Schistosoma japonicum: interactions of successive infections in pigs and mice using polymerase chain reaction-based identification of individual worms.

The study reported here investigated acquired resistance of mice and pigs to challenge-infections with Schistosoma japonicum. Two morphologically indistinguishable isolates of the parasite (from the Anhui and Zhejiang provinces of China), which could be typed by polymerase chain reaction-linked restriction fragment length polymorphism analysis (PCR-RFLP), were used for the infections. In two parallel infection studies, 60 female outbred NMRI mice and 29 Danish Landrace/Yorkshire/Duroc crossbred pigs were used. Two of the groups received a primary infection with either the Anhui or the Zhejiang isolate, respectively. The remaining groups received a primary infection with the Zhejiang isolate and challenge-infections with the Anhui isolate at either week 2, 3, 4 or 6 post primary infection. The results of the study indicated that both mice and pigs are partially resistant to challenge-infection from week 4 post primary infection. Resistance appeared to decrease in pigs 6 weeks after primary infection, while it remained effective in mice. These results suggest that the mechanism responsible for acquired resistance in mice and pigs may not be the same and support the theory that worm burdens in pigs receiving repeated infection are in a balance between acquisition and loss of worms.