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The consumption of lettuce (Lactuca sativa) can be an important means of transmission of severalparasitic diseases, so the increasing inclusion of vegetables in the diet of the world populationpresents an important challenge. The objective of this study was to evaluate the contamination oflettuce (L. sativa) marketed in the municipality of Itaqui (RS) by parasites of interest to public health.A sampling process was used, selecting supermarkets and local producers in the city of Itaqui. Weinvestigated 60 samples of lettuce (L. sativa) of the curly variety, from 30 local producers and 30local markets, all acquired at random. The lettuce samples were placed in clean plastic bags andidentified. The leaves were separated and washed in a glass container with 250 ml of sterile distilledwater. The wash water was analyzed using three parasitological techniques: direct examination,spontaneous sedimentation technique (Lutz) and flotation of zinc sulfate to 33% (Faust). Themorphological features of the parasite were examined by means of an optical microscope. Of the60 samples analyzed, 29 (48.33%) had some type of parasites. Of these, 19 (63.34%) were fromlocal producers and 10 (36.66%) from local markets. Eggs were found of Ascaris sp. (5%) andcysts of Giardia lamblia (38%) and Entamoeba sp. (13%). Checking for the presence of parasites,particularly helminths and protozoa, especially in vegetables, has great interest for public health,because it supplements health surveillance on the hygienic condition of the goods.

AVALIAÇÃO PARASITOLÓGICA DE ALFACES (Lactuca sativa) COMERCIALIZADAS EM UM MUNICÍPIO DA FRONTEIRA OESTE, RIO GRANDE DO SUL, BRASIL