critical to identify how bats can harbor multiple strains of CoVs and factors that enable these viruses to “jump” from bats to other mammals. We hope that this review will enable readers to identify gaps in knowledge that currently exist and initiate a dialogue amongst bat researchers to share resources to overcome present limitations.

scholarly journals The Broad Range of Coronaviruses Co-existing in Chiropteran: Implications for One Health

2021 ◽  
Vol 11 (2) ◽  
pp. 170-180
Author(s):  
D. Katterine Bonilla-Aldana ◽  
Catalina Toro-Ortiz ◽  
Paula Jimenez-Salazar ◽  
Valeria Guevara-Manso ◽  
S. Daniela Jimenez-Diaz ◽  
...  
Keyword(s):  
Severe Acute Respiratory Syndrome ◽  
One Health ◽  
Animal Health ◽  
Clinical Manifestations ◽  
Zoonotic Diseases ◽  
Human Species ◽  
Porcine Epidemic Diarrhea ◽  
Diarrhea Disease ◽  
Diarrhea Syndrome ◽  
Different Parts

Bats are a group of mammals that harbor the most significant number of coronaviruses. The aim of present review article was to analyze the broad spectrum of the coronavirus coexisting in Chiropterans hosts. Bats have certain types of cell receptors that allow them to be the potential hosts of a large number of viruses without the presence of any clinical manifestations, and to be a source of contagion infections for other animals and human species. Emphasis can be placed on five coronaviruses, such as Porcine Epidemic Diarrhea Disease, Severe Acute Diarrhea Syndrome, Middle East Respiratory Syndrome, Severe Acute Respiratory Syndrome, and Severe Acute Respiratory Syndrome 2, which have had significant impacts causing epidemic outbreaks in different parts of the world, and generating implications for both human and animal health. In conclusion, recent research indicated the importance of bats as potential hosts of multiple coroaviruses leading to some zoonotic diseases.

scholarly journals 491. Aerosol-Generating Medical Procedures: Transmission of SARS-CoV-2 and Emerging Viruses

2020 ◽  
Vol 7 (Supplement_1) ◽  
pp. S312-S312
Author(s):  
Seth D Judson ◽  
Vincent J Munster
Keyword(s):  
High Risk ◽  
Severe Disease ◽  
Experimental Studies ◽  
Virus Transmission ◽  
Nosocomial Transmission ◽  
Medical Procedures ◽  
Emerging Viruses ◽  
Zoonotic Viruses ◽  
Increased Risk ◽  
Hospital Acquired

Abstract Background During the pandemic of coronavirus disease 2019 (COVID-19), many questions arose regarding risks for hospital-acquired or nosocomial transmission of severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Aerosol generating medical procedures (AGMPs), techniques that can generate infectious, virus-laden aerosols, could potentially amplify transmission among healthcare workers (HCWs). Thus, it was widely recommended that HCWs use airborne precautions when performing AGMPs. However, in clinical settings it is often unclear what procedures constitute AGMPs and how the risk varies by procedure or pathogen. We set out to further define AGMPs and assess the risk for nosocomial transmission of SARS-CoV-2 and other high-risk viruses via AGMPs. Methods We identified potential AGMPs and emerging viruses that were high-risk for nosocomial transmission through reviewing experimental and clinical data. Potential AGMPs were those associated with previous virus transmission or mechanically capable of transmission. High-risk viruses were defined as those that cause severe disease in humans for which limited therapies or interventions exist, are infectious via aerosols in humans or non-human primates (NHPs), found in the respiratory tract of infected humans or NHPs, and had previous evidence of nosocomial transmission. Results We identified multiple potential AGMPs, which could be divided into those that generate aerosols or induce a patient to form aerosols, as well as eight families of high-risk viruses. All of the viruses were emerging zoonotic RNA viruses. In the family Coronaviridae, we identified potential evidence for SARS-CoV-1, MERS-CoV, and SARS-CoV-2 transmission via AGMPs. SARS-CoV-1 and SARS-CoV-2 were also found to be similarly stable when aerosolized. Conclusion Multiple emerging zoonotic viruses pose a high risk for nosocomial transmission through a variety of AGMPs. Given the similar stability of SARS-CoV-2 with SARS-CoV-1 when aerosolized and prior nosocomial transmission of SARS-CoV-1 via AGMPs, we suspect that certain AGMPs pose an increased risk for SARS-CoV-2 transmission. Additional experimental studies and on-site clinical sampling during AGMPs are necessary to further risk stratify AGMPs. Disclosures All Authors: No reported disclosures

scholarly journals Experimental infection of indigenous North African goats with goatpox virus

