Just to close out this thread there are at least two separate papers indicating that this is, in fact, not true. Rib does not add to early response when combined with ifn-a - it kicks in later in preventing breakthrough and preventing relapse.
See ivillage site for details.
Note that this is interesting given that the logic you extoll above is reasonable - perhaps it is because rvr has a smaller false negative than false positive? (I do not actually know this is true - but suspect it)
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