From: Using a community based survey of healthcare seeking behavior to estimate the actual magnitude of influenza among adults in Beijing during 2013-2014 season
Characteristics
Epidemic period
Non-epidemic period
Subtypes
A(H1N1) pdm 09
25,098
118
A(H3N2)
13,060
1,781
B
13,714
1,002
Age groups
18–59
44,409
423
≥ 60
7,592
2,478
Total
52,001
2,901