If we look at the current virus outburst as a whole, variants of the three main virus families (Bagle, Mydoom and Netsky) have been released in three bursts: first in the end of January - this is when the infamous, SCO-attacking Mydoom.A was released - then in the middle of February - when first Netsky was found - and then in the end of February. This last burst is still continuing, as can be seen from the table below.

The different virus families are colour-coded.