ILT and ART in poultry

Updated 29.08.2025

Infectious laryngotracheitis (ILT) has not been detected in Norwegian commercial poultry flocks since 1971, but is occasionally observed in backyard poultry flocks. Avian rhinotracheitis (ART), also known as turkey rhinotracheitis (TRT) in turkeys, has never been detected in Norwegian turkey flocks.

The purpose of the surveillance program is to document that Norwegian commercial poultry flocks of chickens are free from ILT and that commercial turkey flocks are free from ART, as well as to help maintain this status.

Background

ILT is a serious, contagious respiratory disease in chickens caused by a herpesvirus. The disease is widespread in many parts of the world, including most European countries. ILT has not been diagnosed in commercial poultry flocks in Norway since 1971, but is sporadically detected in backyard flocks.

ART is a viral disease affecting the upper respiratory tract in poultry. The disease is caused by avian metapneumovirus and is widespread globally and in most European countries. In the early 2000s, antibodies against the virus causing ART were detected in Norwegian broiler and layer flocks. The clinical significance of the infection was uncertain, and chickens were therefore excluded from the surveillance program for ART in 2005. ART, also known as TRT in turkeys, has never been detected in turkeys in Norway.

2024

Surveillance based on serological investigations to monitor infectious laryngotracheitis (ILT) in chickens and avian rhinotracheitis (ART) in turkeys in 2024 did not detect antibodies against gallid herpesvirus 1 (infectious laryngotracheitis virus, ILTV) or avian metapneumovirus (aMPV).

Download report

ILT and ART in poultry 2024 (pdf 743kb)

Previous reports

ILT and ART in poultry 2023 (pdf 439kb)
ILT and ART in poultry 2022 (pdf 437kb)
ILT and ART in poultry 2021 (pdf 436kb)
ILT and ART in poultry 2020 (pdf 524kb)
ILT and ART in poultry 2019 (pdf 595kb)
ILT and ART in poultry 2018 (pdf 561kb)
ILT and ART in poultry 2017 (pdf 350kb)
ILT and ART in poultry 2016 (pdf 558kb)
ILT and ART in poultry 2015 (pdf 1mb)
ILT and ART in poultry 2014 (pdf 9mb)
ILT and ART in poultry 2013 (pdf 696kb)
ILT and ART in poultry 2011 (pdf 861kb)
ILT and ART in poultry 2010 (pdf 589kb)
ILT and ART in poultry 2009 (pdf 678kb)
ILT and ART in poultry 2008 (pdf 714kb)
ILT and ART in poultry 2007 (p. 125) (pdf 6mb)
ILT and ART in poultry 2006 (p. 123) (pdf 3mb)
ILT and ART in poultry 2005 (p. 113) (pdf 4mb)
ILT and ART in poultry 2004 (p. 115) (pdf 4mb)
ILT and ART in poultry 2003 (p. 113) (pdf 6mb)