Biology - Virus


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Introduction

  • A virus is a micro infectious agent, which is found as parasite in the living cells of other organisms.

  • Virus replicates swiftly inside the living cells of other organisms.

  • Virus is a Latin term meaning ‘poison’ and other ‘noxious’ liquids.

  • Viruses can infect any type of life forms, ranging from animals and plants to microorganisms, including bacteria and archaea.

Virus
  • The study of viruses is known as virology.

  • Virus is first discovered by Dmitri Ivanovsky in 1892.

  • Virus has the properties of living as well non-living.

  • One of the living properties is – virus has either DNA or RNA (never both).

  • One of the non-living properties is – virus has no protoplasm.

Types of Virus

  • Based on parasitic nature, virus is categorized as −

    • Animal Virus

    • Plant Virus

    • Bacterial Virus

    • Archaeal Virus

Viral Diseases in Human Being

  • Following are the list of diseases caused by virus in Human beings −

    • Chickenpox

    • Encephalitis

    • Influenza (or Flu)

    • Herpes (skin disease)

    • Human immunodeficiency virus (HIV/AIDS)

    • Human papillomavirus (HPV)

    • Infectious mononucleosis

    • Mumps (measles and rubella)

    • Shingles

    • Viral gastroenteritis (stomach flu)

    • Viral hepatitis

    • Viral meningitis

    • Viral pneumonia

Viral Diseases in Plants

  • Following are the list of diseases caused by virus in plants −

    • Peanut - Stunt Virus

    • Maize - Mosaic Virus

    • Lettuce - Mosaic Virus

    • Cauliflower - Mosaic Virus

    • Sugarcane - Mosaic Virus

    • Cucumber - Mosaic Virus

    • Tobacco - Mosaic Virus

    • Tomato - Twisted leaf disease

    • Lady finger - Yellow vein mosaic

Viral Diseases in Animals

  • Following are the list of diseases caused by virus in animals −

    • Cow – Herpes (Herpes virus)

    • Buffalo – Small pox (Poxverdi orthopox)

    • Dog – Rabies (Stereit virus)



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