Fig. (1) Prevalence (%) (with std errors) for the helminth species of R. norvegicus and M. musculus from shantytowns and parklands of the City of Buenos Aires. Acantocephalans: Mm – Moniliformis moniliformis (Bremser, 1811); Cestodes; Ht – Hydatigera taeniaeformis (Batsch, 1786); Hd – Hymenolepis diminuta (Rudolphi, 1819); Hn – Hymenolepis nana (Siebold, 1852); Nematodes; Gn – Gongylonema neoplasticum (Fibiger et Ditlevsen, 1914); Nb – Nippostrongylus brasiliensis (Travassos, 1914); Csp – Capillaria sp.; Hs – Heterakis spumosa Schneider, 1866.