I was not aware of this until I checked mine health status yesterday. While doing Hole in wall quest at Vault 81 (long time ago), you shall save a boy named Austin. Same place you meet Curie. I did a forum seach at FO Wiki and it seems like if you have companion with you or someone else present - if they being bit and not you, you get the disease as well. The disease damage your health with max -10. It's permanent so you have to choose, you or the boy. I saved the boy. Some npc during MQ will ask you if you have been bitten by something and got a disease. Myself did answer "no" to these questions because I was not aware. So, since this is a known "bug" I did player.additem 00055F10 and I got 1 extra cure. Maybe Bethesda should make a fix for this also for those on consoles. Let's say add a minor questline that makes another cure available.
Cheers,
-Klevs