NanoViricides Inc. (NNVC)

[changes_iv]

But then...viruses that kill their infected host cell are called virulent. The DNA in these type of viruses reproduces through the lytic cycle. When these viruses reproduce, they break open, or lyse, their host cells, resulting in the destruction of the host. The whole cycle can be complete in 20 - 30 minutes depending on a variety of factors such as temperature. Phage reproduction is much faster than typical bacterial reproduction, so entire colonies can be destroyed very quickly.

http://biology.about.com/od/virology/ss/Bacteriophage.htm