In vitro assessment of the potency of some Newcastle disease vaccine brands in Ibadan, Nigeria

In vitro assessment of the potency of some Newcastle disease vaccine brands in Ibadan, Nigeria
1Okanlawon, A. A., *2Ameen, S. A., 2Kadir, R. A., 2Ambali, H. M., 2Baba, Y. A., 3Azeez, O. M. and 4Owoade, A. A.
1Veterinary Diagnostic Laboratory for Poultry and Livestock Diseases, CHI Farms Ltd, Ibadan, Nigeria
2Department of Veterinary Medicine, University of Ilorin, Nigeria
3Department of Physiology and Biochemistry, University of Ilorin, Nigeria
4Department of Veterinary Medicine, University of Ibadan, Nigeria
*Correspondence to: drsaameen@yahoo.com; ameen.sa@unilorin.edu.ng; +2348125064091; ORCID: //orcid.org /0000-0002-7453-1133

Abstract:

Background: Newcastle disease (ND) is a very common and economically important disease of poultry. There is no drug for treatment of the disease during an outbreak in poultry flocks, and prevention by vaccination is one of the recommended control measures. However, post vaccination outbreaks have been observed on many occasions in chicken flocks and one of the causes has been attributed to possible failure of vaccine to confer immunity. This study was designed to evaluate the potency of ND vaccines available in Ibadan, Nigeria.

Methodology: Haemagglutination (HA) technique and elution phenomenon were employed to evaluate the potency of ND vaccines randomly selected in Ibadan. A total of 45 vaccines comprising 9 brands and 5 different strains were selected for potency test. The vaccine brands included ‘Vireo 116’ (n=10), ‘ABIC’ (n=5), ‘Biovac’(n=9), ‘Nobilis’(n=3), ‘NVRI’(n=12), ‘R2B’ (n=2), ‘BAL-ND’ (n=2), ‘Forte dodge’(n=1) and ‘Jovac’ (n=1), while the vaccine strains in the brands included Lasota, B1, Clone, Komarov, Hitcher, and an unknown strain.

Results: Thirty-five of the 45 (77.8%) ND vaccines tested had more than 4 HA titer (>64) and were therefore regarded as potent. All the 15 (100%) ND Lasota vaccine strain, 7 out of 10 (70%) ND Komarov strain, 4 out of 5 (80%) ND clone and 5 out of 8 (62.5%) ND B1 strains were potent. None of the ND brand ‘R2B’ vaccine as well as Hitchner strain from ‘Nobilis’ brand was potent, but all 5, 2, 1 and 1 vaccines tested from brands ‘ABIC’, ‘BAL-ND’, ‘Fort dodge’ and ‘Jovac’ respectively were potent. Similarly, 9 of 10, 6 of 9, 2 of 3 and 9 of 12 vaccine strains tested from brands ‘Vireo 116’, ‘Biovac’, ‘Nobilis’ and ‘NVRI’ were respectively potent

Conclusion: The occurrence of ND vaccines that are not potent in this study may be contributing to post vaccination failure. It is advisable to subject vaccines to potency test before use.

Key words: in vitro, assessment, potency, Newcastle disease, vaccine brands, vaccine strains Continue reading “In vitro assessment of the potency of some Newcastle disease vaccine brands in Ibadan, Nigeria”

Detection of serum antibody levels against newcastle disease in local chickens in Bauchi metropolis, Bauchi state, Nigeria

O.O Nwankiti, A.J Ejekwolu, I Ibrahim, J.A Ndako, G.O.N Echeonwu

 

Abstract

Poultry diseases are one of the main factors constraining poultry practice in most developing countries. Newcastle disease (ND) is a highly contagious and commonly fatal viral poultry disease caused by Newcastle disease virus (NDV). Detection of antibodies to Newcastle disease virus in 300 blood samples from local chickens slaughtered at Muda Lawal Market Bauchi was carried out using the haemagglutination inhibition test (HI). This was to determine the immune status of local birds to NDV in Bauchi Metropolis. 169 (56.3%) birds tested positive with antibody titre ranging from 2 to 512. The geometric mean titre was 19.7. This low antibody titre reveals the epizootic nature of the virus in the study area and is suggestive of an inter-epidemic phase or early phase of infection pointing a finger to possible economic losses in the event of an outbreak, alongside the role of local chickens in the transmission cycle of NDV to other avian species. Vaccination of local chickens were possible is advocated for.

Key words: Poultry diseases, Newcastle disease, haemagglutination inhibition, antibody titre

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Detection of serum antibody levels against newcastle disease in local chickens in Bauchi metropolis, Bauchi state, Nigeria