نتایج جستجو برای: h7n1
تعداد نتایج: 134 فیلتر نتایج به سال:
Abstract Despite the success in development of antiviral drugs, a need continues to exist for effective therapies for viral infections. Proteinase inhibitors of microbial origin could be used successfully as antiviral agents. The virus-inhibitory activity of a fermentation product, produced by Streptomyces sp. 225b (SS 225) was studied with respect to the specificity and selectivity of inhibiti...
The recently identified human infections with avian influenza A(H7N9) viruses in China raise important questions regarding possible source and risk to humans. Sequence comparison with an influenza A(H7N7) outbreak in the Netherlands in 2003 and an A(H7N1) epidemic in Italy in 1999–2000 suggests that widespread circulation of A(H7N9) viruses must have occurred in China. The emergence of human ad...
A deletion of ∼20 amino acids in the stalk of neuraminidase is frequently observed upon transmission of influenza A viruses from waterfowl to domestic poultry. A pair of recombinant H7N1 viruses bearing either a short- or long-stalk neuraminidase was genetically engineered. Inoculation of the long-stalk-neuraminidase virus resulted in a higher cloacal excretion in ducks and led conversely to lo...
Influenza A virus poses a serious threat towards public health globally. Its genome encodes a nucleoprotein (NP) (498-amino acid) which plays a vital role in viral RNA replication and host specificity. Homology modelling was used to generate the 3-D structure of four different strains (H5N1, H6N1, H3N2 and H7N1) using a known protein template crystal structure (PDB code No. 2IQH). The validatio...
Influenza A virus (IAV) causes central nervous system (CNS) lesions in avian and mammalian species, including humans. However, the mechanism used by IAV to invade the brain has not been determined. In the current work, we used chickens infected with a highly pathogenic avian influenza (HPAI) virus as a model to elucidate the mechanism of entry of IAV into the brain. The permeability of the BBB ...
BACKGROUND Avian influenza (AI) caused by H7 AI viruses (AIVs) of both low pathogenicity (LP) and high pathogenicity (HP) are notifiable poultry diseases. OBJECTIVES Design and validate two RealTime reverse transcriptase polymerase chain reactions (RRT PCRs) for Eurasian H7 AIV detection and pathotyping. METHODS The H7 RRT PCRs amplified within the (i) HA2 and (ii) cleavage site CS regions ...
This experiment aims to demonstrate the efficacy of ceramic powder derived from various sources to inactivate avian influenza virus and its possibility to use in the environment. The ceramics used in the present experiment were derived from chicken feces (CF), scallop shell (SS), polyvinyl chloride (PVC) and soybean (SB). All ceramics were mixed with low pathogenic AIV (LPAIV) H7N1, and then ke...
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