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HRSV subgroup epidemiology. Distribution of HRSV subgroups circulating in Kawasaki, Japan, during 1985–2005. The number in parentheses indicates HRSV infections among patients aged less than 3 years. A, HRSV-A; B, HRSV-B; A/B, dual infection with HRSV-A and HRSV-B.
