Figure 3From: Potency of a vaccine prepared from A/swine/Hokkaido/2/1981 (H1N1) against A/Narita/1/2009 (H1N1) pandemic influenza virus strainChanges in body weight of mice injected subcutaneously twice with Sw/Hok/81 vaccine after the challenge with Narita/09. Data are shown as mean body weight ± standard error. ES: ether split, WV: whole inactivated. †: Mice died.Back to article page