The Role Of Some Free-Flying Birds In The Transmission And spread of Newcastle Diseases in Egypt

1) Faecal swabs were taken from 140 ~tian doves hunted from different rural localities in Kalioubia gover-norate.2) 15 NDV strains were isolated trom the hunted doves. The percentage of virus isolation was 10.1%.3) Assessment of virulence of the isolates by m~n death time of min~mal lethal dose in chick embryos (MDf)ranged from 33.6 - 72 hours and proved that all teste~ strains were of4) Determination of vlscerotroopic nature of tbe iso-lated strains by c1.oaca1. infection o’f t’fiC) -m.on.tb.& 8u.see~tib ’lechickens gave evidence that all the isolates were ot velogenicviscerotropic NDV (VVND~) •5) Determination ot the intracerebral pathogenicity index (TCPT) in a day-old chicks revealed that all the isolateswere of velogenic type. The (IOPI) ranged from 1.4-1.9 index.6) The susceptibility of the Egyptian dOves (strepto- pelia sen~galensis aegyptiacus) to VVNDV by different routes