Figure 3: Neutralization activities in human sera against viruses.
From: In vitro and in vivo characterization of new swine-origin H1N1 influenza viruses
Human sera of donor groups 1 (collected in 1999) and 2 (collected in April and May of 2009) were subjected to neutralization assays with CA04 and KUTK-4. Because the sera of donor group 1 were collected in 1999, little neutralization activity was expected against KUTK-4, which was isolated in 2009.
