41. This single amino acid change in the NS1 gene greatly increased the pathogenicity of the H5N1 influenza virus. 42. It was first isolated around breeding galleries of vascular wilt pathogenicity on " Ulmus procera ". 43. The pathogenicity of the EGFR mutation was supported by in vitro experiments and functional analysis of a skin biopsy. 44. One of the special things about this particular model is that it has two strains with vastly different pathogenicity . 45. When ( p ) ppGpp is absent, pathogenicity is compromised for reasons that vary with the organism studied. 46. It is not currently known if the strain in the British Columbia outbreak is a low or high pathogenicity form. 47. This mouse model of human poliovirus infection has proven to be an invaluable tool in understanding poliovirus biology and pathogenicity . 48. It has low pathogenicity in humans, and where infections have been found they are closely associated with immunocompromised individuals. 49. Results reported by Webster in July 2005 reveal further progression toward pathogenicity in mice and longer virus shedding by ducks. 50. However, the pathogenicity of " M . perstans " infection has been recently reconsidered in various studies.
