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Viruses

✨ Small Cell Pirates

Viruses are microscopic biological entities that can infect living organisms, including animals, plants, fungi, and bacteria. They are much smaller than most cells and are made of genetic material, either DNA or RNA, surrounded by a protective layer called a capsid.

Some viruses also have an outer envelope made from molecules taken from the host cell. Unlike living cells, viruses cannot reproduce on their own because they do not have the structures needed to make proteins and generate energy. Instead, they must enter a host cell and use its machinery to produce new virus particles.

Viruses are found in almost every environment on Earth and play important roles in nature. Some cause diseases in humans, such as influenza, measles, or certain respiratory infections, while many others have little or no effect on people.

The immune system can often detect and eliminate viruses, and vaccines help prepare the body to defend itself against specific viral infections. Scientists also use viruses in research and medicine, for example to study genes or develop certain treatments. Although some viruses can be harmful, they are also part of the natural diversity of life and influence the evolution of many organisms.

💡 Did you know?

The cell battle. When a virus enters your body, it looks for a cell to latch onto. Once inside, it forces the cell to make thousands of copies of itself! That's why you feel tired: your body is using all its energy to create antibodies to stop the invasion.

Invention of the word. Did you know that the word 'virus' comes from Latin and means 'poison'? A long time ago, even before being able to see them with microscopes, scientists knew that something invisible existed that made people sick. They chose this name because they found it toxic for the body.

Microscopic spaceships. Under an electron microscope, some viruses look like small lunar modules or geometric crystals. They have incredible shapes, but they are so small that you could put millions of them on a single pinhead!