Viral diseases - avian encephalomyelitis, Biology

Assignment Help:

Viral Diseases

Avian encephalomyelitis

This is enterovirus disease of chicken, pheasants, turkeys and Japanese quails caused by the member of the family Picornaviridae. It causes inapparent infection or drops in egg production in adult layer birds, whereas in young chicks, it is responsible for epidemic tremors. There are 15 serotypes of the virus which are enterotopic in nature which differ in their neurotropism and virulence. The morbidity and mortality varies depending on the immune status of the birds.  The disease is transmitted vertically through infected eggs or horizontally by ingestion of contaminated food and water. The virus is resistant to environmental conditions particularly if protected by organic matter.

Symptoms and lesions: In layers, the drop in egg production is very low (5-10%) and of short duration (less than 2 weeks). In breeders there may be a drop in hatchability of about 5%, but there is serious disease in the progeny involving central nervous system. The clinical signs include dullness, ataxia and tremors of the head and neck followed by paralysis, prostration and death. The mortality may reach upto 25%. Unilateral or bilateral blindness or corneal opacity may also be seen. There may not be any gross lesions seen during PM examination. In central nervous system, the inflammatory lesions are noticed in brain and ganglions however, peripheral nerves are not affected.

Diagnosis: Clinical symptoms and histopathological lesions, virus isolation and identification and detection of viral antigen in brain by fluorescent antibody technique confirm the diagnosis.

Prevention and control: Hatchery biosecurity and general hygienic measures should be followed.


Related Discussions:- Viral diseases - avian encephalomyelitis

What is secretary diarrhoea, Q. What is Secretary diarrhoea? Secretary ...

Q. What is Secretary diarrhoea? Secretary diarrhoea: It is a result of active secretion OF electrolytes and water by the intestinal epithelium caused by bacterial and viral inf

Non-viral vectors, Non-viral vectors   Viral vectors are highly effici...

Non-viral vectors   Viral vectors are highly efficient but when it comes to large scale production at the commercial level, non-viral serve as a better choice. These methods p

Explain clinical manifestations of cardiomyopathy, Q. Explain Clinical Mani...

Q. Explain Clinical Manifestations of cardiomyopathy? 1) Asymptomatic, when the diagnosis is made by 2D Echocardiography. 2) Enlargement of LV. Apex is shifted down and out.

Ions , how do i find an atomic structure

how do i find an atomic structure

Effects of failing to prepare adjusting entries, Failure to organize proper...

Failure to organize proper adjusting entries causes net income and the balance sheet to be in error. Using Micro Train Company as an instance this section has discussed and illustr

Discuss mental nerve and its anatomic variation, Discuss mental nerve, its ...

Discuss mental nerve, its anatomic variation and surgical importance. Mental nerve, branch of inferior alveolar nerve is a very important landmark during osteotomy procedures.

Explain prophylaxis of lyme disease, Explain Prophylaxis of lyme disease ...

Explain Prophylaxis of lyme disease No vaccine is currently available to prevent Lyme disease in humans. Avoidance of ticks and use of tick repellents such as DEET or picaridin

Cytological approach, Write an essay on cytological approach in taxonomy.

Write an essay on cytological approach in taxonomy.

PLASMODIUM LIFE CYCLE, elucidate a life cycle of a plasmodium that causes m...

elucidate a life cycle of a plasmodium that causes malaria

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd