Figure 1.

Hemagglutination inhibition (HI) and microneutralization (MN) antibody (Ab) titers after H7N7 inactivated influenza vaccination in H7N7 live attenuated influenza vaccine (LAIV)–primed subjects. Serum HI and MN titers against H7N7 NL/03 were determined at intervals after the inactivated vaccine. Each line connects data points for an individual subject (n = 7). Data points for subjects who received 2 LAIV doses are shown as filled circles; open circles identify data points for the 2 subjects who received only 1 H7N7 LAIV dose. Two subjects did not provide serum on day 28. Abbreviation: IIV, inactivated influenza vaccine.