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Effect of IgA on survival of vaccinated mice upon challenge. Survival of IgA−/− versus congenic IgA+/+ mice following challenge. Vaccinated IgA−/− mice (open triangles, n = 23), vaccinated IgA+/+ mice (solid triangles; n = 16), mock-vaccinated IgA−/− mice (open squares; n = 17), and mock-vaccinated IgA+/+ mice (solid squares; n = 14).
