Virus and Bacteria

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Virus and Bacteria

Virus - A virus is a capsule of protein that contains genetic material. A virus cannot reproduce on its own; it must infect a living cell to grow.

Bacteria - Bacteria are one-celled organisms that live on their own. They can multiply and reproduce by subdivision

Bacteria and viruses cause many of the diseases we are familiar with and may sound synonymous; they are greatly different from each other.

[pic] o They differ greatly in size. The biggest viruses are only as large as the tiniest bacteria. Viruses are microscopic; they range in size from about 20 to 400 nanometers in diameter (1 nanometer = 10-9 meters). By contrast, the smallest bacteria are about 400 nanometres in size. o Another difference is their
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The ways in which a bacteria can get access to an animal body are: • Cuts • Contaminated food or water • Close contact with an infected person • Contact with the faces of an infected person • Breathing in the exhaled droplets when an infected person coughs or sneezes • Indirectly, by touching contaminated surfaces - such as taps, toilet handles, toys and nappies.
Viruses are spread from one person to another by: • Coughs • Sneezes • Vomits • Bites from infected animals or insects • Exposure to infected bodily fluids

Curing a bacterial infection

The body reacts to pathogenic bacteria by increasing local blood flow (inflammation) and sending in cells from the immune system to attack and destroy the
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