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I live in the Wilamette Valley too and am dealing with eyeworm right now. FYI. I don't know if that is just another kind of roundworm or not. But I do know that it is still there, even after treating with Wazine a week or so ago.
Something to consider is that a quarantine of at least four weeks is usually recommended by folks on BYC. Even then, there are certain diseases esp. respiratory ailments that can be hidden in an individual until exposed to a new chicken. The new chicken gets sick after a few weeks and then some have had to put the whole flock down.
I myself have escaped quarantining in the past with fortunate results, and have read horror stories on BYC about those who weren't so fortunate. If you have a small flock to begin with, you might feel that the extra effort involved in dealing with two flocks isn't worth it. Some have proposed putting a "sacrificial chicken" in with the new chickens to see if it gets sick.
I know you weren't inquiring about quarantine, but I thought I would mention it. Scaly leg and mites would be another thing to search your new hens for. (Also lice.) Look around the vent area and under the wings. If you become itchy after holding them, treat them even if you don't see anything. Mites can take a flock down, as can worms.
I agree with dawg53's advice. Using Valbazen would be off label. I recommend that you do a search on BYC and the web to find out more about it to see if it is best for your situation. I will be going to the feed store today to buy valbazen myself for this intractable eyeworm. I have to save my little roo's eye.
Please especially do a search on BYC for "egg withdrawal" times of ALL medications you give your flock. The wormers are usually a couple of weeks but do your research first and toss those eggs, as feeding them to the flock will give them more wormer.
