By Harriet N. Okechukwu, Anthony A. Chukwuedo, Didacus C. Eze, Amarachukwu O. Igwe, John I. Ihedioha, and John O. A. Okoye
Triple La Sota re-vaccinations can protect laying chickens for 3 months against drop in egg production caused by velogenic viscerotropic Newcastle disease virus infection