As investigators probe an unusual number of listeriosis cases in Ontario this year alongside a new tainted-meat recall, food inspectors have raised fresh questions about gaps between Canadian and U.S. food safety regimes.

Plants that package meat for Canada's domestic market are inspected just once a week, while those that ship to the U.S. must be checked daily. The union that represents inspectors now says that in recent months, the Canadian Food Inspection Agency has resorted to paying for more overtime inspections after American officials said scrutiny on this side of the border fell short of U.S. standards.

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