There are just too many players in medicine, epidemiology, pharmacology to hide such things on the scale you suggest. It cannot be possible. These people are real people, just like you and me, and most of them have devoted their lives to trying to either keep people healthy or search for cures from diseases. So suggesting they are all colluding to hide major side effects which are seriously injuring major numbers of people from over 40 years of MMR is in my opinion frankly ridiculous, and also rather offensive.
It is possible.
"A pooled weighted average of 1.97% (N = 7, 95%CI: 0.86–4.45) of scientists admitted to have fabricated, falsified or modified data or results at least once –a serious form of misconduct by any standard– and up to 33.7% admitted other questionable research practices. In surveys asking about the behaviour of colleagues, admission rates were 14.12% (N = 12, 95% CI: 9.91–19.72) for falsification, and up to 72% for other questionable research practices. Meta-regression showed that self reports surveys, surveys using the words “falsification” or “fabrication”, and mailed surveys yielded lower percentages of misconduct. When these factors were controlled for, misconduct was reported more frequently by medical/pharmacological researchers than others."
Edited by Bokonon - 10/30/12 at 9:00am