نتایج جستجو برای: pathogenic viruses
تعداد نتایج: 160515 فیلتر نتایج به سال:
Wild-bird surveillance in North America for avian influenza (AI) viruses with a goal of early identification of the Asian H5N1 highly pathogenic AI virus has identified at least six low-pathogenicity H5N1 AI viruses between 2004 and 2006. The hemagglutinin (HA) and neuraminidase (NA) genes from all 6 H5N1 viruses and an additional 38 North American wild-bird-origin H5 subtype and 28 N1 subtype ...
Pathogenic properties of influenza A viruses introduced into embryonated chicken eggs via the allantoic cavity, the amniotic cavity or the yolk sac were studied using viruses with cleavable or non-cleavable haemagglutinin (HA), or reassortants derived from the highly pathogenic fowl plague virus (FPV) which has a cleavable HA. The various organs, membranes and fluids were analysed for virus yie...
BACKGROUND Avian influenza viruses have caused human infection and posed the pandemic potential. Live poultry markets are considered as a source of human infection with avian influenza viruses. Avian influenza routine surveillance of live poultry markets is taken annually in China. We isolated the 2 H11N9 influenza virus from the surveillance program. To better understand the risk caused by the...
We characterized low pathogenic avian influenza (LPAI) H5N2 and H9N2 viruses isolated in South Korea from 2008 to 2009. Genetic analysis of the H5N2 viruses isolated from wild birds and domestic ducks demonstrated that they were related to the recently isolated southern Chinese LPAI H5 viruses and various influenza viruses circulating in Eurasia. Three H9N2 viruses obtained at live bird markets...
Efficacy of oseltamivir therapy in ferrets inoculated with different clades of H5N1 influenza virus.
Highly pathogenic H5N1 influenza viruses have infected an increasing number of humans in Asia, with high mortality rates and the emergence of multiple distinguishable clades. It is not known whether antiviral drugs that are effective against contemporary human influenza viruses will be effective against systemically replicating viruses, such as these pathogens. Therefore, we evaluated the use o...
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...
Significance Viruses are seen as selfish pathogens that harm their hosts to ensure own survival. However, metagenomic studies drawing a new picture in which viruses present everywhere and not always associated diseases. A classic observation plant pathology is the outcome of infection depends on environmental conditions. Here, using experimental evolution, we show relationship between virus its...
Microbiota is a cluster of physiological and pathogenic microorganisms found in many tissues organs living things, including such as bacteria, viruses, fungi. has important roles on system functions immune system, urinary digestive system. However, these can cause obstruction the genital tract, epididymitis orchitis, thus may lead to infertility. In addition, apathogenic viruses fungi have nega...
We analyzed highly pathogenic avian influenza A(H5N1) viruses isolated from humans infected in Egypt during 2007-2011. All analyzed viruses evolved from the lineage of subtype H5N1 viruses introduced into Egypt in 2006; we found minimal evidence of reassortment and no exotic introductions. The hemagglutinin genes of the viruses from 2011 formed a monophyletic group within clade 2.2.1 that also ...
Highly pathogenic avian influenza (HPAI) H5N1 viruses are currently endemic in poultry in Egypt. Eradication of the viruses has been unsuccessful due to improper application of vaccine-based control strategies among other preventive measures. The viruses have evolved rapidly with increased bird-to-human transmission efficacy, thus affecting both animal and public health. Subsequent spread of po...
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