Question

How do viruses cause diseases?

Answer 1

Viruses cause familiar infectious diseases such as the common cold, flu and warts. They also cause severe illnesses such as HIV/AIDS, smallpox and hemorrhagic fevers. Viruses are like hijackers. They invade living, normal cells and use those cells to multiply and produce other viruses like themselves.

Answer 2

Viruses are particles of nucleic acid with a protein coating. They inject the nucleic acid inside the cell then copy the DNA of the cell