FIrst the virus enters the body, either via the nose or mouth or through a cut.
Virus
cell
Then the virus targets a cell
After it targets the cell it dissolves, it uses the cell and makes it create more viruses of itself, once the cell can hold no more ciruses the cell burststhe viruses then seek out new cells.
The virus can pass to a new host through many ways, including, sneezing, coughing, in some cases skin contact and contact with contaminated blood (i.e. HIV)