I'm not sure if this is the correct forum for this, nonetheless, my question will not contain any spoilers. Who do I get vaccinated? The quest marker above the dude's head is greyed out. Do I need to be a certain level before I can undertake this mission?
This has happened to me
Characters may only have 25 active quests at a time, once you hit 25 active quests - all quest marker will be greyed out. If this is the case, either complete your active quest or abandon some quest.