title: Detection of infectious Cryptosporidium parvum oocysts in mussels (Mytilus galloprovincialis) and cockles (Cerastoderma edule).
abstract: Infective Cryptosporidium parvum oocysts were detected in mussels (Mytilus galloprovincialis) and cockles (Cerastoderma edule) from a shellfish-producing region (Gallaecia, northwest Spain, bounded by the Atlantic Ocean) that accounts for the majority of European shellfish production. Shellfish were collected from bay sites with different degrees of organic pollution. Shellfish harboring C. parvum oocysts were recovered only from areas located near the mouths of rivers with a high density of grazing ruminants on their banks. An approximation of the parasite load of shellfish collected in positive sites indicated that each shellfish transported more than 10(3) oocysts. Recovered oocysts were infectious for neonatal mice, and PCR-restriction fragment length polymorphism analysis demonstrated a profile similar to that described for genotype C or 2 of the parasite. These results demonstrate that mussels and cockles could act as a reservoir of C. parvum infection for humans. Moreover, estuarine shellfish could be used as an indicator of river water contamination.
authors.affiliation: Parasitología y Enfermedades Parasitarias, Departamento de Patología Animal (Sanidad Animal), Facultad de Veterinaria, Universidad Complutense, 28040 Madrid, Spain. mergoba@eucmax.sim.ucm.es
authors.forename: M
authors.initials: M
authors.lastname: Gomez-Bautista
authors.forename: L M
authors.initials: LM
authors.lastname: Ortega-Mora
authors.forename: E
authors.initials: E
authors.lastname: Tabares
authors.forename: V
authors.initials: V
authors.lastname: Lopez-Rodas
authors.forename: E
authors.initials: E
authors.lastname: Costas
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D001267:Atlantic Ocean; D049872:Bivalvia / Q000469:parasitology*; D003457:Cryptosporidiosis / Q000635:transmission; D016785:Cryptosporidium parvum / Q000302:isolation & purification*; D004197:Disease Reservoirs; D005618:Fresh Water / Q000469:parasitology; D006801:Humans; D051379:Mice; D008974:Mollusca / Q000469:parasitology*; D016133:Polymerase Chain Reaction; D012150:Polymorphism, Restriction Fragment Length; D012418:Ruminants / Q000469:parasitology; D012623:Seawater / Q000469:parasitology; D012758:Shellfish / Q000469:parasitology*; D013030:Spain