They don't seem to encourage that much any more, probably so as not to raise false hopes in people who have already suffered considerably.
I read carefully about the Lourdes miracles; many are well documented, and I don't remember anyone other than French and English nationals, maybe a German or Swiss, being cured which I find a little odd. There was not one American in the lot, although a friend told me a strange story about their dipping an American's hearing aid in the water and hearing was restored through the use of the aid. Evidently American hearing aids can be cured :-).
I don't know what to make of it any more. There is no doubt that cures have taken place there, but they are very scanty in proportion to the enormous number of sick pilgrims who go there. There was an American couple (catholic) who borrowed on their life insurance to take their son (can't remember exactly what his problem was - cerebral palsy I think). He was not cured nor was there much, if any, improvement in his condition.
One wonders, in hindsight, if powerful psychological mechanisms kick in in some of these cases due to hopes and expectations. The more we know the less we seem to know and understand.