Uddin, M., Khan, M., Begum, F. and Mannan, M. 2010. Efficacy study of bio-typhoid® vaccine against fowl typhoid in backyard layer chicken. Journal of the Bangladesh Agricultural University. 7, 2 (Apr. 2010), 295–299. DOI:https://doi.org/10.3329/jbau.v7i2.4737.