Piper,
I am afraid to give you this link, as it comes through daleel's letter in post #3601.
a simple google search for:
than11
turned up scuba gear, pilot, fin air flights with numbers and:
"Technical Barriers to Airborne Anthrax Attack, may be overrated, study suggests"....... It was tested and it works.................
http://www.cidrap.umn.edu/cidrap/content/bt/anthrax/news/bcspray.html
I think that your Norovirus is on the left, there was quite a bit there, but I can't see it tonight.
Night.