Studies on Infectivity of Trichinella isolates

Biological characteristics of Trichinella from swine and dog in Hei Longjiang Province, China were first investigated in combination with studies in infectivity in rats, mice and pigs, the international standard Trichinella isolates, T. spiralis and T. nativa were used as the control. The experimental results indicated as follows:The rat seemed to be refractory to swine and dog isolates, T. spiralis and T. nativa, but swine isolate and T.spiralis were of higher infectivity to rat than dog isolate and T.nativa (P0.01), Reproductive Capacity Indexes (RCI) of Trichinella from swine and dog, T.spiralis and T. nativa were 35.02, 2.90, 32.10 and 2.66 , respectively. Infectivity of Trichinella from swine and dog, T.spiralis and T.nativa in mice and pigs was significantly different. Swine isolate and T. spiralis were highly infective to mice and pigs with RCIs of 1137.41 and 159.86 as well as 385.68 and 300.55 respectively, however, mice and pigs were relatively refractory to dog isolate and T. nativa with RCIs of 64.98 and 58.15 as well as 0.064 and 0.033 respectively.On the basis of the results of genetics and biology, it is concluded that Trichinella from swine and dog in Hei Longjiang province,China belong to Trichinella spiralis and Trichinella nativa,respectively.