OKONKWO, C.; IWUAMADI, F. .; SANDA, M.; IGWE, A. . Vaccination indices and concomitant serological status of Newcastle disease in chickens in Aba and Umuahia of Abia State. Sokoto Journal of Veterinary Sciences, [S. l.], v. 20, n. 1, p. 35–41, 2022. DOI: 10.4314/sokjvs.v20i1.5. Disponível em: https://www.ajol.info/index.php/sokjvs/article/view/225287. Acesso em: 7 oct. 2026.