Question

how do virus 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

When viruses enters in our body it cause our immunity weak so it causes diseases.

hope this may help you....