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Chapter: 11th 12th standard bio zoology Human Body higher secondary school

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A new disease called SARS Virion

A new disease called SARS Virion
Severe Acute respiratory Syndrome (SARS) is a respiratory illness that has recently been reported in South East Asia, North America and Europe. It has created panic among the people all over the world and has resulted in great economic loss for many countries like China, Singapore etc.

A new disease called SARS Virion
Severe Acute respiratory Syndrome (SARS) is a respiratory illness that has recently been reported in South East Asia, North America and Europe.
It has created panic among the people all over the world and has resulted in great economic loss for many countries like China, Singapore etc.

Symptoms

 
It begins with high fever. Other symptoms include headache, discomfort and body aches. Patient may develop dry cough and have trouble in breathing.
 

How SARS spread

 
It appears to spread by person to person contact especially with infectious material (for example respiratory secretions.)
 
The viruses that cause SARS are constantly changing their form which will make developing a vaccine difficult. SARS is caused by a group of viruses called corona viruses which are enveloped viruses. Their genome is single stranded RNA. The nucleocapsid is helical. These viruses have petal shaped surface projections arranged in a fringe like a solar corona.

Viral vaccines

 
The purpose of viral vaccine is to utilize the immune response of the host to prevent viral diseases. Vaccination is the most cost effective method of prevention of serious viral infection.

Interferons (IFNs)

 
They are the host coded proteins of cytokine family that inhibit viral replication. They are produced by intact animal or cultured cells in response to viral infection or other inducers. They are believed to be the part of body's first line of defense against viral infection.
 

Significance of Viruses

 
            Viruses are a kind of biological puzzle to biologists since they are at the threshhold of living and non-living things showing the characteristics of both.
 
            Viruses are very much used as biological research tools due to their simplicity of structure and rapid multiplication. They are widely used in research especially in the field of molecular biology, genetic engineering, medicine etc.
 
            Viruses are used in eradicating harmful pests like insects. Thus they are used in Biological Control Programmes.

            Plant Viruses cause great concern to agriculturists by their pathogenic nature. Bacteriophages attack the N2 fixing bacteria of soil and are responsible for reducing the fertility of soil.

            In industry, viruses are used in preparation of sera and vaccines.


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