I recently bought a Mareks vaccine to vaccinate some chicks that I bought at my local feed store. I thought I had done all the research I possibly could about this, but my vaccine came with diluent in an IV type bag, and I can't figure out where to stick the needle into the bag. All the instructions I've seen online, as well as the instructions that came with the vaccine, describe using a bottle of diluent, not this bag. I tried uploading a photo of the bag, but it went into some sort of community group of photos and I couldn't figure out how to attach to this message. There are two possible openings, one with a hard rubber stopper, but when I stuck the needle in there I couldn't draw anything out. There's a longer opening with a removable blue cover, but when I took the blue cover off and stuck the needle into the bag, it created a hole (duh), and I think I wrecked the entire bag and made it non-sterile. I'm ready to throw the entire thing in the garbage and take my chances with Mareks. If anyone has any experience with this IV bag type diluent, please let me know. I haven't ruined the vaccine itself (yet), so I can order another bag or bottle of diluent and try again.