Okay, first I have to put a "this is what I've seen and heard/your mileage may vary" disclaimer on this - other people may disagree! The character I currently play in the game isn't one for getting super-involved by nature and that's colored my experience at this game, although that might finally change in the future (in part due to echoing back her medical background, incidentally).
As far as I know we have one or two healers and a couple doctors, most prominently the ones at the LSR clinic. The clinic's a pretty important place to the network folks in general, so if you've got a place there chances are there's opportunities for involvement. I'm less familiar with the healer/battle-ready medic types, but I know we have at least one or two and they've been involved in stuff like sewer exporation and the farmhouse battle towards the end of Season 1. So while I can't definitively give you an estimate on the difficulty I don't think it should be hard finding plot opportunities!
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As far as I know we have one or two healers and a couple doctors, most prominently the ones at the LSR clinic. The clinic's a pretty important place to the network folks in general, so if you've got a place there chances are there's opportunities for involvement. I'm less familiar with the healer/battle-ready medic types, but I know we have at least one or two and they've been involved in stuff like sewer exporation and the farmhouse battle towards the end of Season 1. So while I can't definitively give you an estimate on the difficulty I don't think it should be hard finding plot opportunities!