A new hen in my flock died very rapidly with very little symptoms and after sending her off for a necropsy it came back either Lymphoid Leukosis or Mareks . My flock was only around her for a few days in a free range situation but obviously still in contact with her. The hen that died was 2yrs, my hens are all 3yrs other than one that is 8 months. I know that Mareks is highly contagious but am curious on how contagious LL is. Also if since my hens are older if they have a fighting chance at not getting this. I would love to hear from anyone with experience on either of these. For having a small backyard flock that has been disease free for the last 3 years this definitely is a punch in the stomach. And a reminder to do adequate quarantining of new flock.