Quote:
Originally Posted by cheerfulgreek
I don't think vaccines are the end all be all though. Viruses can eventually become immune to the vaccine. I'm not an expert on human health, but I know animals to some degree, (I still have 3-4 more years of school left   ) and animals and humans are similar in some ways (why do you think mice are experimented on). Like in cats for example. I don't know all of the vaccines used for cats as of yet, but I do know that there are several types of vaccines in use. Unfortunately they don't always work, which can sometimes be the case in human beings too. Sometimes it can be due to improper handling and storage, incorrect administration, or an inability of the cat to respond to the vaccine because of a run-down condition or concurrent illness that stress the immune system.
If given too many vaccines at the same time or too frequently, it can cause an immune system overload and a failure to produce antibodies. Also, we have to remember that in humans and animals, if already infected, vaccinating him/her will not alter the course of the disease.
I'm sure this is similar in people, though I could be wrong but when stretching out the vaccine by dividing a single dose between two cats, is another reason a vaccine may not be effective.
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Remember viruses are not live independent organisms. They do not have immune systems. What happens is they mutate virion stage before shedding. For HIV and many other lenteviruses, the reverse transcriptase is a infidelity enzyme and fails to keep normal code stick inosines rather than A/U's at the sequence. That is why the genetic sequence is mutated in HIV. The infectiousness of HIV is thought to be mandated by the gp130, the main protein that binds the CD4+ cells--apparently at the TCR for T-cells or APC binding site in Macrophages.
And children's immunity is boosted upon injection. It is different when the ACTUAL vaccination agent is causing the problem (which is highly unlikely) and the nonactive ingredients, such as over-sulfated chondroitin--which causes more problems than needed.
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