Customers enter a Chipotle restaurant in Seattle, Washington November 20, 2015. The U.S. Centers for Disease Control and Prevention (CDC) said on Friday that three additional states reported E. coli infections from the same strain as the Chipotle Mexican Grill outbreak, sending shares in the chain down more than 12 percent. REUTERS/David Ryder 

A sign on the door of a Chipotle restaurant is shown in Seattle, Washington November 20, 2015. The U.S. Centers for Disease Control and Prevention (CDC) said on Friday that three additional states reported E. coli infections from the same strain as the Chipotle Mexican Grill outbreak, sending shares in the chain down more than 12 percent. REUTERS/David Ryder 

A sign on the door of a Chipotle restaurant is shown in Seattle, Washington November 20, 2015. The U.S. Centers for Disease Control and Prevention (CDC) said on Friday that three additional states reported E. coli infections from the same strain as the Chipotle Mexican Grill outbreak, sending shares in the chain down more than 12 percent. REUTERS/David Ryder 

A Chipotle restaurant is shown in Federal Way, Washington November 20, 2015. The U.S. Centers for Disease Control and Prevention (CDC) said on Friday that three additional states reported E. coli infections from the same strain as the Chipotle Mexican Grill outbreak, sending shares in the chain down more than 12 percent. REUTERS/David Ryder 

The sign of a Chipotle restaurant is shown in Federal Way, Washington November 20, 2015. The U.S. Centers for Disease Control and Prevention (CDC) said on Friday that three additional states reported E. coli infections from the same strain as the Chipotle Mexican Grill outbreak, sending shares in the chain down more than 12 percent. REUTERS/David Ryder 

The sign of a Chipotle restaurant is shown in Federal Way, Washington November 20, 2015. The U.S. Centers for Disease Control and Prevention (CDC) said on Friday that three additional states reported E. coli infections from the same strain as the Chipotle Mexican Grill outbreak, sending shares in the chain down more than 12 percent. REUTERS/David Ryder 

A Chipotle restaurant is shown in Federal Way, Washington November 20, 2015. The U.S. Centers for Disease Control and Prevention (CDC) said on Friday that three additional states reported E. coli infections from the same strain as the Chipotle Mexican Grill outbreak, sending shares in the chain down more than 12 percent. REUTERS/David Ryder 

A Chipotle restaurant is shown in Federal Way, Washington November 20, 2015. The U.S. Centers for Disease Control and Prevention (CDC) said on Friday that three additional states reported E. coli infections from the same strain as the Chipotle Mexican Grill outbreak, sending shares in the chain down more than 12 percent. REUTERS/David Ryder 

A Chipotle restaurant is shown in Federal Way, Washington November 20, 2015. The U.S. Centers for Disease Control and Prevention (CDC) said on Friday that three additional states reported E. coli infections from the same strain as the Chipotle Mexican Grill outbreak, sending shares in the chain down more than 12 percent. REUTERS/David Ryder 

XL Foods workers listen to Doug O'Halloran, president of the United Food and Commercial Workers Local 401, during a news conference stating that XL Foods are still refusing to address food safety issues flagged by the union in Brooks, Alberta, October 10, 2012. Ten people have now fallen sick from contaminated beef products from the XL Foods plant, health officials said on Saturday. Four previous cases were also in Alberta, and officials say they have evidence that these victims ate meat produced by the XL Foods plant in Brooks, Alberta. The Canadian officials said the six new cases were caused by the same strain of the E. coli bacteria as the previous cases. REUTERS/Todd Korol (CANADA - Tags: BUSINESS FOOD) 

XL Foods workers listen to Doug O'Halloran, president of the United Food and Commercial Workers Local 401, during a news conference stating that XL Foods are still refusing to address food safety issues flagged by the union in Brooks, Alberta, October 10, 2012. Ten people have now fallen sick from contaminated beef products from the XL Foods plant, health officials said on Saturday. Four previous cases were also in Alberta, and officials say they have evidence that these victims ate meat produced by the XL Foods plant in Brooks, Alberta. The Canadian officials said the six new cases were caused by the same strain of the E. coli bacteria as the previous cases. REUTERS/Todd Korol (CANADA - Tags: BUSINESS FOOD) 

