Can a virus cause disease?

Yes, a virus can cause disease. Viruses are infectious agents that can cause disease in both plants and animals. They are made up of a protein coat that encloses a core of genetic material. Viruses can only reproduce inside the cells of living hosts. When a virus enters a host cell, it uses the cell's machinery to make copies of itself. These copies can then infect other cells, causing disease.

Viruses can cause a wide range of diseases, from the common cold to more serious illnesses like influenza, measles, and AIDS. Some viruses can even cause death.

The symptoms of a viral infection can vary depending on the type of virus. Some common symptoms include fever, chills, body aches, fatigue, sore throat, cough, runny nose, and diarrhea.

There are no specific treatments for most viral infections. Treatment typically involves relieving symptoms and preventing complications. Some viral infections can be prevented with vaccines.