"This water sample is from what's called spent egg wash water -- that is, water that is used to wash the exterior of the eggs as the eggs are coming down a conveyor line from the laying house into the packing facility," he explained.
Last week, investigators said they'd found positive samples of salmonella bacteria in feed given to chickens at the two farms implicated in the ongoing egg recall, suggesting that feed or feed ingredients might be the source of the salmonella outbreak.
Still, Farrar stressed last week and at today's news conference, "it's important not to draw conclusions about the source of contamination on these farms."
Wright County Egg and Hillandale Farms issued the egg recall earlier this month after receiving reports that salmonella had sickened nearly 2,000 people.
Meanwhile, two new brands of eggs were added Thursday to the recall tied to the two Iowa farms.
Wright County Egg said it had found salmonella in the Cardenas Market brand and was beginning a voluntary recall. Affected cartons have the plant number 1026 on the side and Julian (packaged) dates between 136 and 228, CBS News reported Thursday.
And Trafficanda Egg Ranch reported salmonella in some of its eggs from Wright County. Affected plant numbers are 1026, 1413, 1720, 1942 and 1946, with Julian dates between 136 and 229, the news network said.
At least 550 million eggs have been recalled so far, according to federal officials. Experts stress that any shell eggs that have been recalled from store shelves are being destroyed.
To find out if any eggs in your fridge might be affected, check the carton for the "Sell By" date and the two numbers below it, federal health officials said, to see if
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