There is also an article in Advanced Aquarist that discusses recent research on the relationship between temperature and disease transmission. This is a quote from the article.
"In experiments of disease transmission at differing temperatures it was found that no symptoms appeared after inoculation at 20 and 25°C after 20 days (68-77°F), but that 100% of the tested fragments showed disease and died at 27 and 29°C (80.6-84.2°F) after just 16 days (the rate was slightly faster at 29°C than 27°C). "
http://www.advancedaquarist.com/issu...2002/media.htm