covid 19 scientific facts

Introduction

Viruses are tiny, tiny organisms that infect other cells and use them as hosts. They can do this by attaching to the cell membrane with their viral envelope proteins and then using their own genes to replicate themselves and destroy their host cell. Most viruses don't cause any symptoms at all, which means they're not very dangerous in general unless they get into your body through something like a cut or infected wound on your skin (or mouth). But some viruses cause more serious illnesses like colds or flu: these are known as pathogenic viruses because they can make people sick when they're around us!

What is a virus?

Viruses are small, infectious particles that can cause disease. They are made of nucleic acid (DNA or RNA), protein, lipids and sometimes an outer shell called a capsid.

Viruses are also known as bacteriophages or phages for short.

What are viruses made of?

Viruses are made of a protein called a nucleic acid. The nucleic acids found in viruses are called RNA, which stands for ribonucleic acid and DNA (deoxyribonucleic acid).

How do you get a virus?

You can get a virus by touching something that is infected, breathing in air that is infected and eating food that is infected.

You can also get a virus by drinking water that has been contaminated with human feces, or bathing in contaminated water.

What happens during an infection?

Once the virus enters your body, it immediately infects cells. The virus makes copies of itself and replicates itself to spread throughout your body. The cells infected by this process become activated and start producing antibodies to fight off future infections.

This is how a person becomes sick with an illness like flu or pneumonia: they get sick because their immune system can’t fight off the infection quickly enough or completely enough (and some people have weaker immune systems than others).

What causes the flu season to start and end?

The flu season starts in the fall, when the viruses that cause it appear. It can last from six months to a year and a half, depending on how many people are sick at any given time.

The timing of your flu season is unpredictable because it depends on many factors including weather conditions and how well vaccines work against these viruses. Viruses change each year so they’re not easily predictable; they also spread through the air, on surfaces and by touching someone who has been infected with them (like someone coughing).

How can we prevent the flu from spreading?

The flu is spread through droplets from the nose and mouth of infected people. To prevent this, you can:

• Use hand sanitizer when it's available and wash your hands regularly with soap and water.

• Avoid touching your eyes, nose or mouth with unwashed hands; don't share food or drinks with others; avoid kissing someone who has flu symptoms (this is especially important for children).

Conclusion

Viruses are very tiny, and they can only be seen under a microscope. They can only live in living cells because they need them to reproduce themselves, so it’s important that we all take steps to protect ourselves from getting ill with this type of infection.