Hi Tom. Was talking to a club member who said the jagging with pmv is causing major problems. Not the vaccine but all pigeons being jagged at different times is spreading illness. The first two weeks racing with youngbirds is fine but come the third/fourth week your birds lose form or become ill did the members who jagged there birds the week leading up to the first youngbird race spread (a form) of pmv into the race basket even to birds already jagged ?????? He said it never happened when all the members took there birds to the club and were all jagged at the same time. three weeks before the first race. Are guys creating a super strain of pmv infection by jagging on a weekly basis as the birds leave the nest then are added to older youngsters who have not built up the correct immunity ??? just a thought!!!