Virus

Virus is a very minute particle, parasitic in nature consisting of a nucleic acid molecule contained in a protein coat. Most widely virus are categorised into two classifications: DNA virus and RNA virus. Virus attacks the host cell and replicates the genetic material of host cell to produce offspring’s. Viruses cause very important and dreadful infectious disease such as common cold, diarrhoea, hepatitis, Dengue fever, influenza, rabies, yellow fever, polio, smallpox, AIDS, etc.