IgA immunodeficiency leads to inadequate Th cell priming and increased susceptibility to influenza virus infection.
Arulanandam BP, Raeder RH, Nedrud JG, Bucher DJ, Le J, Metzger DW. IgA immunodeficiency leads to inadequate Th cell priming and increased susceptibility to influenza virus infection. J Immunol. 2001 Jan 01; 166(1):226-31.