Doug O?Halloran, president of the United Food and Commercial Workers Local 401, holds a news conference stating that XL Foods are still refusing to address food safety issues flagged by the union in Brooks, Alberta, October 10, 2012. Ten people have now fallen sick from contaminated beef products from the XL Foods plant, health officials said on Saturday. Four previous cases were also in Alberta, and officials say they have evidence that these victims ate meat produced by the XL Foods plant in Brooks, Alberta. The Canadian officials said the six new cases were caused by the same strain of the E. coli bacteria as the previous cases. REUTERS/Todd Korol (CANADA - Tags: BUSINESS FOOD) 

Doug O?Halloran, president of the United Food and Commercial Workers Local 401, holds a news conference stating that XL Foods are still refusing to address food safety issues flagged by the union in Brooks, Alberta, October 10, 2012. Ten people have now fallen sick from contaminated beef products from the XL Foods plant, health officials said on Saturday. Four previous cases were also in Alberta, and officials say they have evidence that these victims ate meat produced by the XL Foods plant in Brooks, Alberta. The Canadian officials said the six new cases were caused by the same strain of the E. coli bacteria as the previous cases. REUTERS/Todd Korol (CANADA - Tags: BUSINESS FOOD) 

Doug O?Halloran, president of the United Food and Commercial Workers Local 401, holds a news conference stating that XL Foods are still refusing to address food safety issues flagged by the union in Brooks, Alberta, October 10, 2012. Ten people have now fallen sick from contaminated beef products from the XL Foods plant, health officials said on Saturday. Four previous cases were also in Alberta, and officials say they have evidence that these victims ate meat produced by the XL Foods plant in Brooks, Alberta. The Canadian officials said the six new cases were caused by the same strain of the E. coli bacteria as the previous cases. REUTERS/Todd Korol (CANADA - Tags: HEADSHOT BUSINESS FOOD) 

Doug O?Halloran, president of the United Food and Commercial Workers Local 401, holds a news conference stating that XL Foods are still refusing to address food safety issues flagged by the union in Brooks, Alberta, October 10, 2012. Ten people have now fallen sick from contaminated beef products from the XL Foods plant, health officials said on Saturday. Four previous cases were also in Alberta, and officials say they have evidence that these victims ate meat produced by the XL Foods plant in Brooks, Alberta. The Canadian officials said the six new cases were caused by the same strain of the E. coli bacteria as the previous cases. REUTERS/Todd Korol (CANADA - Tags: BUSINESS FOOD) 

Workers read a news release from United Food and Commercial Workers Local 401 during a news conference in Brooks, Alberta, October 10, 2012. Ten people have now fallen sick from contaminated beef products from the XL Foods plant, health officials said on Saturday. Four previous cases were also in Alberta, and officials say they have evidence that these victims ate meat produced by the XL Foods plant in Brooks, Alberta. The Canadian officials said the six new cases were caused by the same strain of the E. coli bacteria as the previous cases. REUTERS/Todd Korol (CANADA - Tags: BUSINESS FOOD) 

Doug O?Halloran, president of the United Food and Commercial Workers Local 401, holds a news conference stating that XL Foods are still refusing to address food safety issues flagged by the union in Brooks, Alberta, October 10, 2012. Ten people have now fallen sick from contaminated beef products from the XL Foods plant, health officials said on Saturday. Four previous cases were also in Alberta, and officials say they have evidence that these victims ate meat produced by the XL Foods plant in Brooks, Alberta. The Canadian officials said the six new cases were caused by the same strain of the E. coli bacteria as the previous cases. REUTERS/Todd Korol (CANADA - Tags: FOOD BUSINESS) 

