1. 1) Holmgren J and Czerkinsky C : Mucosal immunity and vaccines. Nat Med 11 Suppl 4: S45–S53, 2005.
2. 2) Tamura S and Kurata T : Defense mechanisms against influenza virus infection in the respiratory tract mucosa. Jpn J Infect Dis 57: 236–247, 2004.
3. 3) Tamura S, Tanimoto T and Kurata T : Mechanisms of broad cross-protection provided by influenza virus infection and their application to vaccines. Jpn J Infect Dis 58: 195–207, 2005.
4. 4) Alford RH : Antibody in nasal secretions after intramuscular injection of influenza virus vaccine in persons with chronic bronchopulmonary disease. J Immunol 103: 20–24, 1969.
5. 5) Shvartsman YS and Zykov MP : Secretory anti-influenza immunity. Adv Immunol 22: 291–330, 1976.