Tommy finally cruises up to a macrophage that shows him a piece of a cold virus. He checks it with his receptors. It's a match. Right away Tommy leaps into action. The virus has only been in the body for 5 minutes.
Antibodies are like heat-seeking missiles that zero in on a particular virus and kill it.
Tommy also calls in a SWAT team of killer T-Cells and together they go out in search of the invader. They are some of the fastest dividing cells in the body. One day Tommy is cruising the body on his usual rounds when he meets a thug in a black leather jacket, an AIDS virus. He decides to check him out with his receptors, but before he can do anything, the little creep gets right inside Tommy through a tiny hole near the handle that Tommy uses when he visits macrophages. Viruses don't usually attack T-Cells but AIDS does.