Following the experimental infection with H. contortus the levels of IgA anti-L3 and anti-ESP responses increased in all the infected animals from 7 d.p.i. to peak between 21 and 28 d.p.i., and then decreased rapidly to reach a baseline at 42 d.p.i. to the end of the infection (P < 0.05, Fig. 5). The gene discussed is CD79A; the disease is infection.