Active Viruses - enter a cell and reproduce right away. The nucleic acid of the virus injects itself into the cell. The cell breaks open and releases hundreds of new virus particles. Latent Viruses a. This DNA becomes part of the cell DNA and copies itself when the cell divides.
Latent viruses can hide inside host cells for a long time and then all of a sudden become active.
Stress factors such a too much sun or cold may cause a virus to become active. G. Examples of Viruses HIV, Coldsore, Flu, Measles, German Measles, Smallpox, Polio, Rabies, Mumps, etc. There are no medications to cure viral diseases. Some viral diseases can be prevented by vaccines. Vaccines inject dead or weakened particles which cannot cause disease anymore.