Punctuated Evolution of Influenza Virus Neuraminidase (A/H1N1) under Opposing Migration and Vaccination Pressures

Figure 1

Chronological plot of ⟨𝜓⟩ for NA and HA (MZ scale, [12]). The HA pattern is dominated by two large peaks associated with the Fort Dix outbreak and swine flu. This pattern will be discussed in detail in a later paper.