نتایج جستجو برای: Avian influenza virus H7N1

تعداد نتایج: 459671  

A. Nunez H. Nili, I. H. Brown J. Banks S. Essen

Most highly pathogenic avian influenza viruses (AIV) emerge after field passage of non-pathogenic AIVs in birds. The outbreak of low-pathogenic H7N1 avian influenza virus in Italy during 1999-2000 followed by outbreak of highly pathogenic H7N1 avian influenza virus is one example in this regard. This experiment has been designed to investigate the effect of pre-infection of birds with LPAI on s...

Journal: :iranian journal of veterinary research 2008
h. nili s. essen a. nunez j. banks i. h. brown

most highly pathogenic avian influenza viruses (aiv) emerge after field passage of non-pathogenic aivs in birds. the outbreak of low-pathogenic h7n1 avian influenza virus in italy during 1999-2000 followed by outbreak of highly pathogenic h7n1 avian influenza virus is one example in this regard. this experiment has been designed to investigate the effect of pre-infection of birds with lpai on s...

Journal: :iranian journal of veterinary research 2008
h. nili a. mcnally e. aldous a. nunez j. banks

following experimental inoculation of 3-week-old turkeys with different titres (106, 104, 103, 102 and 101 egg infectious dose (eid50)) of a/ostrich/italy/984/2000 h7n1 highly pathogenic avian influenza virus (hpaiv), the selected tissues and organs were examined for pathological changes. tissue samples from different organs that obtained from dead and sacrificed birds were fixed in 10% neutral...

Journal: :Applied and environmental microbiology 2012
Josefine Elving Eva Emmoth Ann Albihn Björn Vinnerås Jakob Ottoson

Effective sanitization is important in viral epizootic outbreaks to avoid further spread of the pathogen. This study examined thermal inactivation as a sanitizing treatment for manure inoculated with highly pathogenic avian influenza virus H7N1 and bacteriophages MS2 and 6. Rapid inactivation of highly pathogenic avian influenza virus H7N1 was achieved at both mesophilic (35°C) and thermophilic...

Journal: :Journal of virology 2010
Sébastien M Soubies Christelle Volmer Guillaume Croville Josianne Loupias Brigitte Peralta Pierrette Costes Caroline Lacroux Jean-Luc Guérin Romain Volmer

Large-scale sequence analyses of influenza viruses revealed that nonstructural 1 (NS1) proteins from avian influenza viruses have a conserved C-terminal ESEV amino acid motif, while NS1 proteins from typical human influenza viruses have a C-terminal RSKV motif. To test the influence of the C-terminal domains of NS1 on the virulence of an avian influenza virus, we generated a wild-type H7N1 viru...

Journal: :Journal of virology 2016
El-Sayed M Abdelwhab Jutta Veits Kerstin Tauscher Mario Ziller Jens P Teifke Jürgen Stech Thomas C Mettenleiter

UNLABELLED In 1999, after circulation for a few months in poultry in Italy, low-pathogenic (LP) avian influenza (AI) H7N1 virus mutated into a highly pathogenic (HP) form by acquisition of a unique multibasic cleavage site (mCS), PEIPKGSRVRR*GLF (asterisk indicates the cleavage site), in the hemagglutinin (HA) and additional alterations with hitherto unknown biological function. To elucidate th...

2012
Roberto A. Saenz Steve C. Essen Sharon M. Brookes Munir Iqbal James L. N. Wood Bryan T. Grenfell John W. McCauley Ian H. Brown Julia R. Gog

Outbreaks of avian influenza in poultry can be devastating, yet many of the basic epidemiological parameters have not been accurately characterised. In 1999-2000 in Northern Italy, outbreaks of H7N1 low pathogenicity avian influenza virus (LPAI) were followed by the emergence of H7N1 highly pathogenic avian influenza virus (HPAI). This study investigates the transmission dynamics in turkeys of ...

Journal: :archives of razi institute 2016
r. nisi m.j. mehrabanpour a. toffan

in this study, the pathogenicity of a/ch/it/5093/1999 h7n1 which had been isolated from chicken during the outbreak in italy was assessed in chicken by experimental infection virus. ten spf chickens of four week-old were inoculated with this virus, and five chickens were inoculated with uninfected allantoic fluid. for determination of virus shedding, oropharyngeal and cloacal swabs were taken f...

2016
Hongmei Jin Deli Wang Jing Sun Yanfang Cui Guang Chen Xiaolin Zhang Jiajie Zhang Xiang Li Hongliang Chai Yuwei Gao Yanbing Li Yuping Hua

The emergence of human infections with a novel H7N9 influenza strain has raised global concerns about a potential human pandemic. To further understand the character of other influenza viruses of the H7 subtype, we selected two H7N1 avian influenza viruses (AIVs) isolated from wild birds during routine surveillance in China: A/Baer's Pochard/Hunan/414/2010 (BP/HuN/414/10) (H7N1) and A/Common Po...

Journal: :The Journal of infectious diseases 2005
Simona Puzelli Livia Di Trani Concetta Fabiani Laura Campitelli Maria Alessandra De Marco Ilaria Capua Jean Francois Aguilera Maria Zambon Isabella Donatelli

We evaluated the potential for avian-to-human transmission of low pathogenic avian influenza (LPAI) and highly pathogenic avian influenza (HPAI) H7N1 and LPAI H7N3 viruses that were responsible for several outbreaks of influenza in poultry in Italy between 1999 and 2003. A serological survey of poultry workers was conducted by use of a combination of methods. Evidence of anti-H7 antibodies was ...

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