Claire's illness trigger

[olympia325]

Is it scientifically and medically possible to trigger an illness in someone from a considerable distance? Ben mentioned that Claire's illness was triggered and would take 4 days to appear. Was the trigger initiated from Othersville or could it have been someone at the Lostie camp who say, injected Claire with something to trigger her illess? If it's the latter, it brings up interesting questions about a mole in the Lostie camp..