I have NEVER had a sick duck, never. well, not disease sick, injured sick, I've had, but I've never had a problem with URI's or anything. so in the chick room recently, they had an outbreak of URI from the older chickens, well, a couple still have some snuffles. I was thinking of medicating them with Sulmet,wich worked for the older chickens, BUT the ducks are the problem, I don't want to overdose them. so what are the chances of the ducks even GETTING a URI???, none of the ducks got sick when the chicks got sick, so what are the chances now? if there something safe that ducks AND chickens can have??