For some viruses fighting off an infection is easier, if the immune system previously has encountered a closely related virus and successfully produced antibodies against it. (lji.org)
As they are injected into the child, the body system produces antibodies to fight the disease and develops immunity. (momjunction.com)
If you aren't feeling well, remember that as your body produces antibodies to fight an illness, those antibodies go to the baby through your breast milk. (kidshealth.org)