The XL Foods plant sits idle in Brooks, Alberta, October 10, 2012. Ten people have now fallen sick from contaminated beef products from the XL Foods plant, health officials said on Saturday. Four previous cases were also in Alberta, and officials say they have evidence that these victims ate meat produced by the XL Foods plant in Brooks, Alberta. The Canadian officials said the six new cases were caused by the same strain of the E. coli bacteria as the previous cases. REUTERS/Todd Korol (CANADA - Tags: BUSINESS HEALTH FOOD) 

The XL Foods plant sits idle behind a cattle fence in Brooks, Alberta, October 10, 2012. Ten people have now fallen sick from contaminated beef products from the XL Foods plant, health officials said on Saturday. Four previous cases were also in Alberta, and officials say they have evidence that these victims ate meat produced by the XL Foods plant in Brooks, Alberta. The Canadian officials said the six new cases were caused by the same strain of the E. coli bacteria as the previous cases. REUTERS/Todd Korol (CANADA - Tags: BUSINESS HEALTH FOOD) 

Buses that bring workers to the plant remained parked at the XL Foods plant that sits idle in Brooks, Alberta, October 10, 2012. Ten people have now fallen sick from contaminated beef products from the XL Foods plant, health officials said on Saturday. Four previous cases were also in Alberta, and officials say they have evidence that these victims ate meat produced by the XL Foods plant in Brooks, Alberta. The Canadian officials said the six new cases were caused by the same strain of the E. coli bacteria as the previous cases. REUTERS/Todd Korol (CANADA - Tags: BUSINESS HEALTH FOOD) 

A Canadian flag flies over the XL Foods plant that sits idle in Brooks, Alberta, October 10, 2012. Ten people have now fallen sick from contaminated beef products from the XL Foods plant, health officials said on Saturday. Four previous cases were also in Alberta, and officials say they have evidence that these victims ate meat produced by the XL Foods plant in Brooks, Alberta. The Canadian officials said the six new cases were caused by the same strain of the E. coli bacteria as the previous cases. REUTERS/Todd Korol (CANADA - Tags: BUSINESS ANIMALS HEALTH) 

Cattle graze in a field near the XL Foods plant that sits idle in Brooks, Alberta, October 10, 2012. Ten people have now fallen sick from contaminated beef products from the XL Foods plant, health officials said on Saturday. Four previous cases were also in Alberta, and officials say they have evidence that these victims ate meat produced by the XL Foods plant in Brooks, Alberta. The Canadian officials said the six new cases were caused by the same strain of the E. coli bacteria as the previous cases. REUTERS/Todd Korol (CANADA - Tags: BUSINESS ANIMALS HEALTH) 

Ground Alberta beef is seen before packaging at Bon Ton Meat Market in Calgary, Alberta, October 3, 2012. Bon Ton stated it was not effected by the recent E.Coli outbreak as they get their meat from select smaller producers. E. coli, a strain of which can cause sickness or even death, is widely present in meat-processing plants, and regulators require packers to control the bacteria within certain levels. E.coli can be killed by thoroughly cooking meat. REUTERS/Todd Korol (CANADA - Tags: FOOD HEALTH) 

Clayton Colliou, a butcher at Bon Ton Meat Market, works with choice cuts of Alberta beef in Calgary, Alberta, October 3, 2012. Bon Ton stated it was not effected by the recent E.Coli outbreak as they get their meat from select smaller producers. E. coli, a strain of which can cause sickness or even death, is widely present in meat-processing plants, and regulators require packers to control the bacteria within certain levels. E.coli can be killed by thoroughly cooking meat. REUTERS/Todd Korol (CANADA - Tags: FOOD HEALTH) 

A butcher wraps Ground Alberta beef at Bon Ton Meat Market in Calgary, Alberta, October 3, 2012. Bon Ton stated it was not effected by the recent E.Coli outbreak as they get their meat from select smaller producers. E. coli, a strain of which can cause sickness or even death, is widely present in meat-processing plants, and regulators require packers to control the bacteria within certain levels. E.coli can be killed by thoroughly cooking meat. REUTERS/Todd Korol (CANADA - Tags: FOOD HEALTH) 

