"Ordinary flu viruses spread when an infected person coughs or sneezes, blasting out tiny droplets carrying the germ to others. For that to happen, the virus has to be perched in the right places to be ejected by a cough or sneeze. The new work suggests H5N1, by contrast, infects humans too low in the respiratory tract for that to occur."
http://abcnews.go.com/Health/wireStory?id=1755512
http://news.yahoo.com/s/ap/20060322/ap_on_he_me/bird_flu_virus
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