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Articles by K.F. Chah
Total Records ( 3 ) for K.F. Chah
  O.J. Ibu , J.O.A. Okoye , E.P. Adulugba , K.F. Chah , S.V.O. Shoyinka , E. Salihu , A.A. Chukwuedo and S.S. Baba
  Newcastle disease (ND) is an acute rapidly spreading, contagious, nervous and respiratory disease of domestic and wild birds caused by the Avian Paramxyovirus 1, the Newcastle disease (ND) virus. ND is endemic in Nigeria. The reservoir status of wild and captive birds for ND virus in central Nigeria is assessed in this study. Cloacal swabs were taken from one hundred and sixty three birds caught from five Local Government Council areas of Plateau, Benue and Kaduna States in central Nigeria. A total of thirteen ND Viruses were isolated from the three States. Viz: 8 isolates from Plateau, 4 from Benue and 1 from Kaduna State. One hundred and fifty three of the birds sampled belonged to 30 avian species in 10 Orders while ten birds were unidentified. Only 7% of the species in three Orders yielded ND viruses. The 13 isolates were characterized using the Mean death time of the Minimum lethal dose (MTD/MLD); Intracerebral Pathogenicity index (ICPI) Intravenous Pathogenicity index (IVPI) and the Reverse transcriptase polymerase chain reaction (RT/PCR). The results show that 12 of the isolates were of the lento genic strain while 1 isolate belonged to the Merogenic strain. The implication of these findings on the poultry industry in the country is discussed.
  O.J. Ibu , J.O.A. Okoye , S.S. Baba , S.V.O. Soyinka , K.F. Chah , J. Antiabong , D. Eze , E.A. Salihu and S.B. Oladele
  The study was carried out to assess the Haemagglutinin thermostability of Newcastle disease virus isolates obtained from wild birds in three climatically distinct states in central Nigeria. Identification of heat stable ND virus isolates from the locality will provide environmentally friendly thermostable vaccine candidates for rural poultry. The 12 field virus isolates and the 5 vaccine virus strains showed variable degrees of heat stability. Three field isolates each was inactivated in 5 min, three in 10 min and one in 15 min. One isolate was inactivated in 20 min while two and three strains got inactivated in 25 and 30 min respectively. The most thermostable of the field isolates was inactivated in 40 min. A more thermostable clone was subsequently derived from the latter strain as a local vaccine candidate. For the vaccine strains, NDV (I/O) and NDV (K) were inactivated in 20 min while NDV (L) was inactivated in 25 min. The velogenic strain (Herts) was inactivated in 40 min. The two established thermostable strains, NDV4 and NDVI2 were inactivated in 90 min each. The thermostable profile of the field virus strains did not vary with the climatic background of the isolates.
  A.C. Mgbeahuruike , K. Aliyoo , M. Karlsson and K.F. Chah

Objective: This study was conducted to investigate the fungal community structure in Nigerian poultry environments. Materials and Methods: In ten (layer and broiler) farms, samples were collected from drinkers, doors, feeders, floors, poles, roofs, walls and window nets. Fungal isolation was done on Sabouraud dextrose agar (SDA) followed by identification using morphological and microscopic features. The fungal identities were confirmed by sequencing the internal transcribed spacer region, followed by phylogenetic analysis. Antifungal susceptibility testing was done using nystatin (100 μg mL1), fluconazole (25 μg mL1) and voriconazole (1 μg mL1). Results: A total of 244 fungi were identified in all the locations. In the layers farm, 112 fungal isolates were identified, while 132 isolates were identified in the broiler farm. In all the poultry farms, Aspergillus and Candida species had the highest occurrence of 32.4 and 24.6%, respectively while other fungi (Dematiaceous, Rhizopus, Penicillium, Mucor and Rhodotorula) had 43% occurrence. For the locations, poles and window nets had the highest isolation frequency of 15.2% each. The roofs, feeders and floors had 14.3 and 13.1%, while other locations had 27% isolation rate. Phylogenetic comparison of the isolates showed that closely related fungi from different countries formed separate clades. Candida species were sensitive to the three antifungal agents with the zone of inhibition diameter ranging from 19.08-25.36 mm. All the Aspergillus species were resistant to fluconazole but were sensitive to nystatin and voriconazole. Conclusion: Different fungi were identified in this study and they were all susceptible to nystatin antifungal agent.

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