Maedi/visna, Biology

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.

Posted Date: 9/18/2012 7:09:57 AM | Location : United States







Related Discussions:- Maedi/visna, Assignment Help, Ask Question on Maedi/visna, Get Answer, Expert's Help, Maedi/visna Discussions

Write discussion on Maedi/visna
Your posts are moderated
Related Questions
#question.endocrine organ in crustaceans

Fruits Diabetics should have fruits every day. Be careful to select fruits and fruit juices, citrus fruits, such as oranges, grapefruit should be included. Tell them to eat fru

How is light from the sun transformed into chemical energy to be used by the living beings on earth? Light from the sun is transmitted into chemical energy contained in organic

Define Burette - Nutritional Biochemistry A burette is a vertical cylindrical piece of laboratory glassware with a volumetric graduation on its full length and a precision tap,


Q. What are anteromedial aspects of temporal lobes? Olfactory Cortex - found in anteromedial aspects of temporal lobes receive sensory information directly from the olfactory n

Explain Vasopressindrug term? As a single bolus of 40 U, vasopressin has been recommended as an alternative to epinephrine in VF/pulseless VT refractory to defibrillation. Furt

Define Binding of Protein with Other Compounds? In addition to water, lipids and volatile flavours, food proteins can bind a number of other substances through weak interaction

Characteristic Features of Avian Gastrulation Creation of hypoblast and its important role in formation of the axis and orientation of embryo. Existence of the cells

do you can write argument i will send you the article you want write from with rules please call me at 623-552-8532