Read about that here. Antibody is a fancy term for the parts of your immune system which handle bacteria, parasites, viruses, germs, fungus and other assorted bad characters. When your body is healthy your immune system should handle any germ without need of antibiotics. Colostrum is mother's milk during the first few days of breastfeeding. That is a dangerous lie.
Babies are at risk when the antibody defense system is weak.
It turns out, that people who are often sick, don't have the antibody they need or that the antibody couldn't recognize the invading bug. You may need what is contained within colostrum to fight every germ you ever have invade your body.