The Flight of the Sun
The disease is highly contagious, and usually deadly. The elves – the untouchables – are the primary carriers. Any contact with their skin demands (a very high DC) constitution check.11
Healthy humans, gnomes and dwarfs who fail it develop a fever within 24 hours. Less then 5% of those infected survive this, but the ones who do become untouchables themselves.12
While the elves are able to live many years – even breed – when infected, member of other races do not survive longer than few years.