THE SURVIVAL OF OSTERTAGIA-CIRCUMCINCTA AND TRICHOSTRONGYLUS-COLUBRIFORMIS IN FECAL CULTURE AS A SOURCE OF BIAS IN APPORTIONING EGG COUNTS TO WORM SPECIES

被引:68
作者
DOBSON, RJ
BARNES, EH
BIRCLIJIN, SD
GILL, JH
机构
[1] CSIRO Division of Animal Health, Glebe, NSW 2037
关键词
EGG COUNT; FECAL CULTURE; OSTERTAGIA-CIRCUMCINCTA; TRICHOSTRONGYLUS-COLUBRIFORMIS; VIABILITY; LARVAL DIFFERENTIATION;
D O I
10.1016/0020-7519(92)90060-X
中图分类号
R38 [医学寄生虫学]; Q [生物科学];
学科分类号
07 ; 0710 ; 09 ; 100103 ;
摘要
When cultured alone or concurrently with Trichostrongylus colubriformis in sheep faeces, Ostertagia circumcincta produced fewer infective larvae per 100 eggs than did T. colubriformis. Averaged over five trials 60% of T. colubriformis eggs were recovered as infective larvae while for O. circumcincta the figure was only 39%. This result was observed for two strains of O. circumcincta and was independent of when larvae were harvested from culture (days 6-10 at 25-degrees-C). The mortalities of both species occurred at the first and second larval stages. These observations are of concern when using larval differentiation from faecal culture to make quantitative estimates of worm egg numbers for each species present. Species such as T. colubriformis which have a low mortality during culture are likely to have their egg numbers overestimated when cultured with a species, like O. circumcincta, that suffers high mortality in culture.
引用
收藏
页码:1005 / 1008
页数:4
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