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Articles by A. Ballal
Total Records ( 2 ) for A. Ballal
  A. Ballal , A. M. Elhussein and A. E. Karar
  Infectious bronchitis (IB) virus field isolates were serotype using virus neutralization (VN) and haemagglutination inhibition (HI) tests. The viruses were isolated from an outbreaks of IB in broiler and layer chicken flocks in Sudan during 2000- 2001. Four isolates (3 from layer and 1 from breeder broiler flocks) were found antigenically similar to IB virus strain 4/91. With neutralization index (NI) 4.4 - 5.0 and VN titer = 11 (log ). 2 On the other hand, four isolates from commercial broiler flocks and one isolate from layer were found antigenically similar to IB Massachusetts Mass. serotypes with HI titer = 11 (log ). This is the first report of 2 various IB serotypes that are prevalent in Sudan.
  A. Ballal , A.E. Karrar and A.M. ElHussein
  Outbreaks of suspected IB disease occurring in a number of commercial layer flocks at Khartoum and El Gazira states were studied during years (2000- 2001). Affected birds were of different breeds (Lohmann, Bovans Hisex). Their ages were from 5 / –7 months. The main clinical signs varied from mild respiratory signs to diarrhea sometimes yellowish in colour. Drop in egg production (up to 60%) was recorded in some flocks. IB virus was isolated from these outbreaks. Using virus neutralization (VN) and haemagglutination inhibition (HI) tests, three of these IB field isolates (M114/2000, K170/2000 and K158/2001) were antigenically similar to IB virus strain 4/91 (Neutralization index 4.4 to 4.8 and VN titer > 11(log ) were recorded). Isolate (K110/2000) on the other hand, was antigenically similar to IB virus Mass. (M41) strain (HI titer >11 log was recorded). This 2 is the first time to identify IB virus strain antigenically similar to IB virus strain 4/91 in Sudan.
 
 
 
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