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Respiratory system

The system of organs including the nose, mouth, trachea, bronchi, bronchioles and alveoli through which air is taken into the body

Genetic engineering

A general name for the processes which scientists use to produce desired characteristics or substances that are in short supply, such as human insulin.

Viruses

The smallest of living organisms. Viruses are made up of a ball of protein that contains a small amount of the virus DNA. They can only reproduce after they have infected a host cell

nanometres

0.001μm

Influenza

A viral infection of the breathing system which attacks the lungs and can be fatal

Viruses

Viruses are very tiny – they are much smaller than bacteria or fungi . They measure only a few thousand millionths of a metre (nanometres).

All natural viruses cause disease including the common cold, influenza (flu), measles, mumps and rubella. They are not living cells themselves, and they can only reproduce inside other living cells.

Viruses can attack all different types of living organisms – they invade animal, plant and even bacterial cells. Different viruses attack specific cells – so the 'flu virus attacks the cells of the respiratory system while the virus which causes meningitis attacks the cells of the membranes which cover your brain.

Scientists have started to use viruses to benefit people. They are an important tool in genetic engineering. They are used to carry new genes into the DNA of the cells of other organisms.

The flu virus

The flu virus
Photo provided by CDC/ Dr. Erskine. L. Palmer; Dr. M. L. Martin

In the Disease resource, you can find out more about flu, chickenpox and HIV/AIDS, all viral diseases.

The structure of viruses

  • Protein coat
    this attaches to and penetrates the host cell. It surrounds and protects the genetic material
  • Genetic material
    This can be DNA or another similar chemical called RNA. It contains the information needed to take over the host cell DNA and make new viruses
The structure of a virus

The structure of a virus