Immune System
If a person has a common cold, the human body will release antibodies to fight the cold virus. Antibodies are part of our immune system that fights bacteria and viruses that are harmful. These antibodies are made by white blood cells. Sometimes they are called B cells. The unique thing about white blood cells is that they can detect which cells are carrying harmful bacteria and viruses. The more quickly these cells divide, the sooner your body can fight the cold. A strong healthy person's body will have more whiteblood cells to attack the flu virus or some other illness. But sometimes this attracking process does not happen quickly enough, so we need to go to the doctor to get some medicine.