Growth of the Vegetatively Propagated Strain of Larval Echinococcus Multilocularis in Some Strains of Jackson Mice and in Their Hybrids

The growth of larval E. multilocularis in seven strains of Jackson mice was examined. It was fastest in C57L, the average cyst weight after 120 days of growth exceeding 7 g. The cysts grew slower in the DBA/1 and RF mice, but tended to become invasive.In the LAF1 hybrids the growth was almost as fast as in the C57L, and much faster than in A/He strain. In the B6D2F1 hybrids, however, the growth was much slower than in both parental strains. The cysts grew slowly in obese, dwarf, and hairless mutants.