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Monthly distribution and subgenogroups of hMPV strains isolated in Yamagata, Japan, in 2004 and 2005. (a) Subgenogroups A2, B1, and B2 were grouped according to the phylogenetic analysis whose results are shown in Fig. 3. Monthly distributions are also shown for one primary school (b) and two nurseries (c and d) at which we isolated more than five hMPV strains.