2021 ◽  
Vol 63 (1) ◽  
Author(s):  
Jihane Hamdi ◽  
Zahra Bamouh ◽  
Mohammed Jazouli ◽  
Meryem Alhyane ◽  
Najet Safini ◽  
...  
Keyword(s):  
Antibody Response ◽  
Experimental Infection ◽  
Subcutaneous Tissue ◽  
Severe Disease ◽  
Clinical Signs ◽  
Economic Losses ◽  
North African ◽  
Cutaneous Lesions ◽  
Viral Dna ◽  
Goatpox Virus

Abstract Background Goatpox is a viral disease caused by infection with goatpox virus (GTPV) of the genus Capripoxvirus, Poxviridae family. Capripoxviruses cause serious disease to livestock and contribute to huge economic losses. Goatpox and sheeppox are endemic to Africa, particularly north of the Equator, the Middle East and many parts of Asia. GTPV and sheeppox virus are considered host-specific; however, both strains can cause clinical disease in either goats or sheep with more severe disease in the homologous species and mild or sub-clinical infection in the other. Goatpox has never been reported in Morocco, Algeria or Tunisia despite the huge population of goats living in proximity with sheep in those countries. To evaluate the susceptibility and pathogenicity of indigenous North African goats to GTPV infection, we experimentally inoculated eight locally bred goats with a virulent Vietnamese isolate of GTPV. Two uninfected goats were kept as controls. Clinical examination was carried out daily and blood was sampled for virology and for investigating the antibody response. After necropsy, tissues were collected and assessed for viral DNA using real-time PCR. Results Following the experimental infection, all inoculated goats displayed clinical signs characteristic of goatpox including varying degrees of hyperthermia, loss of appetite, inactivity and cutaneous lesions. The infection severely affected three of the infected animals while moderate to mild disease was noticed in the remaining goats. A high antibody response was developed. High viral DNA loads were detected in skin crusts and nodules, and subcutaneous tissue at the injection site with cycle threshold (Ct) values ranging from 14.6 to 22.9, while lower viral loads were found in liver and lung (Ct = 35.7 and 35.1). The results confirmed subcutaneous tropism of the virus. Conclusion Clinical signs of goatpox were reproduced in indigenous North African goats and confirmed a high susceptibility of the North African goat breed to GTPV infection. A clinical scoring system is proposed that can be applied in GTPV vaccine efficacy studies.

scholarly journals CD169/SIGLEC1 is expressed on circulating monocytes in COVID-19 and expression levels are associated with disease severity

Infection ◽  
2021 ◽  
Author(s):  
Jan-Moritz Doehn ◽  
Christoph Tabeling ◽  
Robert Biesen ◽  
Jacopo Saccomanno ◽  
Elena Madlung ◽  
...  
Keyword(s):  
Severe Acute Respiratory Syndrome ◽  
Disease Severity ◽  
Clinical Studies ◽  
Viral Infections ◽  
Severe Disease ◽  
Type I Interferons ◽  
Type I ◽  
Interferon Signaling ◽  
Expression Levels

AbstractCoronavirus disease 2019 (COVID-19) is caused by infection with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2). Type I interferons are important in the defense of viral infections. Recently, neutralizing IgG auto-antibodies against type I interferons were found in patients with severe COVID-19 infection. Here, we analyzed expression of CD169/SIGLEC1, a well described downstream molecule in interferon signaling, and found increased monocytic CD169/SIGLEC1 expression levels in patients with mild, acute COVID-19, compared to patients with severe disease. We recommend further clinical studies to evaluate the value of CD169/SIGLEC1 expression in patients with COVID-19 with or without auto-antibodies against type I interferons.

