NEW GENETIC AND PRACTICAL IMPLICATIONS OF SELECTION FOR ANTHELMINTIC RESISTANCE IN PARASITIC NEMATODES

Investigations into genetic mechanisms underlying anthelmintic resista nce in parasitic nematodes have indicated that even at moderate levels of resistance, reversion to the initial level of susceptibility may b e impossible Alleles that confer the higher levels of susceptibility m ay be lost from the population in the early stages of selection. There fore close monitoring of early steps in the selection for resistance i s needed, as discussed here by Marleen Roos, Marcel Kwa and Warwick Gr ant