It says it's a virus on the special issue page:The New California Republic wrote:I don't think it has been officially said as part of NS lore that it involves a virus. It could be bacteria, a fungus, etc.
Recent reports suggest the existence of an infectious virus causing its victims to display aggressive, flesh-eating behavior. The virus appears to spread via the exchange of bodily fluids, such as biting.
Incidentally, I couldn't find the link to that issue page on http://www.nationstates.net/nation=trotterdam?zalert=1 (Antiquity theme). Will this be a problem come the actual apocalypse?
Also by my own analysis, the real-life disease most similar to zombieism is rabies, which is indeed a virus, though very a different one from COVID which is actually a relative of SARS.
Making it opt-in would significantly affect game balance. Currently, inactive nations that don't bother to respond to the threat serve a major role as a breeding ground for the virus, making things harder for other members of the region that are trying to research a cure - and even with that, we're frequently able to pull through. If only nations that are actively trying to do something about it get infected, the game would probably be trivially easy, at least in regions with closed borders. (In regions succeptible to zombie raiders causing trouble, the game was conversely criticized as year as too heavily favoring the zombies.)The Free Joy State wrote:If a solution is felt needed, making it opt-in seems ideal to me -- that way, people who do not want to be part of a game that involves a disease (whether viral, bacterial or a pathogen) can enjoy the other parts of the site, and those who are looking forward to Z-Day can still enjoy it as in previous years.