Global occurrence of Cryptosporidium and Giardia in shellfish: Should Canada take a closer look?

摘要: Abstract The zoonotic protozoan parasites Cryptosporidium parvum, and Giardia duodenalis can colonize the gastrointestinal tracts of many farmed, domestic wild animals, are capable causing disease in humans. Due to their high prevalence dairy beef cattle, farms considered be potential sources transmission surrounding bodies water. Additionally, human sewage overflow events also contaminate nearby water sources. Both protozoa have been detected various species shellfish, but a lack consistency methods for detection viability assessments make it difficult compare data extrapolate results. Nonetheless, these shellfish destined consumption is necessary due public health risk that pose. There currently no legislation requiring officials test potentially contaminated or water, despite increasing evidence suggesting need implement parasitological analyses. Furthermore, standard depuration procedures ineffective at inactivating parasites, even supplementation with ultraviolet radiation requires extensive periods effectively inactivate all (oo)cysts from bivalves. Although there official reports gastroenteritis acquired consuming sp. and/or G. duodenalis, studies examining efficacy current monitoring standards Canada needed event they inadequate removal harmful parasites.