scholarly journals Treatment of Experimental Allergic Neuritis With Prednisolone

1987 ◽  
Vol 14 (1) ◽  
pp. 46-49 ◽  
Author(s):  
T.E. Feasby ◽  
J.J. Gilbert ◽  
A.F. Hahn ◽  
D.S. Lovgren
Keyword(s):  
Microscopic Examination ◽  
Severe Disease ◽  
Clinical Signs ◽  
Clinical Disease ◽  
Rapid Recovery ◽  
Experimental Allergic Neuritis ◽  
Nerve Roots ◽  
Lewis Rats ◽  
Experimental Allergic ◽  
Allergic Neuritis

Abstract:Experimental allergic neuritis (EAN) in Lewis rats was treated with prednisolone given prophylactically or therapeutically. Rats treated from the time of immunization with myelin or after the establishment of clinical disease improved more rapidly than controls. Treatment at the onset of clinical signs resulted in less severe disease and more rapid recovery. Rats treated just prior to the onset of clinical signs (day 10) did not develop significant clinical disease and appeared to have less inflammation in their nerves and nerve roots on microscopic examination.

scholarly journals Histopathology ofBordetella pertussisin the Baboon Model

2018 ◽  
Vol 86 (11) ◽  
Author(s):  
Lindsey I. Zimmerman ◽  
James F. Papin ◽  
Jason Warfel ◽  
Roman F. Wolf ◽  
Stanley D. Kosanke ◽  
...  
Keyword(s):  
Severe Disease ◽  
Clinical Signs ◽  
Human Infant ◽  
Mucus Production ◽  
Content Type ◽  
Age Related ◽  
Baboon Model ◽  
Relevant Animal Model ◽  
Significant Pathology ◽  
Conducting Airways

ABSTRACTPertussis is a severe respiratory disease caused byBordetella pertussis. The classic symptoms of pertussis include paroxysmal coughing with an inspiratory whoop, posttussive vomiting, cyanosis, and persistent coryzal symptoms. Infants under 2 months of age experience more severe disease, with most deaths occurring in this age group. Most of what is known about the pathology of pertussis in humans is from the evaluation of fatal human infant cases. The baboon model of pertussis provides the opportunity to evaluate the histopathology of severe but nonfatal pertussis. The baboon model recapitulates the characteristic clinical signs of pertussis observed in humans, including leukocytosis, paroxysmal coughing, mucus production, heavy colonization of the airway, and transmission of the bacteria between hosts. As in humans, baboons demonstrate age-related differences in clinical presentation, with younger animals experiencing more severe disease. We examined the histopathology of 5- to 6-week-old baboons, with the findings being similar to those reported for fatal human infant cases. In juvenile baboons, we found that the disease is highly inflammatory and concentrated to the lungs with signs of disease that would typically be diagnosed as acute respiratory distress syndrome (ARDS) and bronchopneumonia. In contrast, no significant pathology was observed in the trachea. Histopathological changes in the trachea were limited to cellular infiltrates and mucus production. Immunohistostaining revealed that the bacteria were localized to the surface of the ciliated epithelium in the conducting airways. Our observations provide important insights into the pathology of pertussis in typical, severe but nonfatal pertussis cases in a very relevant animal model.

scholarly journals Analysis of Virus Population Profiles within Pigs Infected with Virulent Classical Swine Fever Viruses: Evidence for Bottlenecks in Transmission but Absence of Tissue-Specific Virus Variants

2020 ◽  
Vol 94 (19) ◽  
Author(s):  
Camille Melissa Johnston ◽  
Ulrik Fahnøe ◽  
Louise Lohse ◽  
Jens Bukh ◽  
Graham J. Belsham ◽  
...  
Keyword(s):  
Classical Swine Fever Virus ◽  
Population Change ◽  
Virulent Strain ◽  
Severe Disease ◽  
Clinical Signs ◽  
Classical Swine Fever ◽  
Fever Virus ◽  
Host Cells ◽  
Virus Population ◽  
Highly Virulent

