Immune Response Body Defenses For Common Cold
  Immunity created by B cells help with immune response-body defenses for common cold. The B cells, meanwhile, also have been activated by contact with the big eaters. They are stimulated, with the instance of helper T cells, to produce millions of antibodies, the immune system’s most sophisticated killers. Antibodies sabotage the invading viruses’ weapons, neutralizing the parts of the virus surface that enable the virus to hook onto and enter a host cell. With its attachment sites blocked, the virus is no longer able to invade and take over the host cell.
Antibodies are tailor-made to block the activity of each of the countless different foreign organisms a human may encounter throughout a lifetime. All antibodies have the same basic structural features four chains of molecules arranged in symmetrical pairs of two light chains and two heavy chains, the whole assemblage joined by a pattern of molecular bridges.
Within this basic pattern, a huge number of variations of molecular components occur, making it possible to match an antibody to almost any invader. Scientists at one time believed that, in fitting perfectly to a single virus, each antibody was totally effective on that virus but of no effect at all on any other.
Recently, however, it has become clear that antibodies have relative degrees of affinity to viruses sharing some structural similarity. Thus, not only can an antibody totally block a virus that has made a return visit, but it may also be able to partially block others belonging to the same family of viruses. The reality is that immune response-body defenses for common cold need to be driven from the
In addition to neutralizing a virus’s ability to attach itself to a cell, an antibody also contributes to making the invader more susceptible to the scavenger white cells. After an antibody has coated a virus, another part of the antibody surface becomes receptive to the blood substances that are known collectively as complement.
Complement includes 11 different compounds that zero in, one after another in a precise sequence, to hit the viral target, where they assist the white- cell scavengers by attracting them to the virus or by helping to destroy the virus.
The combined responses of generalized and specific immunity all work to bring infection to an end. The T cells do much more of this work than the B cells, because they go into action soon after an infection takes hold. The B cells are less effective against a cold because their action depends on the production of antibodies.
There are so many types of cold viruses that a person could go on having one type of cold after another, building a reservoir of antibodies in the process, without ever becoming infected with the same viral strain twice. Besides, the production of enough antibodies to end a disease takes about 14 days, by which time the cold has generally been cured by the other immune responses.
However, antibodies produced by B cells in an earlier cold have a very important effect they account for, in part, all the weeks and months of good health experienced before the current cold was caught. The antibodies produced too late to help cure an earlier cold have been providing immunity to that kind of virus ever since. The antibodies being produced too late to help in a current cold will do the same for the future.
Thus, if a husband gives his wife a cold, he need not fear catching it back from her he is immune to that virus, thanks to the work of the B cells’ antibodies. In addition, the older an individual gets, the more kinds of cold viruses he is immune to and this helps with immune response body defenses for common cold.
This conferring of future immunity may be extremely important in keeping the prevalence of colds to its present levels—rhino viruses are a major cause of colds, and immunity to one of the 100-plus types of rhino viruses may mean partial immunity to others, since antibodies are now known to be partially effective against related viruses as well as 100 per cent effective against the target virus.
Some people have immune systems that are less than ordinarily effective, and as might be expected, they suffer extraordinarily from colds. And some studies indicate that people with chronic lung ailments such as bronchitis catch cold easily. Most other aspects of physical condition do not seem to have much effect on vulnerability to this illness; there is no evidence to indicate that vigorous athletes are any less susceptible than people who are chronically ill with heart disease or diabetes. |
