000			03050cam a2200349 a 4500
003			EG-GiCUC
005			20250223031831.0
008			171024s2017 ua f m 000 0 eng d
040			_aEG-GiCUC _beng _cEG-GiCUC
041	0		_aeng
049			_aDeposite
097			_aPh.D
099			_aCai01.10.17.Ph.D.2017.Wa.P
100	0		_aWahid Hussein Mahmoud Eldabae
245	1	0	_aPreparation of saponin-treated vaccine from NDV genotype chinese 7d / _cWahid Hussein Mahmoud Eldabae ; Supervised Hussein Aly Hussein , Ismail Mohamed Reda , Nagwa Sayed Ata
246	1	5	_aتحضير لقاح معالج بمادة الصابونين من فيروس مرض النيوكاسل النوع الوراثى الصينى 7د
260			_aCairo : _bWahid Hussein Mahmoud Eldabae , _c2017
300			_a177 P. ; _c25cm
502			_aThesis (Ph.D.) - Cairo University - Faculty of Veterinary Medicine - Department of Virology
520			_aIn the present study, chemical attenuation was carried out for local NDV genotype vIId designated as NDV-F278-RLQP-CH-EG circulating in Egypt. The virus was propagated in 9-11 day SPF eggs via allantoic cavity and was serially passaged for 35 passages. Then, nitrous acid was used for attenuation and the treated virus was inoculated into SPF eggs. After incubation at 26{u00B0}C for 4-6 days, the harvested allantoic fluid revealed negative hemagglutination even after five passages of such harvest. Assaying of the allantoic fluid harvested from fifth passage of treated virus by real time RT-PCR revealed positive result indicating that nitrous acid affects the HA property of the virus. Inoculation of treated virus in SPF chickens, mortalities developed along ten days observation period and HA property of the virus was recovered again following isolation in SPF eggs indicating failure of attenuation. Therefore, second cycle of treatment using saponin was applied on the propagated virus after 35 passages. Saponin was used to treat virus at different times 10,20,30,45 and 60 minutes then, inoculated into SPF eggs and incubated at 37{u00B0}C for 3-5 days. The harvested allantoic fluid revealed positive hemagglutination. When treated virus incubated with saponin for 30 to 60 minutes inoculated in SPF chickens no clinical signs or mortalities were appeared. Challenge trial of different chicken groups with the virulent NDV genotype vIId designated as NDV-B7-RLQP-CH-EG-12 revealed 100%, 90% and 90% protection at times 30, 45 and 60 minutes respectively; indicating that the reaction of virus with saponin for 30 minutes was the best time to be used in vaccine preparation.
530			_aIssued also as CD
653		4	_aChemical attenuation
653		4	_aNDV genotype VIId
653		4	_aSaponin and chicken experiment
700	0		_aHussein Aly Hussein , _eSupervisor
700	0		_aIsmail Mohamed Reda , _eSupervisor
700	0		_aNagwa Sayed Ata , _eSupervisor
856			_uhttp://172.23.153.220/th.pdf
905			_aNazla _eRevisor
905			_aSamia _eCataloger
942			_2ddc _cTH
999			_c63136 _d63136