Impact of Dermanyssus gallinae infestation on persistent outbreaks of fowl typhoid in commercial layer chicken farms
Although it has rapidly decreased since the early 2000s, fowl typhoid still occurs in commercial layer chickens, causing a significant economic loss in Korea. There is growing concern about the emergence of new pathogenic strains of the causative agent, Salmonella Gallinarum, which is able to overco...
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doaj-b7fada16135d479cb00e276cbc1c07742020-11-27T04:17:12ZengElsevierPoultry Science0032-57912020-12-01991265336541Impact of Dermanyssus gallinae infestation on persistent outbreaks of fowl typhoid in commercial layer chicken farmsHye-Jin Lee0Ji-Yeon Jeong1Ok-Mi Jeong2So-Youn Youn3Jin-Hyun Kim4Dong-Wan Kim5Jong-Ung Yoon6Yong-Kuk Kwon7Min-Su Kang8Animal and Plant Quarantine Agency, Gimcheon-si, Gyeongsangbuk-do, KoreaAnimal and Plant Quarantine Agency, Gimcheon-si, Gyeongsangbuk-do, KoreaAnimal and Plant Quarantine Agency, Gimcheon-si, Gyeongsangbuk-do, KoreaAnimal and Plant Quarantine Agency, Gimcheon-si, Gyeongsangbuk-do, KoreaAnimal and Plant Quarantine Agency, Gimcheon-si, Gyeongsangbuk-do, KoreaAnimal and Plant Quarantine Agency, Gimcheon-si, Gyeongsangbuk-do, KoreaBiogenoci Co., Ltd., Suwon, Gyeonggi-do, KoreaAnimal and Plant Quarantine Agency, Gimcheon-si, Gyeongsangbuk-do, KoreaAnimal and Plant Quarantine Agency, Gimcheon-si, Gyeongsangbuk-do, Korea; Corresponding author:Although it has rapidly decreased since the early 2000s, fowl typhoid still occurs in commercial layer chickens, causing a significant economic loss in Korea. There is growing concern about the emergence of new pathogenic strains of the causative agent, Salmonella Gallinarum, which is able to overcome vaccine immunity. It has also been suspected that the poultry red mite, Dermanyssus gallinae, which is commonly found in layer chicken farms, may be an important cause of the recurrence of fowl typhoid in the farms. This study was conducted to examine changes in the virulence of recent isolates of S. Gallinarum obtained from layer farms and estimate the potential of the disease transmission of D. gallinae in the farms. Clinical and environmental samples and mites collected from layer farms affected by fowl typhoid between 2013 and 2018 were tested for S. Gallinarum. The isolates were characterized by genotypic analyses and in vitro virulence assays with chicken-derived cell lines. Vaccine protection against recent isolates was examined in the chickens. A total of 45 isolates of S. Gallinarum were collected and there was no evidence of changes in their virulence. It has also been demonstrated that the S. Gallinarum 9R vaccine strain widely used in Korea is still effective in controlling fowl typhoid if the susceptibility of birds to the disease is not increased by stress. Salmonella Gallinarum isolated from the outer and inner parts of D. gallinae, environmental dust, and dead birds of the same farm showed the same or closely related genotypes. Consequently, the present study indicated that the horizontal transmission and environmental persistence of S. Gallinarum and the increased disease susceptibility of chickens in layer farms could be mediated by D. gallinae, causing persistent outbreaks of fowl typhoid.http://www.sciencedirect.com/science/article/pii/S0032579120306878Dermanyssus gallinaeSalmonellaGallinarumfowl typhoidlayer |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Hye-Jin Lee Ji-Yeon Jeong Ok-Mi Jeong So-Youn Youn Jin-Hyun Kim Dong-Wan Kim Jong-Ung Yoon Yong-Kuk Kwon Min-Su Kang |
spellingShingle |
Hye-Jin Lee Ji-Yeon Jeong Ok-Mi Jeong So-Youn Youn Jin-Hyun Kim Dong-Wan Kim Jong-Ung Yoon Yong-Kuk Kwon Min-Su Kang Impact of Dermanyssus gallinae infestation on persistent outbreaks of fowl typhoid in commercial layer chicken farms Poultry Science Dermanyssus gallinae Salmonella Gallinarum fowl typhoid layer |
author_facet |
Hye-Jin Lee Ji-Yeon Jeong Ok-Mi Jeong So-Youn Youn Jin-Hyun Kim Dong-Wan Kim Jong-Ung Yoon Yong-Kuk Kwon Min-Su Kang |
author_sort |
Hye-Jin Lee |
title |
Impact of Dermanyssus gallinae infestation on persistent outbreaks of fowl typhoid in commercial layer chicken farms |
title_short |
Impact of Dermanyssus gallinae infestation on persistent outbreaks of fowl typhoid in commercial layer chicken farms |
title_full |
Impact of Dermanyssus gallinae infestation on persistent outbreaks of fowl typhoid in commercial layer chicken farms |
title_fullStr |
Impact of Dermanyssus gallinae infestation on persistent outbreaks of fowl typhoid in commercial layer chicken farms |
title_full_unstemmed |
Impact of Dermanyssus gallinae infestation on persistent outbreaks of fowl typhoid in commercial layer chicken farms |
title_sort |
impact of dermanyssus gallinae infestation on persistent outbreaks of fowl typhoid in commercial layer chicken farms |
publisher |
Elsevier |
series |
Poultry Science |
issn |
0032-5791 |
publishDate |
2020-12-01 |
description |
Although it has rapidly decreased since the early 2000s, fowl typhoid still occurs in commercial layer chickens, causing a significant economic loss in Korea. There is growing concern about the emergence of new pathogenic strains of the causative agent, Salmonella Gallinarum, which is able to overcome vaccine immunity. It has also been suspected that the poultry red mite, Dermanyssus gallinae, which is commonly found in layer chicken farms, may be an important cause of the recurrence of fowl typhoid in the farms. This study was conducted to examine changes in the virulence of recent isolates of S. Gallinarum obtained from layer farms and estimate the potential of the disease transmission of D. gallinae in the farms. Clinical and environmental samples and mites collected from layer farms affected by fowl typhoid between 2013 and 2018 were tested for S. Gallinarum. The isolates were characterized by genotypic analyses and in vitro virulence assays with chicken-derived cell lines. Vaccine protection against recent isolates was examined in the chickens. A total of 45 isolates of S. Gallinarum were collected and there was no evidence of changes in their virulence. It has also been demonstrated that the S. Gallinarum 9R vaccine strain widely used in Korea is still effective in controlling fowl typhoid if the susceptibility of birds to the disease is not increased by stress. Salmonella Gallinarum isolated from the outer and inner parts of D. gallinae, environmental dust, and dead birds of the same farm showed the same or closely related genotypes. Consequently, the present study indicated that the horizontal transmission and environmental persistence of S. Gallinarum and the increased disease susceptibility of chickens in layer farms could be mediated by D. gallinae, causing persistent outbreaks of fowl typhoid. |
topic |
Dermanyssus gallinae Salmonella Gallinarum fowl typhoid layer |
url |
http://www.sciencedirect.com/science/article/pii/S0032579120306878 |
work_keys_str_mv |
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