<p>Secretion of anti-HA IgA antibodies against VN/1203, ID/05, and AH/01 H5N1 inactivated antigen in nasal and lung lavage (dilution 1∶5) from mice immunized i.n. with single H5N1 influenza split vaccines (3 µg HA per dose) and a trivalent vaccine containing 1 µg HA per dose of each single vaccine in combination with adjuvant. The values are means ± SEM from six mice. * p<0.05 and ** p<0.01. The dashed horizontal line indicates the lower limit of detection.</p
