A biosensor is provided that comprises a substrate, a sample site
positioned on the substrate, a cover coupled to the substrate, and
biocide positioned between the substrate and the cover. The biosensor may
also include desiccant. The cover is operative to selectively block
access to the sample site. The cover includes a fixed end coupled to the
substrate, an opposite free end, and a middle portion extending across
the sample site. The middle portion is releasably and recloseably adhered
to the substrate.