(A) Copy number of Plasmodium yoelii 18s RNA gene per 1×106 mouse G3PDH gene measured at 42 h post sporozoite inoculation. Female BALB/c, B6, and CBA/J mice (N = 5) infected with 50 Schistosoma mansoni-cercaria 10 weeks previously were challenged with 1,500 SPZ of P. yoelii along with S. mansoni-non-infected controls. BALB/c: ***P<0.001, t = 6.283, df = 8; B6: *P<0.05, t = 2.511, df = 8; CBA: **P<0.01, t = 4.220, df = 7. (B) Copy number of Plasmodium berghei 18s RNA gene per 1×106 mouse G3PDH gene measured at 42 h post sporozoite inoculation. Female BALB/c, B6, and CBA/J mice (N = 5) infected with 50 S. mansoni-cercaria 10 weeks previously were challenged with 1,500 SPZ of P. berghei along with S. mansoni-non-infected controls. BALB/c: *P<0.05, t = 2.306, df = 8; B6: ***P<0.001, t = 5.336, df = 8; CBA: *P<0.05, t = 2.846, df = 7. All data were statistically examined using Student’s two-tailed t-test.