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CDC genetically characterized 2,224 influenza viruses collected in the U.S. from September 29, 2019, to March 14, 2020.
Virus Subtype or Lineage Genetic Characterization
Total No. of Subtype/Lineage Tested Clade Number (% of subtype/lineage tested) Subclade Number (% of subtype/lineage tested)
A/H1 786
6B.1A 786 (100%)
A/H3 483
3C.2a 454 (94.0%) 2a1 454 (94.0%)
2a2 0
2a3 0
2a4 0
3C.3a 29 (6.0%) 3a 29 (6.0%)
B/Victoria 869
V1A 869 (100%) V1A 0
V1A.1 57 (6.6%)
V1A.3 812 (93.4%)
B/Yamagata 86
Y3 86 (100%)
今年流感毒株抽样统计结果