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Influenza viruses types,

Influenza Viruses

Types

Cause Flu Season

  • Influenza A (Influenza virus types responsible for most human illness and the flu season)
  • Influenza B

Influenza C (Not significant for public health)

Influenza D (Mainly infect cows)

Subtypes

  • A(H1N1)
  • A(H3N2)

Lineages

  • B(Victoria)
  • B(Yamagata)

Clades (Groups)

[Select Examples]

  • 6B.1
  • 3C.2a, 3C3a
  • V1A
  • Y1, Y2, Y3

Sub-Clades (Sub-Groups)

[Select Examples]

  • 6B.1
  • 3C.2a1; 3C.2a2: 3c.2a3: 3C.2a4
  • V1A.1; V1A.2; V1A.3
  • None