Increased Disease Prevalence of Avian Influenza in Poultry Caused by Imperfect Vaccination
ثبت نشده
چکیده
Vaccination of poultry is an important control measure for avian influenza employed in the countries where the disease is endemic. We have formulated a coupled ODE-PDE model of avian influenza in domestic birds with imperfect vaccination and age-since-vaccination structure, which includes distinct features of vaccine-induced partial protection. Interestingly, our results show that vaccination can paradoxically increase the total number of infected by way of inducing high levels of asymptomatic carriers of the virus. This ”silent spread” of avian influenza has been documented in some poultry farms undergoing vaccination. In this talk, we focus on the mechanisms which can cause this silent spread of avian influenza
منابع مشابه
Synbiotic enhances immune responses against infectious bronchitis, infectious bursal disease, Newcastle disease and avian influenza in broiler chickens
Increased susceptibility of birds to avian pathogens in intensive husbandry system has emphasized on necessity of improvement of innate and specific immune responses of birds by the fast establishment of a beneficial microflora and immune stimulator factors to guarantee healthy and low-price products. During this study, 192 one-day-old broiler chicks (Ross-380) in four groups with three replica...
متن کاملApplying conserved peptides of NS1 Protein of avian influenza virus to differentiate infected from vaccinated chickens
Avian influenza (AI) is a highly contagious disease in poultry and outbreaks can have dramatic economic and health implications. For effective disease surveillance, rapid and sensitive assays are needed to detect antibodies against AI virus (AIV) proteins. In order to support eradication efforts of avian influenza (AI) infections in poultry, the implementation of “DIVA” vaccination strategies, ...
متن کاملModeling the Prevalence of Avian Influenza in Guilan Province Using Data Mining Models and Spatial Information System in 2016: An Ecological Study
Background and Objectives: Infection of birds to Highly Pathogenic Avian Influenza (HPAI) and their extinction impose heavily losses on the livestock and poultry industry along with public health. Nowadays, due to the volume and variety of data, the need of using location-based technologies and data mining sciences has become inevitable. This study aims to model the prevalence of avian influenz...
متن کاملThe Combined Use of rHVT-H5 and rHVT-F Vector Vaccines in the Hatchery Enhances Immunity against Highly Pathogenic Avian Influenza H5N1 and Velogenic Newcastle Disease Viral Infections in Commercial Chickens
Highly pathogenic avian influenza H5N1 and Newcastle disease viral infections cause severe illness in chickens and vaccination is a strategic tool of controlling these diseases. Hence, this study was conducted to evaluate the efficacy of using both recombinant herpesvirus of turkey (rHVT-H5 and rHVT-F) vector vaccines at day-old, in the hatchery, under field conditions. Vaccinated chickens were...
متن کاملControl of Highly Pathogenic Avian Influenza by Evidence-Based Vaccinology: Past Progress, Future Prospect
Background and Objectives: Highly pathogenic avian influenza (HPAI) viruses are particularly important due to huge economic consequences and public health concerns. During recent years, because of the severity of epidemics and failure in the control and eradication of HPAI, vaccination has been introduced into the National Prevention and Control Program of some countries, including Iran. This a...
متن کامل