D&D 3.0: Tales from Mystara
The mau-mau mosquitos’ bite turn victims into zombie-like creatures. The mau-mau fever is a heavy sweating, pale skin and skin rashes; St, Co, Ch -3. Death if not cured in a month.
Aloysius Island is the known source of the mau-mau mosquito and been on the island is a 1% cumulative chance of acquiring this disease per week of exposure. An epidemic lasts 1d6 weeks.