Abstract
A new metallo-β-lactamase, designated NDM-1, is originating from New Delhi and first reported in 2009 in India. NDM-1 carrying bacteria can resist all β-lactams except aztreonam. NDM-1 genes were found mostly in E. coli and K. pneumonia, and raid disseminated to other 11 species bacteria in the environment. Some of the bacteria can transfer NDM-1 gene by conjugation.
In China, NDM-1 gene was already identified on a plasmid in Acinetobacter lwoffii of chicken origin. Birds were also improved to carry and spread multidrug-resistant bacteria. Migratory birds may be considered to be a way bringing this drug-resistant gene to Taiwan. We choose loop-mediated isothermal amplification (LAMP) for the rapid detection of NDM-1 gene from feces of wild birds sampling from wet land of Taiwan. So far, all 1458 faecal samples were negative for NDM-1 gene.
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Abstract
An H5N2 influenza virus (A/CK/Penghu/121103/2012) was isolated from native broiler reared in Penghu County in November 2012. The intravenous pathogenicity index of the isolate was higher than 1.2, indicating that the virus was high pathogenicity in chickens. The amino acid sequence in cleavage site of haemagglutinin (HA) was PQREKR/GLF. According to our knowledge, highly pathogenic avian influenza virus (HPAI) with 3 basic amino acid in HA cleavage site wasn’t found in OIE website. In this study, the histological lesions and the distribution of vial antigens in SPF chickens inoculated intravenously with this isolate were compared to other three isolates of low pathogenic avian influenza (LPAI) bearing 3 basic amino acid in HA cleavage site (A/CK/Chiayi/A2628/2012, A/CK/Penghu/A2721/2012 and A/Gamecock/Miaoli/121203/2012). Histologically, renal tubule necrosis and lymphocytic nephritis were presented in chickens inoculated with LPAI viruses. Furthermore, myocardial necrosis, renal tubule necrosis and lymphocytic nephritis, and pancreatic necrosis were presented in HPAI inoculated chickens. Immunohistochemically, influenza virus antigens were detected in kidney, spleen, pancreas, heart, and endothelium in HPAI inoculated chickens. However, viral antigens were detected only in kidney of LPAI inoculated chickens. These results confirmed that A/CK/Penghu/121103/2012 viral strain exhibited features of high pathogenicity, such as viral antigen presented in multi-organs, especially in endothelium.
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