“…Due to the social and economic importance of the diseases caused by those organisms, interest has been focused on insect haemolymph or gut extract haemagglutinins involved in carbohydrate-binding specificities, because it is considered that they could exert an influence on host-parasite interactions in the appropriate vectors (Molyneux & Killick-Kendrick, 1987;Maudlin, 1991). Haemagglutinins occur in the haemolymph and gut of haematophagous insects such as tsetse flies -Glossina (Ibrahim et al, 1984;Ingram & Molyneux, 1988, 1990, sandflies -Phlebotomus (Wallbanks et al, 1986) and Triatomine bugs (Hemiptera: Reduviidae) (Pereira et al, 1981;Barracco & Loch, 1988;Gomes et al, 1988). In addition, anti-parasite agglutinins have been detected in midgut extracts (Ibrahim et al, 1984;Wallbanks et aI., 1986).…”