Ground Alberta beef in seen in coolers at Bon Ton Meat Market in Calgary, Alberta, October 3, 2012. Bon Ton stated it was not effected by the recent E.Coli outbreak as they get their meat from select smaller producers. E. coli, a strain of which can cause sickness or even death, is widely present in meat-processing plants, and regulators require packers to control the bacteria within certain levels. E.coli can be killed by thoroughly cooking meat. REUTERS/Todd Korol (CANADA - Tags: FOOD HEALTH) 

Clayton Colliou, a butcher at Bon Ton Meat Market, organizes choice cuts of Alberta beef in Calgary, Alberta, October 3, 2012. Bon Ton stated it was not effected by the recent E.Coli outbreak as they get their meat from select smaller producers. E. coli, a strain of which can cause sickness or even death, is widely present in meat-processing plants, and regulators require packers to control the bacteria within certain levels. E.coli can be killed by thoroughly cooking meat. REUTERS/Todd Korol (CANADA - Tags: FOOD HEALTH) 

Clayton Colliou, a meat cutter at Bon Ton Meat Market, cuts choice cuts of Alberta beef in Calgary, Alberta, October 3, 2012. Bon Ton stated it was not effected by the recent E.Coli outbreak as they get their meat from select smaller producers. E. coli, a strain of which can cause sickness or even death, is widely present in meat-processing plants, and regulators require packers to control the bacteria within certain levels. E.coli can be killed by thoroughly cooking meat. REUTERS/Todd Korol (CANADA - Tags: FOOD HEALTH) 

Clayton Colliou, meat cutter at Bon Ton Meat Market, cuts choice cuts of Alberta beef in Calgary, Alberta, October 3, 2012. Bon Ton stated it was not effected by the recent E.Coli outbreak as they get their meat from select smaller producers. E. coli, a strain of which can cause sickness or even death, is widely present in meat-processing plants, and regulators require packers to control the bacteria within certain levels. E.coli can be killed by thoroughly cooking meat. REUTERS/Todd Korol (CANADA - Tags: HEALTH FOOD) 

Canadian Food Inspection Agency (CFIA) President George Da Pont answers questions on the E.Coli outbreak in Canada during a news conference at the CFIA Laboratory in Calgary, Alberta, October 3, 2012. REUTERS/Todd Korol (CANADA - Tags: POLITICS AGRICULTURE HEALTH) 

Canada's Agriculture Minister Gerry Ritz (C) and Canadian Food Inspection Agency (CFIA) President George Da Pont (R) provide an update on the E. Coli outbreak in Canada, during a news conference at the CFIA Laboratory in Calgary, Alberta, October 3, 2012. REUTERS/Todd Korol (CANADA - Tags: HEALTH FOOD AGRICULTURE) 

Canada's Agriculture Minister Gerry Ritz answers questions regarding the E. Coli outbreak in Canada, during a news conference at the Canadian Food Inspection Agency (CFIA) Laboratory in Calgary, Alberta, October 3, 2012. REUTERS/Todd Korol (CANADA - Tags: HEALTH FOOD AGRICULTURE HEADSHOT) 

Canada's Agriculture Minister Gerry Ritz leaves a news conference after answering questions regarding the E. Coli outbreak in Canada, at the Canadian Food Inspection Agency (CFIA) Laboratory in Calgary, Alberta, October 3, 2012. REUTERS/Todd Korol (CANADA - Tags: HEALTH FOOD AGRICULTURE) 

Canada's Agriculture Minister Gerry Ritz (R) answers questions regarding the E. Coli outbreak in Canada, during a news conference at the Canadian Food Inspection Agency (CFIA) Laboratory in Calgary, Alberta, October 3, 2012. REUTERS/Todd Korol (CANADA - Tags: HEALTH FOOD AGRICULTURE) 

Canada's Agriculture Minister Gerry Ritz (C) and Canadian Food Inspection Agency (CFIA) President George Da Pont (R) provide an update on the E. Coli outbreak in Canada, during a news conference at the CFIA Laboratory in Calgary, Alberta, October 3, 2012. REUTERS/Todd Korol (CANADA - Tags: HEALTH FOOD AGRICULTURE) 

