Investigation of infectious laryngotracheitis outbreaks in Namibia in 2018
Between July and August 2018, two outbreaks of infectious laryngotracheitis caused the death of over 116,000 commercial poultry (layers and broilers) near the city of Windhoek, Namibia. A third outbreak occurred in September 2018 in the north of the country approximately 800 km from the original outbreaks. Sample collection and molecular epidemiological analyses revealed that the outbreaks were most likely caused by poor vaccination practices leading to the reversion to virulence of an ILT vaccine strain. The analyses also indicate that inaccurate declarations were made by one of the farms involved and that illegal movement of animals most likely occurred.
KeywordsPoultry Infectious laryngotracheitis Gallid alphaherpesvirus-1 Namibia Phylogenetic analysis ICP4 Vaccination
The sequences from this study were generated through the Sequencing Services of the Animal Production and Health Sub-programme of the Joint FAO/IAEA Division in Vienna, Austria.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interests.
This article does not contain studies on live animals.
- García M, Spatz SJ, and Guy JS, 2013. Infectious laryngotracheitis. In Diseases of Poultry Swayne DE, Glisson JR, McDougald LR, Nolan LK, Suarez DL, and Nair, V. (Eds.), (13th Ed.), Blackwell Publishing, Ames, Iowa, pp. 161–179Google Scholar
- Shittu I, Sulaiman LK, Gado DA, Egbuji AN, Ndahi MD, Pam E, and Joannis TM., 2016. Sero-epizootiological investigation of infectious laryngotracheitis infection in commercial poultry of Plateau State, north central Nigeria. Journal of Immunoassay and Immunochemistry, 37, 368–375.CrossRefGoogle Scholar