Figure 2 Genome organization of MBV. The genomic RNA (4009 nucleotides) is shown as a bold solid line with the four major opening reading frames (ORFs) 1-4 and the three minor ORFs 5-7 denoted by open rectangles. Numbers below or above the ORFs indicate the size of the polypeptide they may encode. ORF 4 encodes the major capsid protein of 22 kDa and ORF 3 encodes a putative RNA-dependent RNA polymerase (47 kDa).

campestris. The distribution of MBV coincides with that of the commercial cultivation of A. bisporus; the virus has been reported in most major mushroom-growing countries.

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