Viruses are harmful to us. The first thing that we should know about viruses is that they don't have a physical form. They are very tiny particles that are about as big as bacteria. The only reason that they are called viruses is because they are really very small. They are too small to be seen with the naked eye. Viruses don't have a single shape and they aren't a single color.

They come in different sizes and colors depending on what type of virus you have. They also change shape and color as they change forms. This is because they change from one form into another form. Viruses attack our bodies and destroy virus our health. They are present in every part of our body. They can enter into our body through the mouth, nose, eyes, vagina, rectum, urethra, skin, blood, or by being inhaled. They travel around the body and look for a place where they can nest.

They usually attack our organs, such as the lungs, heart, liver, and pancreas. Viruses are really difficult to get rid of. Once they enter our body, they begin destroying our cells. The body responds by creating an immune system. But it takes a long time to develop and protect itself against the harmful viruses. Sometimes, our immune systems can't work properly.