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McDonald's suspended sales of the Quarter Pounder burger in October in about a fifth of its US restaurants in response to the outbreak.

McDonald's said in a statement that it "identified an alternate supplier" for about 900 restaurants that had "temporarily stopped serving Quarter Pounder burgers with slivered onions".

E.coli linked to slivered onions on some McDonald's Quarter Pounder burgers in America has caused 104 people to become ill, according to US health officials.

In a statement, McDonald's said it had now found an alternative supplier and has started selling Quarter Pounders with onions again at the affected restaurants.

"Over the past week, these restaurants resumed the sale of Quarter Pounder burgers with slivered onions," it said.