Hirotsu Bio Science Chief Technical Officer Eric Di Luccio examines nematodes in a petri dish during a photo opportunity at the company's lab in Fujisawa, Kanagawa Prefecture, Japan November 28, 2022. REUTERS/Kim Kyung-Hoon 

Hirotsu Bio Science Chief Technical Officer Eric Di Luccio examines nematodes in a petri dish during a photo opportunity at the company's lab in Fujisawa, Kanagawa Prefecture, Japan November 28, 2022. REUTERS/Kim Kyung-Hoon 

Hirotsu Bio Science Chief Technical Officer Eric Di Luccio examines nematodes in a petri dish during a photo opportunity at the company's lab in Fujisawa, Kanagawa Prefecture, Japan November 28, 2022. REUTERS/Kim Kyung-Hoon 

Hirotsu Bio Science Chief Technical Officer Eric Di Luccio poses with nematodes in a petri dish during a photo opportunity at the company's lab in Fujisawa, Kanagawa Prefecture, Japan November 28, 2022. REUTERS/Kim Kyung-Hoon 

Petri dishes used by a research team who, as they say, have developed an implant of genetically engineered cells into the injured spinal cord of paralysed mice that has helped them walk again, are seen at a laboratory at Tel Aviv University, Israel February 6, 2022. Picture taken February 6, 2022. REUTERS/Amir Cohen 

An employee of the Ludwig Maximilian University in Munich (LMU) holds a petri dish with oocytes from the ovaries of pigs at the Badersfeld bog test farm in Oberschleissheim, Germany, January 24, 2022. Scientists at LMU are using genetic engineering to grow donor organs in pigs. Picture taken January 24, 2022. REUTERS/Lukas Barth 

Osaka University Professor Michiya Matsusaki holds a Petri dish with cultured Wagyu beef at a lab at the university in Suita, Osaka Prefecture, Japan October 5, 2021. Picture taken on October 5, 2021. REUTERS/Akira Tomoshige 

Osaka University Professor Michiya Matsusaki holds a Petri dish with cultured Wagyu beef at a lab at the university in Suita, Osaka Prefecture, Japan October 5, 2021. Picture taken on October 5, 2021. REUTERS/Akira Tomoshige 

Durian husk and petri dish containing cellulose hydrogel sheet made out of durian husk with yeast phenolics are seen in Singapore September 16, 2021. Picture taken September 16, 2021. REUTERS/Lee Ying Shan 

Petri dish containing different steps and procedures by Nanyang Technology University (NTU) to turn durian husks into antimicrobial bandages, with final bandage product juxtaposed against commercial bandage at bottom right corner are seen in Singapore September 16, 2021. Picture taken September 16, 2021. REUTERS/Lee Ying Shan 

Marcel Walser, Director Lead Generation of Swiss biotechnology company Molecular Partners displays a petri dish containing bacterial colonies in a laboratory at the company's headquarters in Schlieren, Switzerland August 11, 2020. REUTERS/Arnd Wiegmann 

A freshly-harvested medical cannabis flower is seen in a Petri dish at Pharmocann, an Israeli medical cannabis company in northern Israel June 24, 2020. Picture taken June 24, 2020. REUTERS/Amir Cohen 

PhD student Collins Kipkorir Kebeni holds a petri dish containing samples of black rhinos' excrements at the Zoology lab of the Maseno University, in Maseno, western Kenya, January 30, 2020. Picture taken January 30, 2020. REUTERS/Baz Ratner 

Ka Yi Ling, co-founder and chief scientific officer at Shiok Meats, injects nutrient solution into a petri dish to grow stem cells of shrimp meat, in Singapore January 22, 2020. Picture taken January 22, 2020. REUTERS/Travis Teo 

German Chancellor Angela Merkel talks to Zoe Mendelsohn, Nikolaus Rajewsky and Martin Lohse beside seven-week-old "mini-brain" (organoid) in a petri dish under the microscope as she visits the new research building of the Max Delbrueck Center for Molecular Medicine (MDC) in Berlin, Germany, February 26, 2019. Photo: Bernd von Jutrczenka/Pool via Reuters 

German Chancellor Angela Merkel talks to Zoe Mendelsohn, Nikolaus Rajewsky and Martin Lohse beside seven-week-old "mini-brain" (organoid) in a petri dish under the microscope as she visits the new research building of the Max Delbrueck Center for Molecular Medicine (MDC) in Berlin, Germany, February 26, 2019. Photo: Bernd von Jutrczenka/Pool via Reuters 

