fanciers wil rather spend hundreds of pounds on treatment they actualy think its cheaper than going to a vet , i feel if more went to vets they would save far more and not need birds proped up with a pill bottle , the problem is this weak birds wil get sick yes you can cure thembut the same bird will bring the rest down later on and is ineffect a gateway for sickness to come into the loft P.M.V Vaccinne does work but only to a certain degree and from recent out breaks last year it is either ineffective or there are those out there that flaunt the rules , i wouldnt say most problems are down to .pm.v .vaccine just fanciers filling there birds with medicines they dont need then when it come they have a problem that requires an over used medicine it becomes ineffective then you have real problems