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Biotech / Medical : Aviron -- Ignore unavailable to you. Want to Upgrade?


To: LLCF who wrote (533)1/18/2000 11:21:00 AM
From: Haolin Ni  Read Replies (1) | Respond to of 645
 
I mean it is difficult to develop the live attenuated vaccine when the viral antigen, like flu virus, is changing.
Generally, a live attenuated vaccine is better than dead one.