a guy i know had sickness a couple of weeks ago, he missed 1 race then send the next week and only had 9 from 22 home at 100 mls. i said to him, his birds had still not recovered from sickness. he was saying they were and were flying well(his club mate who he trains with also had ybs and like him thought it ok to send and lost a load). he showed me his birds and i noticed 1 hen feeling sorry for herself and pointed it out to him, he said she was his first bird back, so i said she obviously not recovered. the both guys have had birds for years and should know better