A neighbor used the generic stuff from the feed store and had a horrible outbreak of pinkeye. The stuff we use is Maxiguard from Addison LabsBigfoot":5vw0qm93 said:I vaccinated 150 stockers with it, and well over half ended up with it. That was a few years ago. I gave up on it after that. Since joining the forum, I have gathered that some vaccines may be regional, and work better. An eye swab may even indicate which strain you have, and work a lot better. I meant to look in to that, and haven't yet. I had a bad outbreak last year. I spent over $1500 treating it. I'm glad you posted, because I need to call my vet.