Sallé G, et al. - Researchers here analyzed data gathered from 1,673 necropsy reports collected over 29 years, in the reference necropsy centre from Normandy (France), in order to determine the temporal trend in non-strongylid epidemiology and the contribution of parasites to the deaths of horses. As per the analysis, there were seasonal variations in non-strongylid parasite abundance and race horses had reduced worm burden. In addition to these observations, a shift in the species responsible for fatal parasitic infection was noted from the year 2000 onward, whereby fatal cyathostominosis and Parascaris spp. infection have replaced cases of death caused by Strongylus vulgaris and tapeworms. Also, they observed a concomitant break in the temporal trend of parasite species prevalence within a 10-year window (1998-2007) that has witnessed the increase of Parascaris spp. and the lessening of both Gasterophilus spp. and tapeworms. Available deworming history data was agreeable with lower drug efficacy after 2000.