Abstract
SUMMARY The present study was conducted on ten llamas (Lama glama) naturally infected with gastrointestinal parasites: namely Nematodirus spp.. Capillaria spp. Strongyloides spp. and Trichostrongyles. Six weeks after treatment with t o doses of albendazole. eight animals recovered from infection. while two retained very mild (<100 eggs per gram of feces) infection with Nematodirus species. The susceptibility of these llamas to the natural reinfection with gastrointestinal parasites was monitored for a period of nine months. There was a gradual increase in the number of infected animals. reaching it's peak in April. where eight lamas were infected with gastrointestinal parasites. In May. only four animals were shedding low number of eggs of parasites. Fluctuation in passing eggs of parasites continued, and another peak of infection was observed ni July. In this month, eight animals were shedding eggs of parasites. In August. three animals died and of the remained llamas, six were infected with gastrointestinal parasites. Natural reinfection with gastrointestinal parasites was of olw intensity (<100-100 eggs per gram of feces) throughout the study. Female llamas appeared more susceptible to infection with gastrointestinal parasites than males. and they showed less tendency for fluctuation ni passing eggs ni their feces.