Canada's Agriculture Minister Gerry Ritz answers questions regarding the E. Coli outbreak in Canada, during a news conference at the Canadian Food Inspection Agency (CFIA) Laboratory in Calgary, Alberta, October 3, 2012. REUTERS/Todd Korol (CANADA - Tags: HEALTH FOOD AGRICULTURE HEADSHOT) 

Hereford Angus Cross cattle are pictured on the Bell L ranch near Airdrie, Alberta, September 30, 2012. Cattle prices in Alberta have dropped after beef products were voluntarily recalled by XL Foods, whose plant in Brooks, Alberta, was temporarily shut by the agency after contaminated beef products sickened several people. REUTERS/Todd Korol (CANADA - Tags: AGRICULTURE HEALTH ANIMALS) 

Hereford Angus Cross cattle are pictured on the Bell L ranch near Airdrie, Alberta, September 30, 2012. Cattle prices in Alberta have dropped after beef products were voluntarily recalled by XL Foods, whose plant in Brooks, Alberta, was temporarily shut by the agency after contaminated beef products sickened several people. REUTERS/Todd Korol (CANADA - Tags: AGRICULTURE HEALTH ANIMALS) 

A Hereford Angus Cross cow is pictured on the Bell L ranch near Airdrie, Alberta, September 30, 2012. Cattle prices in Alberta have dropped after beef products were voluntarily recalled by XL Foods, whose plant in Brooks, Alberta, was temporarily shut by the agency after contaminated beef products sickened several people. REUTERS/Todd Korol (CANADA - Tags: AGRICULTURE HEALTH ANIMALS) 

A Hereford Angus Cross cow is pictured on the Bell L ranch near Airdrie, Alberta, September 30, 2012. Cattle prices in Alberta have dropped after beef products were voluntarily recalled by XL Foods, whose plant in Brooks, Alberta, was temporarily shut by the agency after contaminated beef products sickened several people. REUTERS/Todd Korol (CANADA - Tags: AGRICULTURE HEALTH ANIMALS) 

Cattle are pictured on the Bell L ranch near Airdrie, Alberta, September 30, 2012. Cattle prices in Alberta have dropped after beef products were voluntarily recalled by XL Foods, whose plant in Brooks, Alberta, was temporarily shut by the agency after contaminated beef products sickened several people. REUTERS/Todd Korol (CANADA - Tags: POLITICS AGRICULTURE ANIMALS HEALTH) 

Alberta Premier Alison Redford arrives to discuss the E. coli outbreak with cattle ranchers at the Bell L ranch near Airdrie, Alberta, September 30, 2012. The Canadian Food Inspection Agency (CFIA) on Sunday released a list of dozens of products made from beef voluntarily recalled by XL Foods, whose plant in Brooks, Alberta, was temporarily shut by the agency after contaminated beef products sickened several people. REUTERS/Todd Korol (CANADA - Tags: POLITICS HEALTH AGRICULTURE) 

Alberta Premier Alison Redford (C) answers questions during a news conference regarding the E. coli outbreak after a meeting with cattle ranchers at the Bell L ranch near Airdrie, Alberta, September 30, 2012. The Canadian Food Inspection Agency (CFIA) on Sunday released a list of dozens of products made from beef voluntarily recalled by XL Foods, whose plant in Brooks, Alberta, was temporarily shut by the agency after contaminated beef products sickened several people. REUTERS/Todd Korol (CANADA - Tags: POLITICS HEALTH) 

Alberta Premier Alison Redford (C) answers questions during a news conference regarding the E. coli outbreak after a meeting with cattle ranchers at the Bell L ranch near Airdrie, Alberta, September 30, 2012. The Canadian Food Inspection Agency (CFIA) on Sunday released a list of dozens of products made from beef voluntarily recalled by XL Foods, whose plant in Brooks, Alberta, was temporarily shut by the agency after contaminated beef products sickened several people. REUTERS/Todd Korol (CANADA - Tags: POLITICS HEALTH) 

