SARS 

 

  Viruses

A virus is an agent which is submicroscopic, intracellular parasite containing a protein coat which surrounds an inner core of genetic material that may be DNA or RNA. It is the smllest of all infectious agent with an average of about 100 nanometers in length. It has very few genes and proteins and needs to invade other cells to reproduce itself. It is capable of causing diseases in human and other living organisms.

Virus attached to cell

 

 

 

 

 

 


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