Diseases and parasites also transfer from farmed to wild salmon populations. A recent study in British Columbia links the spread of parasitic sea lice from river salmon farms to wild pink salmon in the same river."[47] The European Commission (2002) concluded “The reduction of wild salmonid abundance is also linked to other factors but there is more and more scientific evidence establishing a direct link between the number of lice-infested wild fish and the presence of cages in the same estuary.”[48] It is reported that wild salmon on the west coast of Canada are being driven to extinction by sea lice from nearby salmon farms.[49] Antibiotics and pesticides are often used to control the diseases and parasites.