Pathology of an outbreak of highly pathogenic avian influenza A(H5N1) virus of clade 2.3.2.1a in turkeys in Bangladesh. (January 2021)

• Record Type: Journal Article
• Authors: Mumu, Tanjin T.; Nooruzzaman, Mohammed; Hasnat, Azmary; Parvin, Rokshana; Chowdhury, Emdadul H.; Bari, Abu S. M.; Islam, Mohammad R.
• Is Part Of: Journal of veterinary diagnostic investigation. Volume 33:Number 1(2021)
• Page Start: 124
• Page End: 128
• Publication Date: 2021-01
• Subjects: avian influenza A virus -- Bangladesh -- clade 2.3.2.1a -- H5N1 -- histopathology -- turkeys; Veterinary medicine -- Diagnosis -- Periodicals; 636.0896075
• DOI: 10.1177/1040638720965540
• Languages: English
• ISSNs: 1040-6387

Abstract

A mixed-aged flock of 130 turkeys in Bangladesh reported the sudden death of 1 bird in September 2017. Highly pathogenic avian influenza A(H5N1) virus was detected in 3 turkeys, and phylogenetic analysis placed the viruses in the reassortant clade 2.3.2.1a. The birds had clinical signs of depression, diarrhea, weakness, closed eyes, and finally death. The mortality rate of the flock was 13% over the 6 d prior to the flock being euthanized. At autopsy, we observed congestion in lungs and brain, hemorrhages in the trachea, pancreas, breast muscle, coronary fat, intestine, bursa of Fabricius, and kidneys. Histopathology revealed hemorrhagic pneumonia, hemorrhages in the liver and kidneys, and hemorrhages and necrosis in the spleen and pancreas. Significant changes in the brain included gliosis, focal encephalomalacia and encephalitis, and neuronophagia.