They gave it a name, AIDS, in 1982. In my read of your comment, the claim is they should have, through statistics, been able to draw it back to the food source contamination that is now believed to have been a problem about 70 years prior.
In other words, it can take a long time to notice the correlation. I don't think it's much of a stretch to guess that there could be other such correlations, present and future, that have not been discovered or will take some time to discover.
In other words, it can take a long time to notice the correlation. I don't think it's much of a stretch to guess that there could be other such correlations, present and future, that have not been discovered or will take some time to discover.