Sea lice, parasites slowing the expansion of Norway's salmon-farming industry, are seen in a Petri dish at Cargill's research centre in Dirdal, Norway, August 1, 2018. Picture taken August 1, 2018. To match Special Report OCEANS-TIDE/FUTURE REUTERS/Clodagh Kilcoyne 

A researcher shows petri dishes containing Lactobacillus colonies forming at Otemchi Biotechnology's laboratory in Singapore April 24, 2015. In barns filled with classical music and lighting that changes to match the hues outside, rows of chickens are fed a diet rich in probiotics, a regimen designed to remove the need for the drugs and chemicals that have tainted the global food chain. The Lactobacillus is produced in the lab to mix with chicken feed for Kee Song Brothers' drug-free poultry farms. Picture taken April 24, 2015. To match POULTRY-DRUG/ REUTERS/Edgar Su 

A researcher counts Lactobacillus colonies forming in a petri dish at Otemchi Biotechnology's laboratory in Singapore April 24, 2015. In barns filled with classical music and lighting that changes to match the hues outside, rows of chickens are fed a diet rich in probiotics, a regimen designed to remove the need for the drugs and chemicals that have tainted the global food chain. The Lactobacillus is produced in the lab to mix with chicken feed for Kee Song Brothers' drug-free poultry farms. Picture taken April 24, 2015. To match POULTRY-DRUG/ REUTERS/Edgar Su

Lara Alpan, a Monsanto tour guide, shows how a plant grows in petri dishes in the Monsanto research facility in Chesterfield, Missouri, July 28, 2014. Monsanto says their technology-driven plant breeding process is focused on improving the overall genetics of a crop, using parents with characteristics such as disease tolerance, size or baking qualities. Picture taken July 28, 2014. 10 of 25 Monsanto Stand Alone Picture Package. REUTERS/Tom Gannam (UNITED STATES - Tags: ENVIRONMENT FOOD SCIENCE TECHNOLOGY AGRICULTURE) 

Lara Alpan, a Monsanto tour guide, shows how a plant grows in petri dishes in the Monsanto research facility in Chesterfield, Missouri, July 28, 2014. Monsanto says their technology-driven plant breeding process is focused on improving the overall genetics of a crop, using parents with characteristics such as disease tolerance, size or baking qualities. Picture taken July 28, 2014. 9 of 25 Monsanto Stand Alone Picture Package. REUTERS/Tom Gannam (UNITED STATES - Tags: ENVIRONMENT FOOD SCIENCE TECHNOLOGY AGRICULTURE) 

Lara Alpan, a Monsanto tour guide, shows how a plant grows in petri dishes in the Monsanto research facility in Chesterfield, Missouri, July 28, 2014. Monsanto says their technology-driven plant breeding process is focused on improving the overall genetics of a crop, using parents with characteristics such as disease tolerance, size or baking qualities. Picture taken July 28, 2014. 11 of 25 Monsanto Stand Alone Picture Package. REUTERS/Tom Gannam (UNITED STATES - Tags: ENVIRONMENT FOOD SCIENCE TECHNOLOGY AGRICULTURE) 

Doctor for tropical medicine Florian Steiner demonstrates the testing of a blood sample at the quarantine station for patients with infectious diseases at the Charite hospital in Berlin August 11, 2014. The isolation ward at the Charite is one of several centres in Germany equipped to treat patients suffering from ebola and other highly infectious diseases, the clinic's doctor for tropical medicine Florian Steiner said. Ebola is one of the deadliest diseases known to humanity. It has no proven cure and there is no vaccine to prevent infection. The most effective treatment involves alleviating symptoms that include fever, vomiting and diarrhoea. The rigorous use of quarantine is needed to prevent its spread, as well as high standards of hygiene for anyone who might come into contact with the disease. REUTERS/Thomas Peter (GERMANY - Tags: HEALTH) 

Professor Mark Post gestures during a launch event for the world's first lab-grown beef burger, in west London August 5, 2013. The in-vitro burger, cultured from cattle stem cells, the first example of what its creator says could provide an answer to global food shortages and help combat climate change, was fried in a pan and tasted by two volunteers. The burger is the result of years of research by Post, a vascular biologist at the University of Maastricht, who is working to show how meat grown in petri dishes might one day be a true alternative to meat from livestock.The meat in the burger has been made by knitting together around 20,000 strands of protein that has been cultured from cattle stem cells in Post's lab. REUTERS/Toby Melville (BRITAIN - Tags: ANIMALS ENVIRONMENT FOOD SCIENCE TECHNOLOGY) 

