The subject contracts 1d3 diseases, which strike immediately (no incubation period). You infect the subject with any disease allowed by the GM, though a Fortitude save is allowed for each one. For the next day, if uncured, all living creatures that come within 20 feet of the plague carrier must save against each disease he carries. The individual disease, not the spell, affects those failing their saves in this case. In order to rid the victim of this curse, each disease must be individually cured by magical means.