I had to laugh at this one. I got a picture in my head of a destroyer tracking a sub and the sonar operator saying to the Captain "I think we've found a new class of sub, listen to this" and the captain hearing "Achoo, cough cough, achoo, cough" on the headset. "Those damn Russians have a new secret weapon!" #:-)
I suppose it could really cause big problems as some of the flu bugs going round these days really do screw people up.