I remember that my server - Emerald Dream EU - avoided having an outbreak for quite a long time. We knew what the problem was, and somehow it took a fair few hours for the first idiot to come along and do it for the lulz, before that everyone agreed to not carry the Blood Plague outside.
Once it happened, it was only 5-6 hours to the downtime where they fixed the bug, but it essentially depopulated the major cities, anyways.