Hi Nasher,Be very clear here, you have to understand the information before having the information is worth anything at all. No-one can make this decision for you; that's why I gave you all that homework! What I've suggested to find out, is neither difficult nor will what you find, be beyond your interpretation. Or, you can post it in this thread and let brethren with a better grasp of medical research techniques and statistics, interpret the broad meaning for you.Alternatively, you could spend as long as it takes asking the Lord whether to let your son have the MMR, (waiting until you have the answer, of course) and then, just do it, trusting the outcome to the Lord. The thing is, depending on who's doing the research this can affect on the outcome.That is why I wanted you to search out the credentials of the person who did the original research, so you can find out if it meets the stringent standards required generally...? The same goes for researchers in other countries who came to different conclusions. Somewhere along the line, this question has got to leave you better educated.... and I mean that in the best way. Many of us have already been through this hoop (a few times) but, we cannot take your parental responsibilities for you. You have to grow through this with your little boy. This is only one of many similar decisions you will have to make - to say nothing of the MMR booster before school.Have you considered the implications of allowing your son to contribute to the dwindling pool of 'herd' immunity?What does this mean?'Herd' immunity, is what Public Health call the cumulative effect of successfully vaccinating the vast majority of people in a certain risk group - in the case of your son, small children. Ideally, they are looking for above 90%. It varies slightly for different illnesses and some viruses have a number of strains. For instance, there are over 80 strains of whooping cough (also called 'pertussis'), which circulate the world in a four year cycle of being particularly nasty.Therefore, if herd immunity begins to dip down below 90%, more and more of the children who have not been vaccinated, will pick up something. Then, once they've been ill with one thing, they are weaker, so they may be more vulnerable to another infection before they have fully regained their strength. (With measles (as you probably know), middle ear infections are a common secondary complication while the measles is still in progress.) While you only have one child, this is not a disaster, but, if you have more than one and the well one is not allowed to mix with other children until it is clear he or she is or is not going to pick up the infectious disease, then you may be talking about keeping them off school for 2 weeks or more - when they are still WELL. (Quarantine) If they become ill (which would then be considered a happy occasion because it brings the uncertainty to an end) everyone knows where they are in the scheme of things. Then there is a strange condition known as 'immune carrier' which means that a person who is not ill with an illness can still pass it on to someone who is not immune. Mumps can be passed this way, I believe.Lastly, the reason rubella is so disliked by professionals, (seeing it is a relatively innoccuous condition for the person who has it), is that anyone pregnant and in contact with it during the first 3 months (the time you're not always sure you're pregnant - or for that matter, the other young mothers you know), is at risk of bearing a child with hearing and seeing difficulties such as deafness and blindness (and both of those together).Is there any history of autism or dyslexic spectrum difficulty on either side of your son's family? None, but what difference does that make?There is a genetic factor, so, if there was already a risk, you might be able to convince yourself that it could be worsened - that is, if you believe the original research.NB I am not saying there are no risks to vaccinations but, MMR has been considerably improved since it was introduced, and children who are in good health should be able to cope with it. However, for the people who have any sort of reaction, I agree, it is a personal disaster for everyone who is affected. But, you do need to understand the information which is available - unless you let the Lord be your Guide without the 'information'.19.38h Capitals removed at Nasher's instigation.