The second photo is great! Nice shot, and the bird looks fine. The first one, I don't know. It looks like maybe you snapped the photo while it was blinking, because its eye appears to be shut. If they are ill, I would be about 99.9% sure it has nothing to do with your feeders being contaminated. I would not worry about other birds either, because there isn't much you can do if they are sick.
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