I had one 4 week old Light Brahma chick die recently of cocci. Her clutchmate came down with it two days later, so I started her on a Corid. This all happened after their first two days of getting to go play outside. They are fed non-medicated feed. Before she showed any symptoms I relocated the remaining Light Brahma chick into a enclosure containing five, two week old chicks so she wouldn't be alone. So... they have all been drinking the medicated water for seven days. My question is, if the younger chicks were exposed to cocci during this week of treatment, is the seven days enough? Or should I continue on for longer? If I need to continue, how much longer should they be on Corid? Thanks in advance for any advice!