When your young birds have the virus Walter the total complection of the bird, indeed sometimes the whole team, changes? A bird that you are selecting for a race, bearing in mind the whole package of things that you are looking for at basketing, will tell you what kind of nick it is in. The wee burl doon to the club room with a bird that then chucks up a wee bit feed is not the panic button in my opinion. Yes you are bang on that SICK birds should not be basketed but a little bit of faith in your fellow fancier to be able to tell the condition must be levelled first I think.