We wished to analyzes the epidemic characteristics,virus isolation and small hydrophobic gene sequences of the mumps virus in Beijing,China,during 2004~2016,and compare its homology with the mumps virus in other provinces in China and the sequence of the global reference strain,In this way,we could elaborate the distribution and variation of the genotype of the Beijing mumps,explain the how the G genotype virus was imported and from where originated.Since 2007,with an increase in the number of immunized pat...