Recurring infection mystery

[HunterImagery]

    So I have this recurring infection that pops up every few months on either their eyes or around their nose.  Strange part is that I have 10 goats who all live together and the only ones who get this are all from the same generation. Nobody else in my herd ever shows even the slightest sign. I’ve had them tested for orf  which came back negative. Any ideas or experience with this? Thank s.