Alberta Premier Alison Redford leaves after discussing about an E. coli outbreak with cattle ranchers at the Bell L ranch near Airdrie, Alberta, September 30, 2012. The Canadian Food Inspection Agency (CFIA) on Sunday released a list of dozens of products made from beef voluntarily recalled by XL Foods, whose plant in Brooks, Alberta, was temporarily shut by the agency after contaminated beef products sickened several people. REUTERS/Todd Korol (CANADA - Tags: POLITICS HEALTH) 

Alberta Premier Alison Redford (R) meets Alberta Livestock and Meat Agency's David Chalack at the Bell L ranch near Airdrie, Alberta, September 30, 2012, during a meeting with cattle ranchers discussing an E. coli outbreak. The Canadian Food Inspection Agency (CFIA) on Sunday released a list of dozens of products made from beef voluntarily recalled by XL Foods, whose plant in Brooks, Alberta, was temporarily shut by the agency after contaminated beef products sickened several people. REUTERS/Todd Korol (CANADA - Tags: POLITICS HEALTH) 

Alberta Premier Alison Redford (4th L) discusses the E. coli outbreak during a meeting with cattle ranchers at the Bell L ranch near Airdrie, Alberta, September 30, 2012. The Canadian Food Inspection Agency (CFIA) on Sunday released a list of dozens of products made from beef voluntarily recalled by XL Foods, whose plant in Brooks, Alberta, was temporarily shut by the agency after contaminated beef products sickened several people. REUTERS/Todd Korol (CANADA - Tags: POLITICS HEALTH) 

Alberta Premier Alison Redford (C) discusses the E. coli outbreak during a meeting with cattle ranchers at the Bell L ranch near Airdrie, Alberta, September 30, 2012. The Canadian Food Inspection Agency (CFIA) on Sunday released a list of dozens of products made from beef voluntarily recalled by XL Foods, whose plant in Brooks, Alberta, was temporarily shut by the agency after contaminated beef products sickened several people. REUTERS/Todd Korol (CANADA - Tags: POLITICS HEALTH) 

A worker throws away cucumbers to be destroyed at an agriculture facility near Bucharest June 6, 2011 as sales collapsed in Romania's markets due to the fear of E.coli contamination. The workers from this facility are destroying about 1500 tonnes of harvested cucumbers from the last three days, despite negative E.coli laboratory tests, according to local media. The outbreak, centred on the north German city of Hamburg, has made more than 1,500 people ill in eight European countries, and led to an international row over the source of the contamination. REUTERS/Bogdan Cristel (ROMANIA - Tags: AGRICULTURE BUSINESS HEALTH FOOD) BEST QUALITY AVAILABLE 

The plant watering system is seen shut down at a farm where E.coli bacteria was found in Nieder-Erlenbach on the outskirts of Frankfurt, June 18, 2011. Health authorities announced that EHEC bacterias were found in a nearby runnel which supplied the farm watering system close to a purification plant. Some 37 people have been killed and more than 3,200 people have so far been taken ill with the E.coli strain, about a quarter of them developing a complication called haemolytic uraemic syndrome, which affects the blood, kidneys and nervous system. German health authorities have linked the EHEC bacteria (enterohaemorrhagic Escherichia coli) epidemic to contaminated bean sprouts and shoots from a German organic farm sold to consumers and restaurants across the country for eating in salads. REUTERS/Kai Pfaffenbach (GERMANY - Tags: DISASTER ENVIRONMENT HEALTH) 

The plant watering system is seen shut down at a farm where E.coli bacteria was found in Nieder-Erlenbach on the outskirts of Frankfurt, June 18, 2011. Health authorities announced that EHEC bacterias were found in a nearby runnel which supplied the farm watering system close to a purification plant. Some 37 people have been killed and more than 3,200 people have so far been taken ill with the E.coli strain, about a quarter of them developing a complication called haemolytic uraemic syndrome, which affects the blood, kidneys and nervous system. German health authorities have linked the EHEC bacteria (enterohaemorrhagic Escherichia coli) epidemic to contaminated bean sprouts and shoots from a German organic farm sold to consumers and restaurants across the country for eating in salads. REUTERS/Kai Pfaffenbach (GERMANY - Tags: DISASTER ENVIRONMENT HEALTH) 

