Yersiniosis - Birds - Revision history

Bara at 14:34, 20 July 2012

2012-07-20T14:34:29Z

Bara at 15:18, 1 September 2011

2011-09-01T15:18:44Z

HelenD: Created page with "Also known as: '''''Avian Pseudotuberculosis''' Caused by: ''Yersinia pseudotuberculosis'' ==Introduction== The causal organism is ''Yersinia pseudotuberculosis'', a '''Gram-ne..."

2011-08-23T10:34:16Z

Created page with "Also known as: '''''Avian Pseudotuberculosis''' Caused by: ''Yersinia pseudotuberculosis'' ==Introduction== The causal organism is ''Yersinia pseudotuberculosis'', a '''Gram-ne..."

New page

Also known as: '''''Avian Pseudotuberculosis'''

Caused by: ''Yersinia pseudotuberculosis''

==Introduction==
The causal organism is ''Yersinia pseudotuberculosis'', a '''Gram-negative coccobacillus'''. There are variations in virulence, and its survival outside the body is similar to ''Pasteurella multocida''.

The disease has a '''worldwide distribution''', affecting the various species of '''domestic poultry''' and a wide variety of '''wild and caged birds''' and rodents.

Clinical cases in commercial poultry are uncommon and usually result from '''faecal contamination''' of the birds' environment or feed.

It has been reported in humans but is '''not an important zoonosis'''. Human infection is usually linked to the consumption of food contaminated by birds or rodents.

'''Young birds''' between 4-10 weeks are more susceptible.

The bacteria gains entry through the intestinal mucosa or occasionally through breaks in the skin. ''Y. pseudotuberculosis'' can be a normal gut inhabitant of a variety of migratory avian species and this may be relevant to the introduction of pseudotuberculosis into a region.

==Clinical Signs==
Signs are not very specific.

'''Chronic cases''' show persistent diarrhoea, weakness, ruffled feathers, lameness and progressive emaciation.

Some birds may show no premonitory signs and may just be '''found dead'''.

==Diagnosis==
'''Post-mortem findings''' include: enlargement of the liver and spleen, mottled or speckled appearance of the affected organs.

Chronic cases may show multiple caseous tubercle-like lesions of varying size in the liver, the spleen and sometimes the lungs. Severe enteritis may be observed.

The organism can be '''isolated and identified from blood or lesions'''.

'''Histopathological confirmation''' on liver or spleen can be helpful.

==Treatment and Control==
'''Treatment''' may be of benefit for at-risk birds within a flock in which disease has been diagnosed. Treatment can be administered via the drinking water, and antibiotics available include: '''sulfadiazine/trimethoprim''' or those from the '''tetracycline group'''. Further administration should be on the basis of '''culture and sensitivity testing'''.

'''Prevention''' depends on high standards of hygiene and management. Direct '''contact with wild birds and rodents''' should be prevented, and '''contamination of feed''' or the environment with faeces from these animals should be avoided.

{{Learning
|flashcards = [[Avian Medicine Q&A 19]]
}}

==References==
Chauhan, Y. (1996) '''Poultry Diseases, Diagnosis and Treatment''' ''New Age International''

Pattison, M. (2008) '''Poultry Diseases''' ''Elsevier Health Sciences''

[[Category:To Do - Helen]]
[[Category:To Do - Review]]

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 Also known as: '''''Avian Pseudotuberculosis'''
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 {{review}}
 [[Category:Alimentary Diseases - Birds]]
 [[Category:Expert Review - Bird]]

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 Also known as: '''''Avian Pseudotuberculosis'''
-Caused by: ''Yersinia pseudotuberculosis''
+Caused by: ''[[Yersinia pseudotuberculosis]]''
 ==Introduction==
-The causal organism is ''Yersinia pseudotuberculosis'', a '''Gram-negative coccobacillus'''. There are variations in virulence, and its survival outside the body is similar to ''Pasteurella multocida''.
+The causal organism is ''Yersinia pseudotuberculosis'', a '''Gram-negative coccobacillus'''. There are variations in virulence, and its survival outside the body is similar to ''[[Pasteurella multocida]]''.
 The disease has a '''worldwide distribution''', affecting the various species of '''domestic poultry''' and a wide variety of '''wild and caged birds''' and rodents.
@@ Line 14: / Line 14: @@
 '''Young birds''' between 4-10 weeks are more susceptible.
-The bacteria gains entry through the intestinal mucosa or occasionally through breaks in the skin. ''Y. pseudotuberculosis'' can be a normal gut inhabitant of a variety of migratory avian species and this may be relevant to the introduction of pseudotuberculosis into a region.
+The bacteria gain entry through the intestinal mucosa or occasionally through breaks in the skin. ''Y. pseudotuberculosis'' can be a normal gut inhabitant of a variety of migratory avian species and this may be relevant to the introduction of pseudotuberculosis into a region.
 ==Clinical Signs==
@@ Line 47: / Line 47: @@
-[[Category:To Do - Helen]]
+{{review}}
-[[Category:To Do - Review]]
+[[Category:Alimentary Diseases - Birds]]