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Background  Immunoglobulin A is the most abundant isotype in secretions from mucosal surfaces of the gastrointestinal, respiratory and genitourinary tracts and in external secretions such as colostrum, breast milk, tears and saliva. The high concentration of human secretory IgA (hsIgA) in human colostrum strongly suggests that it should play an important role in the passive immune protection against gastrointestinal and respiratory infections.    Materials and methods  Human secretory IgA was purified from colostrum. The reactivity of hsIgA against mycobacterial antigens and its protective capacity against mycobacterial infection was evaluated.    Results  The passive administration of hsIgA reduces the pneumonic area before challenge with  M.  tuberculosis. The intratracheal administration of  M. tuberculosis  preincubated with hsIgA to mice greatly reduced the bacterial load in the lungs and diminished lung tissue injury.    Conclusions  HsIgA purified from colostrum protects against  M. tuberculosis  infection in an experimental mouse model.

bmc immunology

Passive administration of purified secretory IgA from human colostrum induces protection against Mycobacterium tuberculosis in a murine model of progressive pulmonary infection