Don't worry, it should be. Your epidermis is the top part of your skin, and your skin is your body's largest and fastest-growing organ. Skin is your body's coat. It protects you. It helps you stay warm when it's cold, and cool when it's hot. Your skin keeps all your insides in, from your heart and lungs to your blood and muscles.
In the other population of cells, the injected phage chromosome turns OFF all the phage genes except one. The single phage chromosome called the prophage now becomes a part of the host chromosome. The bacterium carrying the dormant phage chromosome is called the lysogen.
The definition I found for Provirus: a viral genome that has inserted itself into the DNA of the host (bacterial) cell. The definition for Prophage: The latent form of a temperate phage that is remaining within the lysogen (infected bacteria) and is integrated (inserted) into the host chromosome.