It is a highly contagious disease, fatal course, high economic impact, as it represents a limiting factor export of poultry products. The present research work evaluated the results of 100 serum samples collected to birds reared in commercial farms (broilers, egg-laying hens, and breeders) and 100 serum samples collected to birds reared in non-technical farms (backyard and fighting birds) that were analyzed by the hemoagglutination inhibition (HI) test for the Newcastle disease (ND). Samples were collected by standard norm. An interpretation table for the results of the hemoagglutination inhibition test was designed by experts taking into consideration the number and type of vaccines against ND used. The prevalence rate of birds with antibody titers compatible to a Newcastle virus challenge was 1.8 ± 1.4% in birds from commercial farms and 9.9 ± 3.4% in birds from non-technical farms. The logistic regression analysis showed that birds from non-technical farms represent a risk factor (p<0.0001) in obtaining antibody titers compatible to a Newcastle virus challenge (Odds Ratio was 6.04 with confidence interval of 2.5-13.8) as compared to birds from commercial farms. The results showed that the ND virus is endemic in the area of ILam, especially in birds of non-technical farms.
