الفهرس 
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Abstract
In t~is study it was i~v~stigated that the avian reovirus is a widely spr~aded disease among commercial ~roilers accompanyin”~
j~ferent disease forps as art~riti~. stuntinq. enteritis and respiratory nistress in Assiut and EI-Menia C-overnorates.
~he spr~]~qical screeninq of 27 niseased ~nd ap~arpntlv ”hpalthy commercial proiler flockEt a~en froJ!! J~ to q(\ dCl~s ravelen dptecti~n of rrecipitatina anti~odi~~ i~ 9 floc~~ (33.3)
JP isolates were recovered from examine~ ’7 co~~ercial ~r0iler flocks. IsoJatp~ werp i~pntifien as avian repviru~~s ~ccordinq
to results of e~q inoculation ann agar gel precipitation {AC:P) te!’it.
SiT isolat~s were su~jcctpd to farth~r identification ~~r o their riological. chemical and serolnqical characteristics.
Pathogenicity to II-nay-old chicken embrvos revealed that all n isolates were lethal and lead to stunting and haemorrhaqes on infected PF~rVos and to the appearance of rock likp Ipsion~ on tp~ CAM. Isolates were resistant to ethpr and chlorofor~. IFol~tes were neutralized ~v the rE’!ference sernl’! of the strain ~-113~. ’rhe pathoqenicitv o~ two selecten i~olates. desiqnated
(J~~iut.I anc rl-~enia,II) was tested for one-day-old cOI’l~eTciaJ chicks as well as ’l-day-oJd chicks. Fxperil’lental infection resulted in stuntina o~ qrowt.... , laMeness, arthritis, ruffliro o~ fpat~ers ~nfl decreas~ ir. hody, ~ursa a~~ ~pleen weight of th~sp
-66Jso!~~
es w~r~ more virulent ~o ~np-dav-olo chi~kp t~an 21day~
ld chicks.
p.~oviru~ i~oJat@s i~ruced decreasp in thr im~une rps,~ns~ of inoculated chicks aqainst Newcastle rj~easp virus whe~ co~’pare~ hv vaccinate~ nnn in~pcted control.
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