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I know that there is a variable region on antibodies which can recognize a wide variety of antigens, and that germinal centers create more "fit" antibodies to respond to an infection.

So I was just wondering:

  • Does this process itself evolve? Only vertebrates have this type of immune system if I understand correctly, do we actually get better (faster/more efficient) at responding to disease?

  • Is there any antigen which antibodies don't recognize?

  • Can an organism be so efficient at this process of immune response, that it essentially never gets sick or dies of disease?

  • There are cases where organisms contain viruses which do not harm them. Could an organism have this relationship with all viruses? As in, no virus is actually a disease to them?

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closed as too broad by WYSIWYG, AliceD, Bez, Susan, rg255 Dec 5 '14 at 11:41

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

  • $\begingroup$ Your question(s) is too broad. You should narrow down to a specific point. $\endgroup$ – WYSIWYG Dec 5 '14 at 8:03
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This is a pretty broad question, but I will try to give an answer:

This process will undergo further evolution over time, no question. It has evolved into the current state and there is no reason to assume that this ended. When there are mutations which prove advantageous, they will evolve. This may also involve a faster response time for example, but we can of course make not definite claims about it.

There are antigens which are not recognized by the immune system, the process is called molecular mimicry. In it, microorganisms mimic molecules or structures which are found inside the body of the infected person and which are therefore not recognized by the immune system (if the immune system recognized self-antigens, this leads to autoimmune diseases). Have a look at the references 1 and 2 for more details.

This is a rather theoretical question. Our immune system is really efficient in clearing potential threats before you get a real infection. You can see the difference when you compare healthy individuals with persons which are immuno suppressed because of a transplantation. These persons need to be very careful about their environment in avoiding the exposure to potential pathogens. And they easily get infections. Additionally microbes evolve to evade our immune system. So I think the answer here is no.

These are viruses which co-evolved with the organism, an example would be the ebola virus in certain fruit bats. Here it does no harm, while it is a big problem for humans. As there is a really, really big number of viruses available in nature, it is quite unlikely that we learn to tolerate all of them. Additionally viruses mutate and change over time, so we would have to learn again to live with them.

References:

  1. Molecular mimicry
  2. Molecular mimicry and immune-mediated diseases.
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