An overview shows the purification plant of Ober-Erlenbach where EHEC bacteria was found on the outskirts of Frankfurt, June 18, 2011. Some 37 people have been killed and more than 3,200 people have so far been taken ill with the E.coli strain, about a quarter of them developing a complication called haemolytic uraemic syndrome, which affects the blood, kidneys and nervous system. German health authorities have linked the EHEC bacteria (enterohaemorrhagic Escherichia coli) epidemic to contaminated bean sprouts and shoots from a German organic farm sold to consumers and restaurants across the country for eating in salads. REUTERS/Kai Pfaffenbach (GERMANY - Tags: DISASTER ENVIRONMENT HEALTH) 

A customer takes a caddy outside a Lidl store in Saint Sebastien-sur-Loire near Nantes, June 16 2011. Privately owned German discount chain Lidl withdrew boxes of the frozen beef patties after five children were admitted to hospital in northern France after eating beef burgers infected with a strain of E.coli bacteria and believed to be behind the French infections. REUTERS/Stephane Mahe (FRANCE - Tags: FOOD HEALTH) 

Customers enter a Lidl store in Saint Sebastien-sur-Loire near Nantes, June 16 2011. Privately owned German discount chain Lidl withdrew boxes of the frozen beef patties after five children were admitted to hospital in northern France after eating beef burgers infected with a strain of E.coli bacteria and believed to be behind the French infections. REUTERS/Stephane Mahe (FRANCE - Tags: FOOD HEALTH) 

A vendor sells vegetables at a market in central Belgrade June 11, 2011. Germany said on Friday that deadly E.coli bacteria that have killed 31 people and hit farmers across Europe almost certainly came from contaminated bean sprouts grown at an organic farm in northern Germany. REUTERS/Ivan Milutinovic (SERBIA - Tags: HEALTH AGRICULTURE POLITICS FOOD) 

A vendor sells vegetables at a market in central Belgrade June 11, 2011. Germany said on Friday that deadly E.coli bacteria that have killed 31 people and hit farmers across Europe almost certainly came from contaminated bean sprouts grown at an organic farm in northern Germany. REUTERS/Ivan Milutinovic (SERBIA - Tags: HEALTH AGRICULTURE POLITICS FOOD) 

A vendor sells vegetables at a market in central Belgrade June 11, 2011. Germany said on Friday that deadly E.coli bacteria that have killed 31 people and hit farmers across Europe almost certainly came from contaminated bean sprouts grown at an organic farm in northern Germany. REUTERS/Ivan Milutinovic (SERBIA - Tags: HEALTH AGRICULTURE POLITICS FOOD) 

Tomatoes are seen as a vendor sells vegetables at a greens market in central Belgrade June 11, 2011. Germany said on Friday that deadly E.coli bacteria that have killed 31 people and hit farmers across Europe almost certainly came from contaminated bean sprouts grown at an organic farm in northern Germany. REUTERS/Ivan Milutinovic (SERBIA - Tags: AGRICULTURE HEALTH) 

Reinhard Burger, head of the Robert Koch Institute (RKI), addresses the media in Berlin, June 10, 2011. New data shows that bean sprouts are the most likely source of the outbreak of E.coli which has killed 30 people so far, all but one of them in Germany, the country's health authorities said on Friday. REUTERS/Tobias Schwarz (GERMANY - Tags: POLITICS HEALTH SOCIETY SCI TECH) 

President of the German federal institute for risk assessment (BfR) Andeas Hensel (L) and head of the Robert Koch Institute (RKI) Reinhard Burger address the media in Berlin, June 10, 2011. New data shows that bean sprouts are the most likely source of the outbreak of E.coli which has killed 30 people so far, all but one of them in Germany, the country's health authorities said on Friday. REUTERS/Tobias Schwarz (GERMANY - Tags: POLITICS HEALTH SOCIETY SCI TECH)