Comparative Efficacy of Ivermectin and Levamisole for Reduction of Migrating and Encapsulated Larvae of Baylisascaris transfuga in Mice
2011
Fu, Yan, Sichuan Agricultural University, Ya'an, China | Nie, Hua-Ming, Sichuan Agricultural University, Ya'an, China | Niu, Li-Li, Chengdu Zoological Garden, Chengdu, China | Xie, Yue, Sichuan Agricultural University, Ya'an, China | Deng, Jia-Bo, Chengdu Zoological Garden, Chengdu, China | Wang, Qiang, Chengdu Zoological Garden, Chengdu, China | Yang, Guang-You, Sichuan Agricultural University, Ya'an, China | Gu, Xiao-Bin, Sichuan Agricultural University, Ya'an, China | Wang, Shu-Xian, Sichuan Agricultural University, Ya'an, China
The comparative efficacy of 2 anthelmintics (ivermectin and levamisole) against Baylisascaris transfuga migrating and encapsulated larvae was studied in mice. A total of 60 BALB/c mice inoculated each with about 1,000 embryonated B. transfuga eggs were equally divided into 6 groups (A-F) randomly. Mice of groups A and B were treated with ivermectin and levamisole, respectively, on day 3 post-infection (PI). Mice of groups A-C were killed on day 13 PI. Similarly, groups D and E were treated with ivermectin and levamisole, respectively, on day 14 PI, and all mice of groups D-F were treated on day 24 PI. The groups C and F were controls. Microexamination was conducted to count the larvae recovering from each mouse. The percentages of reduction in the number of migrating larvae recovered from group A (ivermectin) and B (levamisole) were 88.3% and 81.1%, respectively. In addition, the reduction in encapsulated larvae counts achieved by ivermectin (group D) and levamisole (group E) was 75.0% and 49.2%, respectively. The results suggested that, to a certain extent, both anthelmintics appeared to be more effective against migrating larvae than encapsulated larvae. However, in the incipient stage of infection, ivermectin may be more competent than levamisole as a larvicidal drug for B. transfuga.
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