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Internalization of pure MNV or MNV in biosolids, DM, or SM by lettuce. Intact lettuce pieces or lettuce pieces with a long cut on the edge and short cuts on the stem were submerged in a manure suspension for 5 min. Each lettuce piece was then wiped with 1% Virkon to eliminate the attached viruses but not the internalized viruses. Gray bars, pure virus; open bars, MNV in biosolids; bars with diagonal lines, MNV in DM; black bars, MNV in SM.
