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depends on the vaccine and how deep you look. If you just look at the package inserts, then they all show titres. If you look at clincicaltrials.gov and on google scholar you can find higher phase and bigger studies that are observational and look to see, for example, pertussis numbers in the group given singles v the group given the larger combo.
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And these observational studies would be dependent on each subject's individual exposure, which is unpredictable and impossible to confirm (in kids who don't obviously contract the disease.) Sure, you can watch who develops symptoms and who doesn't, but lack of symptoms does not confirm exposure or lack of exposure. (Gosh, I hope that made sense.)
I just don't see how anything more than weak conclusions or educated guesses can be drawn from these types of studies. To me, the only way to study and confirm vaccine efficacy would be to vaccinate, then purposely expose the subjects to the disease. Unethical, of course, but without it we're not relying on accurate, complete information. And the only way to confirm vaccine safety is to perform a long-term study comparing vaccinated vs. non-vaccinated...an important study yet to be done.












since I didnt know about the eggs.