They send chemical signals to other T and B-cells to send them into action and orchestrate an organized attack on the virus. T-killers then secret a chemical that kills the virus before it has a chance to multiply. When B-cells receive the signal they start to divide into two types of cells. One type is the B-plasma cell, which produce antibodies. Antibodies are very specific and will match the antigen on only one specific germ, similar to a lock and key.
Antibodies help eliminate germ in many ways.
Within a few weeks of being exposed to a virus, antibodies specific to that virus begin to circulate in your blood and lymph system. They stay in your body for many years to help against future infection by that same kind of virus. They could be likened to spies who learn to recognize a particular foreign substance and remain on the lookout for this invader. The first time a virus enters your body it can take up to a week for your immune system to start to destroy it. If the same virus appears again in the future, the B-memory cells will remember it, enabling the body to produce a much faster and more vigorous immune attack than the first time.