Do you have the tube it came in @Jemima Duck ? I would do a flush just to be on the safe side.
https://www.backyardchickens.com/threads/flushes-for-aiding-in-toxin-removal.700526/ Put it in their drinking water and for which ever one you use be sure to follow directions completely.
https://www.backyardchickens.com/threads/flushes-for-aiding-in-toxin-removal.700526/ Put it in their drinking water and for which ever one you use be sure to follow directions completely.