Oh, no! A lurgy is a kind of disease of the spirit. An infectious mood, I suppose you could call it. There are lots of different kinds. The celebration sort isn't too bad. All that excitement! All that kissing! They pass very quickly. But if you've got one and you get hit on the head, or, say, shocked all of a sudden, they can stick.
I'm always careful about kissing at holiday parities, anyway. Mistletoe and nargles are a different thing, but you've still got to be careful!