Josh Schonwald, a US-based food writer, tastes the world's first lab-grown beef burger during a launch event in west London August 5, 2013. The in-vitro burger, cultured from cattle stem cells, the first example of what its creator says could provide an answer to global food shortages and help combat climate change, was fried in a pan and tasted by two volunteers. The burger is the result of years of research by Dutch scientist Mark Post, a vascular biologist at the University of Maastricht, who is working to show how meat grown in petri dishes might one day be a true alternative to meat from livestock.The meat in the burger has been made by knitting together around 20,000 strands of protein that has been cultured from cattle stem cells in Post's lab. REUTERS/Toby Melville (BRITAIN - Tags: ENVIRONMENT SCIENCE TECHNOLOGY FOOD ANIMALS) 

Hanni Rutzler, a food researcher from Austria, tastes the world's first lab-grown beef burger during a launch event in west London August 5, 2013. The in-vitro burger, cultured from cattle stem cells, the first example of what its creator says could provide an answer to global food shortages and help combat climate change, was fried in a pan and tasted by two volunteers. The burger is the result of years of research by Dutch scientist Mark Post, a vascular biologist at the University of Maastricht, who is working to show how meat grown in petri dishes might one day be a true alternative to meat from livestock.The meat in the burger has been made by knitting together around 20,000 strands of protein that has been cultured from cattle stem cells in Post's lab. REUTERS/Toby Melville (BRITAIN - Tags: ENVIRONMENT SCIENCE TECHNOLOGY ANIMALS FOOD) 

Chef Richard McGeown cooks the world's first lab-grown beef burger during a launch event in west London August 5, 2013. The in-vitro burger, cultured from cattle stem cells, the first example of what its creator says could provide an answer to global food shortages and help combat climate change, was fried in a pan and tasted by two volunteers. The burger is the result of years of research by Dutch scientist Mark Post, a vascular biologist at the University of Maastricht, who is working to show how meat grown in petri dishes might one day be a true alternative to meat from livestock.The meat in the burger has been made by knitting together around 20,000 strands of protein that has been cultured from cattle stem cells in Post's lab. REUTERS/Toby Melville (BRITAIN - Tags: ANIMALS ENVIRONMENT FOOD SCIENCE TECHNOLOGY) 

Hanni Rutzler, a food researcher from Austria, tastes the world's first lab-grown beef burger during a launch event in west London, August 5, 2013. The in-vitro burger, cultured from cattle stem cells, the first example of what its creator says could provide an answer to global food shortages and help combat climate change, was fried in a pan and tasted by two volunteers. The burger is the result of years of research by Dutch scientist Mark Post, a vascular biologist at the University of Maastricht, who is working to show how meat grown in petri dishes might one day be a true alternative to meat from livestock.The meat in the burger has been made by knitting together around 20,000 strands of protein that has been cultured from cattle stem cells in Post's lab. REUTERS/Toby Melville (BRITAIN - Tags: ENVIRONMENT SCIENCE TECHNOLOGY ANIMALS FOOD) 

A photographer shoots in a television studio with a live screen view behind as the world's first lab-grown beef burger is cooked during a launch event in west London, August 5, 2013. The in-vitro burger, cultured from cattle stem cells, the first example of what its creator says could provide an answer to global food shortages and help combat climate change, was fried in a pan and tasted by two volunteers. The burger is the result of years of research by Dutch scientist Mark Post, a vascular biologist at the University of Maastricht, who is working to show how meat grown in petri dishes might one day be a true alternative to meat from livestock.The meat in the burger has been made by knitting together around 20,000 strands of protein that has been cultured from cattle stem cells in Post's lab. REUTERS/Toby Melville (BRITAIN - Tags: ENVIRONMENT SCIENCE TECHNOLOGY ANIMALS FOOD) 

Hanni Rutzler, a food researcher from Austria, tastes the world's first lab-grown beef burger during a launch event in west London, August 5, 2013. The in-vitro burger, cultured from cattle stem cells, the first example of what its creator says could provide an answer to global food shortages and help combat climate change, was fried in a pan and tasted by two volunteers. The burger is the result of years of research by Dutch scientist Mark Post, a vascular biologist at the University of Maastricht, who is working to show how meat grown in petri dishes might one day be a true alternative to meat from livestock.The meat in the burger has been made by knitting together around 20,000 strands of protein that has been cultured from cattle stem cells in Post's lab. REUTERS/Toby Melville (BRITAIN - Tags: ENVIRONMENT SCIENCE TECHNOLOGY ANIMALS FOOD) 