ABSTRACT Classical swine fever virus (CSFV) contains a specific motif within the E2 glycoprotein that differs between strains of different virulence. In the highly virulent CSFV strain Koslov, this motif comprises residues S763/L764 in the polyprotein. However, L763/P764 represent the predominant alleles in published CSFV genomes. In this study, changes were introduced into the CSFV strain Koslov (here called vKos_SL) to generate modified CSFVs with substitutions at residues 763 and/or 764 (vKos_LL, vKos_SP, and vKos_LP). The properties of these mutant viruses, in comparison to those of vKos_SL, were determined in pigs. Each of the viruses was virulent and induced typical clinical signs of CSF, but the vKos_LP strain produced them significantly earlier. Full-length CSFV cDNA amplicons (12.3 kb) derived from sera of infected pigs were deep sequenced and cloned to reveal the individual haplotypes that contributed to the single-nucleotide polymorphism (SNP) profiles observed in the virus population. The SNP profiles for vKos_SL and vKos_LL displayed low-level heterogeneity across the entire genome, whereas vKos_SP and vKos_LP displayed limited diversity with a few high-frequency SNPs. This indicated that vKos_SL and vKos_LL exhibited a higher level of fitness in the host and more stability at the consensus level, whereas several consensus changes were observed in the vKos_SP and vKos_LP sequences, pointing to adaptation. For each virus, only a subset of the variants present within the virus inoculums were maintained in the infected pigs. No clear tissue-dependent quasispecies differentiation occurred within inoculated pigs; however, clear evidence for transmission bottlenecks to contact animals was observed, with subsequent loss of sequence diversity. IMPORTANCE The surface-exposed E2 protein of classical swine fever virus is required for its interaction with host cells. A short motif within this protein varies between strains of different virulence. The importance of two particular amino acid residues in determining the properties of a highly virulent strain of the virus has been analyzed. Each of the different viruses tested proved highly virulent, but one of them produced earlier, but not more severe, disease. By analyzing the virus genomes present within infected pigs, it was found that the viruses which replicated within inoculated animals were only a subset of those within the virus inoculum. Furthermore, following contact transmission, it was shown that a very restricted set of viruses had transferred between animals. There were no significant differences in the virus populations present in various tissues of the infected animals. These results indicate mechanisms of virus population change during transmission between animals.

scholarly journals Infectious Diarrhea, a Public Health Problem in Population

2021 ◽  
Vol 4 (2) ◽  
pp. 01-04
Author(s):  
Deac Monica
Keyword(s):  
Public Health ◽  
Health Problem ◽  
Acute Diarrhea ◽  
Clinical Signs ◽  
Public Health Problem ◽  
Gastrointestinal Diseases ◽  
Public Health Issue ◽  
Diarrheal Diseases ◽  
Salmonella Spp ◽  
Diarrheal Illness

Infec­tious etiology in acute diarrhea, referred several gastrointestinal diseases, Most are gastroenteri­tis associated with clinical signs and symptoms including: nausea, vomiting, abdomi­nal pain and cramps, bloating, flatulence, fever, passage of bloody stools, tenesmus, and fecal ur­gency disorders. Diarrheal illness is a large worldwide public health problem, with substantial regional variation, in the prevalence of medical signs by being caused by specific pathogens. Infectious diarrheal diseases, are the second leading cause of morbidity and mortality worldwide and can cause real public health concerns. Such diarrhea was studied as a medical disorder, in a 3 years period, 2017 to 2020, in Transylvania a large region in Romania. It was found there, 3577 number of diarrheal diseases cases, appeared almost during July to August. The case incidence for the disease arrived at 65%, in the entire summer season. The cases data were transmitted by 12 district Sanitary Polices, to the Public Health Center Cluj. Cases were almost diagnosed by the family doctors of the region, in more then 50%. Few of this have need some days of hospitalization, because of several disease disorders, in which case it was used a specific adequate fluid and electrolyte replacement as key of the treatment, for managing diarrheal illnesses. Even so, 3 children under 5 years age died, because of severe complications. It was remarked so, organic failed who was estimate to be the cause of their deaths. Clinical and epidemiological evaluations were done and even defined the severity and type of this mentioned illnesses. The detected infectious etiology for the acute diarrheas, where determined in authorized Microbiology laboratories, where were identified: Shigella spp, Salmonella spp, Campylobacter spp, Yersinia spp, Rotavirus, Giardia. Most number of cases appeared in children, being suggestive in 63%, followed by elderly or adult people in 17% each. Acute diarrheal illness had to be considered a major public health issue, against which some determined control efforts are needed. Public health surveillance of infectious acute diarrhea, includes obligatory done strategies for a correct infection control.

