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I had thought that any question tagged untagged was as a result of migration. But What happened to the village in Contagion? was not migrated from anywhere as far as I can tell, so how did it end up untagged? Perhaps it was asked by someone with tag-creating rep, but after a long enough time with only one question, the tag went away? What are the various ways that a question can end up tagged as untagged?

Also, can a tag be added to such a question, or must untagged be removed when another tag is added?

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As far as I'm aware, a migration cannot occur if it does not have at least one tag that's present on the target site. – animuson Feb 17 '13 at 0:38
    
@animuson is correct. Moderators, however, can migrate anything to any site regardless of applied tags, provided that the question itself is not too old to migrate - so it's always good to check the question history to be sure. – Tim Post Feb 17 '13 at 1:32
up vote 8 down vote accepted

Tags that only exist on one question are automatically removed after 6 months. As well, tags are sometimes burninated through Meta discussions. If the tag was the only one on the question, these actions will leave the question .

You should periodically check for untagged questions and retag them (or close/delete them if necessary).

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