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People need to understand that there are two forms of vaccines that are being investigated right now. Preventative and therapeutic vaccines. For a successful preventive vaccine to be developed all the 9 subtypes of the virus must be incorporated and some how prevent the virus from mutating once it get inside the body. So far we have not been able to redress both of this issues consistantly.
Currently there are a few vaccines candidate that are in phase III clinical trials. One of those key trials that was schedule to ran parallel to the Thailand study here in the US was halted!
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