Watery eyes can be common with fowl pox, and it's different from a respiratory disease where you have carriers. Fowl pox comes directly from mosquitoes. If you live in the south or in a tropical area, pox is very common during hot weather. As long as yours don't develop wet pox, they should recover and be immune to that particular strain of pox in the future. In areas where pox is prevalent, vaccination of new chickens may be done.