Abstract
Newcastle disease (ND) is a highly pathogenic and contagious
viral infectious disease of poultry that causes a very serious problem for
poultry production and economic loss worldwide. ND has been an epizootic
disease in Vietnam. Information about the risk factors that are associated with
virus transmission in backyard chickens in Vietnam is limited. To provide more
epidemiological information about ND in Vietnam, this study was performed to
estimate NDV prevalence and identify the risk factors for ND virus (NDV)
infection in birds at the backyard flock level. Choanal swabs were taken from
400 randomly selected birds from 100 apparently healthy flocks from May to July
2020. Based on RT–PCR analysis, 43 of 400 swab samples (10.75%; 95% CI 8–14.17)
and 21 of 100 flocks (21%; 95% CI 14.17–29.98) were positive for the fusion (F)
gene of NDV. The management practice risks were: backyard flocks contacting
wild birds (OR = 3.89; P = 0.030), mixed flocks with different types and
species of birds (OR = 5.46; P = 0.004), and infrequency of cleaning and
disinfecting poultry houses (OR (odds ratio) = 4.43; P = 0.034). The second and
third risks (above) showed a positive interaction on the risk of NDV infection
in birds (OR = 39.38; P = 0.001), and the first risk showed a negative
interaction. Further studies on NDV surveillance in domestic waterfowl,
longitudinal studies, a well-optimized RT-qPCR assay, and genetic
characterization are needed. The development of handbooks, flyers, or lessons
for educating poultry keepers are also needed.
Fulltext: https://doi.org/10.1080/03079457.2022.2160697
(Source: https://www.proquest.com/scholarly-journals/detection-assessment-risk-factors-associated-with/docview/2781057882/se-2?accountid=28030)