Fig. 2

Typical effect of albendazole treatment on Haemonchus spp. species distribution and codon 198 polymorphisms. Pools of larvae from the same animals (5 animals less than one year old from Tulus) on day 0 (upper panels) and day 14 (lower panels) after treatment with albendazole (ABZ) were analysed for polymorphisms in the isotype 1 β-tubulin gene. The beginning of an intron (a) was used to determine the Haemonchus species composition. Bases specific for H. placei are printed in bold; bases specific for H. contortus are underlined. Another region further downstream in the chromatogram shows the sequences for codons 198 and 200 (b). Peaks specific for H. placei and for the susceptible genotype in codon 198 occurred only on day 0 but not on day 14