UPDATE: Possible source of salmonella found linked to US egg recall

A potential source of the salmonella that tainted shell eggs from two companies and started a nationwide egg recall has been identified, according to CNN.
The bacteria has been found in chicken feed and in barns and walkways at Wright County Egg and Hillandale Farms, the two companies in the middle of the recall. According to federal investigators, contamination likely happened at some point after the feed or feed ingredients went through the heat treatment that kills salmonella. The feed was produced at a Wright County Egg mill and given to pullet chickens at both companies. The exact cause of contamination has not yet been determined, and federal officials are not ruling out the possibility of other sources.
Wright County Egg and Hillandale Farms have now recalled over half a billion shell eggs between them; a Food and Drug Administration (FDA) spokesperson said the two recalls are related. According to a Hillandale Farms spokesman the farms share a number of common suppliers. The Centers for Disease Control and Prevention (CDC) reported that 2,403 cases of Salmonella enteritidis were recorded from May 1 to August 25, as opposed to the 933 cases that would normally be reported during that timeframe.
The original Wright County Egg recall specifically relates to eggs packed between May 16 and Aug. 13, with Julian dates ranging from 136 to 229 and plant numbers 1026, 1413, 1720, 1942 and 1946. In addition to Cardenas and Trafficanda, brand names include: Lucerne, Sunshine, Hillandale, Trafficanda, Farm Fresh, Shoreland, Dutch Farms, James Farms, Glenview, Mountain Dairy, Ralphs, Boomsma, Lund, Kemps and Pacific Coast. Affected eggs were distributed to food wholesalers, distribution centers and foodservice companies in California, Arizona, Missouri, Minnesota, Texas, Georgia, Washington, Oregon, Colorado, Nevada, Iowa, Illinois, Utah, Nebraska, Arkansas, Wisconsin and Oklahoma.
There are also two new brands to add to the growing recall list. Wright County Egg said it has confirmed evidence of salmonella in two previously unrecalled brands of shell eggs: Cardenas Market and Trafficanda Egg Ranch. Cardenas eggs were distributed to Cardenas Market stores in California and Nevada, packaged in 60-egg cases wrapped in plastic, and bear the plant number 1026 and Julian dates ranging from 136 to 228. Trafficanda eggs were distributed to grocery stores and food service companies in California in 12-egg cartons, 20-egg wrapped packages and 60-egg wrapped packages. Plant numbers 1026, 1413, 1720, 1942 and 1946 are included in the recall, with eggs bearing Julian dates from 136 to 229.
The Hillandale Farms recall covers eggs distributed under the brand names Hillandale Farms, Sunny Farms and Sunny Meadow sold between April and August. Hillandale said the eggs were distributed to grocery distribution centers, retail groceries and food service companies that serve or are located in 14 states: Kansas, Arkansas, California, Iowa, Illinois, Indiana, Minnesota, Missouri, Nebraska, North Dakota, Ohio, South Dakota, Texas and Wisconsin.
A complete list of affected eggs is available through the Egg Safety Center.