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[This message has been edited by LDoyle (edited December 13, 2002).]
Mold requires moisture and darkness to grow.
Housewrap does not contribute in any way to increasing moisture or darkness in a home.
As already mentioned, housewrap is an air barrier but it allows the free flow of water vapor to pass thru.
Behind all sidings you need a secondary weather barrier. The purpose of a secondary weather barrier is to prevent wind and sun borne moisture from pentetrating the siding and damaging the sheathing.
Housewrap is but one such secondary weather barrier and in fact #15 or 30 lb roof felt performs better in most circumstances. Foam boards can also be used as secondary weather barriers.
Here is a helpful link: