So a virus may be engineered for some useful purpose, but spread to organisms that were not intended to get it, and mutate to a dangerous form.
So engineered viruses are used in secure laboratories, with great care take to ensure that they cannot leave.
Influenza virus (flu)rhinovirus (common cold)human immunodeficiency virus (HIV)Read more: What_are_some_viruses_that_are_harmful_to_humans
useful effect viruses
Viruses and some bacteria aren't useful.
None
Its useful to see very small microorganisms & useful to study about small viruses etc.
No
no it usually isn't and it can cause viruses to your computer
Introducing mutations into the bacteria is called "engineering" the bacteria. it allows bacteria to be developed that can be put to work for useful purposes (devouring oil spill gunk, as one example), and there are hundreds of other uses for engineered bacteria, too.
Prediction.
Topaz is used for decorative purposes.
10
yes they do