Maedi/visna, Biology

Assignment Help:

Maedi/visna

Maedi, a progressive pneumonia, and visna, a neurotropic disease, found in sheep and goats are caused by the Maedi/visna virus, belonging to the family Retroviridae. It is a zoonotic disease. The disease has not been reported from India.Epidemiology: The transmission of disease takes place through inhalation, drinking contaminated water and colostrum by young ones. The intrauterine transmission of  the virus has also been observed.

Clinical signs: Incubation period of over 2 years and has protracted clinical course lasting 6 months to several years.Maedi (progressive pneumonia): Progressive weight loss and dyspnoea, initially detected after exercise, and becomes more apparent over time. Affected sheep straggles, head jerking with inspiration and nostrils are flared. There may be nasal discharge and cough.


Visna: Weakness of the hindleg and stumbling. Progressive weight loss and trembling of facial muscels and limbs is seen leading to paraplegia.
Diagnosis: The disease is diagnosed histopathology. Enzyme immunoassay, agar gel diffusion and syncytial plaque reduction assays are used for detection of antibodies. Western blotting is used for confirmation of the disease. Viral DNA is detected in cells by in situ hybridization or viral RNA amplification by RT-PCR.


Prevention and control: Slaughtering of sero-positive sheep is one of the approaches suggested for containing the infection. Dipping of sheep with acaricides and spraying in environment controls ticks.


Related Discussions:- Maedi/visna

Late recurrence of artgirza--recurrence of angina, Late recurrence of a...

Late recurrence of artgirza: This is a reflection of progress of disease in the native coronary arteries distal to the grafts or narrowing or blockage of one or more of the g

Classification of living organisms, Classification of Living Organisms ...

Classification of Living Organisms The world of living organisms is extremely diverse. Biologists call these diverse forms 'species'. It is estimated that over fifteen lakh (1

Origin of cell wall, Origin of Cell Wall - The cell wall is product ...

Origin of Cell Wall - The cell wall is product of cytoplasm. The cytoplasmic organelles such as endoplasmic reticulum, golgi apparatus play a very important role in the f

What are the results of pulmonary artery banding, What are the Results of p...

What are the Results of pulmonary artery banding ? Results of surgery for ventricular septa1 defects are excellent. Though the mortality is not 0 per cent, in a large series it

Explain intraoral barrier techniques, Q. Explain Intraoral Barrier Techniqu...

Q. Explain Intraoral Barrier Techniques? Rubber dam A rubber dam is used whenever possible for improved vision and access and to reduce dental personnels' exposure to micr

VASCULAR PLANTS., WHAT TRAITS ALLOWED VASCULAR PLANTS TO GROW TALL

WHAT TRAITS ALLOWED VASCULAR PLANTS TO GROW TALL

Antibody structure, Antibody Structure: An antibody molecule consist of...

Antibody Structure: An antibody molecule consist of two alike light chains ( 220  amino acids each) ad two similar heavy chains (about  440-450  amino acids each) held together

Intrisic and Extrinsic Limiting Factors, How do the ideas of energy and che...

How do the ideas of energy and chemical cycles, community structure, biodiversity and succession fit together to form the basis of the way the natural world works?

Where can these epithelia are found in the human body, How dissimilar is th...

How dissimilar is the simple cuboidal epithelium from the columnar epithelium? Where can these epithelia are found in the human body? The simple cuboidal epithelium is made of

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