if a virus destroy the bacterial cell what would happen if a virus invades other cells? How would this cause disease

Viruses are perfect parasites. It has been known for decades that once a virus gets inside a cell, it hijacks the cellular processes to produce virally encoded protein that will replicate the virus's genetic material

At the beginning of an infection, the virus' DNA or RNA gets injected into a cell (a human cell, if the virus infects humans, or a bacterial, cell if the virus infects bacteria). Afterward, the virus reprograms the cell to make lots of copies of the virus. Eventually, these copies are packaged into new capsules. These cells then attack the body after forming millions of cells thus leading to a disease.