Investigation of suspected Newcastle disease (ND) outbreaks in Egypt uncovers a high virus velogenic ND virus burden in small-scale holdings and the presence of multiple pathogens
2019
AbstractHighly contagious
Newcastle disease(ND) is associated with devastating outbreaks with highly variable clinical signs among gallinaceous birds. In this study we aimed to verify clinical ND suspicions in poultry holdings in Egypt suffering from respiratory distress and elevated mortality, comparing two groups of ND-vaccinated poultry holdings in three
governorates. Besides testing for
Newcastle diseasevirus (NDV), samples were screened for infectious bronchits virus (IBV) and avian influenza virus (AIV) by RT-qPCR as well as by non-directed cell-culture approach on LMH-cells. Virulent NDV was confirmed only in group A (n = 16) comprising small-scale holdings. Phylogenetic analysis of the fusion protein gene of 11 NDV-positive samples obtained from this group assigned all viruses to genotype 2.VIIb and point to four different virus populations that were circulating at the same time in one
governorate, indicating independent epidemiological events. In group B, comprising large commercial broiler far...
Keywords:
-
Correction
-
Source
-
Cite
-
Save
50
References
11
Citations
NaN
KQI