Histopathological findings in Dalmatian pelicans (Pelecanus crispus) naturally infected with avian influenza subtype A H5N1 in Bulgaria

Stoimenov, Georgi; Goujgoulova, Gabriela V.; Nikolov, B.; Petrova, R.; Teneva, Atanaska; Dimitrova, I.

doi:10.12681/jhvms.15493

Cited by 4 publications

(1 citation statement)

References 26 publications

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“…The history of HPAI in Bulgaria commenced in 2006 with the occurrence of H5N1 in swans and geese (6). In 2010, H5N1 was reported in common buzzards (16) and in 2015 in Dalmatian pelicans (25). However, these cases were observed in wild birds, with only one outbreak in domestic chickens occurring in a backyard farm and no ensuing mass distribution or dissemination of the disease.…”

Section: Introductionmentioning

confidence: 99%

Pathological changes in natural infection of pheasants with highly pathogenic avian influenza A (H5N8) in Bulgaria

Stoimenov¹,

Goujgoulova²,

Nikolov³

et al. 2019

Journal of Veterinary Research

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Introduction The study of histopathological changes caused by influenza A (H5N8) viral infection in bird species is essential for the understanding of their role in the spread of this highly infectious virus. However, there are few such studies under natural conditions in minor gallinaceous species. This article describes the pathomorphological findings in Colchis pheasants infected naturally with H5N8 during an epizootic outbreak in Bulgaria. Material and Methods Samples of internal organs of 10 carcasses were collected for histopathological and immunohistochemical evaluation, virus isolation and identification, and nucleic acid detection. Results Consistent macroscopic findings were lesions affecting the intestine, heart, lung, and pancreas. Congestion and mononuclear infiltrate were common findings in the small intestine, as were necrosis and lymphoid clusters in the lamina propria of the caeca. Congestion with small focal necrosis and gliosis with multifocal nonpurulent encephalitis were observed in the brain. Myocardial interstitial oedema and degenerative necrobiotic processes were also detected. Immunohistological analysis confirmed systemic infection and revealed influenza virus nucleoprotein in all analysed organs. Conclusion Variable necrosis was observed in the brain, liver, trachea, heart, small intestine, and caeca. Viral antigen was commonly found in the brain, heart, lung and trachea. Contact with migrating waterfowls was suspected as a reason for the outbreak.

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Section: Introductionmentioning

confidence: 99%

Pathological changes in natural infection of pheasants with highly pathogenic avian influenza A (H5N8) in Bulgaria

Stoimenov¹,

Goujgoulova²,

Nikolov³

et al. 2019

Journal of Veterinary Research

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Highly pathogenic avian influenza in Bulgaria - a review

Stoimenov

2022

BJVM

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The aim of this review was to summarise the information about the cases of highly pathogenic avian influenza in Bulgaria during the last two decades. According to the EMPRES-I FAO data, from January 2006 to the end of 2019, 141 HPAI outbreaks have been registered in Bulgaria, with two identified virus serotypes (H5N1 and H5N8). The H5N1 outbreaks were reported in 2006, 2010 and 2015. Almost all H5N1 cases were observed in wild birds, with only one outbreak in domestic chickens in a backyard farm in 2015. From 2016 to the end of 2019, 132 outbreaks of HPAI identified as H5N8 were recorded: sixteen in wild birds and the other 116 - in domestic poultry. Large farms with fattening ducks used for foie gras production in four administrative districts (Plovdiv, Haskovo, Stara Zagora, Dobrich) were mainly affected.

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A review of wild and synantropic birds recorded as reservoirs of avian influenza viruses in Bulgaria

Nikolov¹,

Marinova²,

Murad³

et al. 2020

BJVM

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The aim of the present review is to summarise the information about the species diversity of wild and synanthropic birds, which have been recorded as reservoirs of influenza in Bulgaria until 2018. A total of 17 species of wild and synantropic birds were reported. They belong to 16 genera, 11 families and 10 orders of the class Aves. A list of wild and synantropic birds – potential reservoirs of influenza in Bulgaria is also presented.

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Histopathological findings in Dalmatian pelicans (Pelecanus crispus) naturally infected with avian influenza subtype A H5N1 in Bulgaria

Cited by 4 publications

References 26 publications

Pathological changes in natural infection of pheasants with highly pathogenic avian influenza A (H5N8) in Bulgaria

Pathological changes in natural infection of pheasants with highly pathogenic avian influenza A (H5N8) in Bulgaria

Highly pathogenic avian influenza in Bulgaria - a review

A review of wild and synantropic birds recorded as reservoirs of avian influenza viruses in Bulgaria

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