The age group infected with seasonal influenza A and influenza B were mostly 1 - 5 years old, while the one infected most with A / H1N1pdm09 was 6 - 18 years old.
Nhóm tuổi nhiễm virus cúm mùa A và cúm B chủ yếu là 1-5 tuổi, cúm A / H 1 N1pdm09 là 6-18 tuổi.