Characterisation of avian nephritis virus (ANV) in commercial poultry

Summary

Avian nephritis virus (ANV) has been implicated as a cause of disease in chickens with diarrhoea, interstitial nephritis and retarded growth. Some infectious agents, such as infectious bronchitis virus (IBV), also induce similar renal lesions. Differential diagnosis of ANV, and related chicken astroviruses (CAstV), has not been possible until recently and consequently importance of these two viral pathogens for poultry health is little understood. Recent studies overseas have shown that both pathogens are prevalent in broiler flocks and that they differ genetically and possibly also in virulence. It has been considered that ANV is also present in Australia, however nothing is known of its properties or importance. Recently in several broiler flocks in NSW, Victoria and Queensland, chicks age 7 – 10 days , were diagnosed with acute interstitial nephritis and samples submitted to our laboratory for confirmation. In some of these cases IB vaccine virus was detected and in some others ANV was detected by an in house PCR. One of the specimens has now been passaged in vitro and seems to contain viable ANV. Limited sequencing of ANV from one sample from NSW indicated that this virus differ from ANV detected in other countries. We propose to continue with the characterisation and isolation of ANV from diagnostic samples in order to establish type and properties of ANV present, correlate clinical and pathological manifestation of ANV with the genetic diversity of the virus, develop reagents and method for their diagnosis, and advise industry of significance of this virus for poultry health and quality control

Program

Chicken Meat

Research Organisation

The University of Melbourne

Objective Summary

Develop diagnostic methods for ANV and other chicken astroviruses (CAstVs) Generate purified virus for virus stocks, and biological and genetic characterisation Determine seroprevalence in broiler flocks and prevalence of virus in young chicks from suspected and already identified locations Sequence the complete genome of the isolated ANV and compare with ANV strains from other countries

Project Code

PRJ-005199

Project Stage

Closed

Project Start Date

Monday, May 3, 2010

Project Completion Date

Friday, August 30, 2013

Journal Articles From Project

Not Available

National Priority

Safeguarding Australia

National Priority

Adoption of R&D

National Priority

CME-Improve chicken meat production through the whole supply chain

Contact

Related publications

04.06.15

Characterisation of avian nephritis virus (ANV) in Australian commercial poultry