Parasite burdens in wild-type (WT), major histocompatibility complex (MHC) I−/− and MHC II−/− mice after subcutaneous (s.c.) infection with 3000 Strongyloides venezuelensis L3 larvae. The number of eggs per gram of faeces eliminated in faeces (a), adult worms recovered from the small intestine (b), and the fecundity rate (c) were evaluated at 0, 5, 8, 13 and 21 days post-infection. Data are expressed as mean ± standard error of the mean (SEM) (n = 6). Results are representative of two or three independent experiments. *WT versus MHC I−/−; #WT versus MHC II−/−; &MHC I−/− versus MHC II−/−; P < 0·05.