The overall prevalence rate of the intestinal parasites in Laos ranges from 76.8% to 95.7% depending on living conditions. The predominant species is Opisthorchis complex with the peak in age group greater than 20 years and infected in one village all men over 20 years. Unusually high frequency demonstrated Sarcocystis hominis as well as Taenia sp. with the culmination of infection among the adults. The habit of eating raw flesh of fish, beef and pork is responsible for the spreading of these three zoonotic parasitoses. The intimate coexistence between the domestic animals and man explains the prevalence of Trichostrongylus sp. Low infection rate as E. histolytica have been found as well of low level of antiamoebic antibodies. The multiple infections raise with the age and the predominant participation of helminths was demonstrated.