scholarly journals Distorted TCR repertoires define multisystem inflammatory syndrome in children

2021 ◽  
Author(s):  
Amna Malik ◽  
Eszter N. Tóth ◽  
Michelle S. Teng ◽  
Jacob Hurst ◽  
Eleanor Watt ◽  
...  
Keyword(s):  
T Cell ◽  
Severe Acute Respiratory Syndrome ◽  
Severe Disease ◽  
Clinical Manifestations ◽  
High Confidence ◽  
T Cell Clones ◽  
Severity Of Disease ◽  
Cell Clones ◽  
Inflammatory Syndrome ◽  
Independent Expansion

While the majority of children infected with severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) display mild or no symptoms, rare individuals develop severe disease presenting with multisystem inflammatory syndrome (MIS-C). The reason for variable clinical manifestations is not understood. Here, we carried out TCR sequencing and conducted comparative analyses of TCR repertoires between children with severe (n=12) or mild (n=8) COVID-19. We compared these repertoires with unexposed individuals (samples collected pre-COVID-19 pandemic: n=8) and with the Adaptive Biotechnologies MIRA dataset, which includes over 135,000 high-confidence SARS-CoV-2-specific TCRs. We show that the repertoires of severely ill children are characterised by the expansion of TRBV11-2 chains with high junctional and CDR3 diversity. Moreover, the CDR3 sequences of TRBV11-2 clones shift away from SARS-CoV-2 specific T cell clones, resulting in distorted TCR repertoires. In conclusion, our study reports that CDR3-independent expansion of TRBV11-2+ cells, lacking SARS-CoV-2 specificity, defines severity of disease in children.

scholarly journals Identification of Pisum sativum Germ Plasm with Resistance to Root Rot Caused by Multiple Strains of Aphanomyces euteiches

Plant Disease ◽  
1999 ◽  
Vol 83 (1) ◽  
pp. 51-54 ◽  
Author(s):  
D. K. Malvick ◽  
J. A. Percich
Keyword(s):  
Pisum Sativum ◽  
Root Rot ◽  
Plant Introduction ◽  
Aphanomyces Euteiches ◽  
Sources Of Resistance ◽  
Breeding Programs ◽  
Pea Seedlings ◽  
Biomass Loss ◽  
Serious Disease ◽  
Multiple Strains

Aphanomyces root rot is a serious disease of pea (Pisum sativum), and additional sources of resistance are needed for development of disease-resistant cultivars. Accessions (n = 123) from the P. sativum Plant Introduction (PI) collection with the highest relative levels of resistance to one strain of Aphanomyces euteiches were previously identified from among approximately 2,500 accessions evaluated. The chosen 123 accessions were evaluated in this study for resistance to root rot caused by multiple strains of this pathogen. Five strains representing different US geographical locations and pathogenicity characteristics were used to evaluate pea seedlings in a greenhouse. Disease severity (DS) and percent loss of fresh biomass (inoculated vs. non-inoculated plants) were determined 15 days after inoculation. Significant differences (P = 0.05) in levels of DS and biomass loss (BL) occurred among the accessions after inoculation individually with the five strains. The relative rank of accessions based on DS and BL varied with the strain of A. euteiches used for inoculations. The 20 accessions with the lowest DS after inoculation with each strain were identified. Based on lowest DS, two accessions were among the 20 identified with all five individual strains, and four other accessions were among the 20 identified with four of the five strains. The results suggest that the P. sativum PI collection contains useful accessions for breeding programs aimed at developing pea varieties with resistance to A. euteiches.

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