Josh Schonwald, a US-based food writer, tastes the world's first lab-grown beef burger during a launch event in west London, August 5, 2013. The in-vitro burger, cultured from cattle stem cells, the first example of what its creator says could provide an answer to global food shortages and help combat climate change, was fried in a pan and tasted by two volunteers. The burger is the result of years of research by Dutch scientist Mark Post, a vascular biologist at the University of Maastricht, who is working to show how meat grown in petri dishes might one day be a true alternative to meat from livestock.The meat in the burger has been made by knitting together around 20,000 strands of protein that has been cultured from cattle stem cells in Post's lab. REUTERS/Toby Melville (BRITAIN - Tags: ENVIRONMENT SCIENCE TECHNOLOGY FOOD ANIMALS) 

Josh Schonwald, a US-based food writer, tastes the world's first lab-grown beef burger during a launch event in west London, August 5, 2013. The in-vitro burger, cultured from cattle stem cells, the first example of what its creator says could provide an answer to global food shortages and help combat climate change, was fried in a pan and tasted by two volunteers. The burger is the result of years of research by Dutch scientist Mark Post, a vascular biologist at the University of Maastricht, who is working to show how meat grown in petri dishes might one day be a true alternative to meat from livestock.The meat in the burger has been made by knitting together around 20,000 strands of protein that has been cultured from cattle stem cells in Post's lab. REUTERS/Toby Melville (BRITAIN - Tags: ENVIRONMENT SCIENCE TECHNOLOGY FOOD ANIMALS) 

Chef Rich McGeown prepares to cook the world's first lab-grown beef burger during a launch event in west London, August 5, 2013. The in-vitro burger, cultured from cattle stem cells, the first example of what its creator says could provide an answer to global food shortages and help combat climate change, was fried in a pan and tasted by two volunteers. The burger is the result of years of research by Dutch scientist Mark Post, a vascular biologist at the University of Maastricht, who is working to show how meat grown in petri dishes might one day be a true alternative to meat from livestock.The meat in the burger has been made by knitting together around 20,000 strands of protein that has been cultured from cattle stem cells in Post's lab. REUTERS/Toby Melville (BRITAIN - Tags: ENVIRONMENT SCIENCE TECHNOLOGY ANIMALS FOOD) 

Josh Schonwald, a US-based food writer, tastes the world's first lab-grown beef burger during a launch event in west London, August 5, 2013. The in-vitro burger, cultured from cattle stem cells, the first example of what its creator says could provide an answer to global food shortages and help combat climate change, was fried in a pan and tasted by two volunteers. The burger is the result of years of research by Dutch scientist Mark Post, a vascular biologist at the University of Maastricht, who is working to show how meat grown in petri dishes might one day be a true alternative to meat from livestock.The meat in the burger has been made by knitting together around 20,000 strands of protein that has been cultured from cattle stem cells in Post's lab. REUTERS/Toby Melville (BRITAIN - Tags: ENVIRONMENT SCIENCE TECHNOLOGY FOOD ANIMALS) 

Josh Schonwald, a US-based food writer, tastes the world's first lab-grown beef burger during a launch event in west London, August 5, 2013. The in-vitro burger, cultured from cattle stem cells, the first example of what its creator says could provide an answer to global food shortages and help combat climate change, was fried in a pan and tasted by two volunteers. The burger is the result of years of research by Dutch scientist Mark Post, a vascular biologist at the University of Maastricht, who is working to show how meat grown in petri dishes might one day be a true alternative to meat from livestock.The meat in the burger has been made by knitting together around 20,000 strands of protein that has been cultured from cattle stem cells in Post's lab. REUTERS/Toby Melville (BRITAIN - Tags: ENVIRONMENT SCIENCE TECHNOLOGY FOOD ANIMALS TPX IMAGES OF THE DAY) 

Chef Rich McGeown prepares to cook the world's first lab-grown beef burger during a launch event in west London, August 5, 2013. The in-vitro burger, cultured from cattle stem cells, the first example of what its creator says could provide an answer to global food shortages and help combat climate change, was fried in a pan and tasted by two volunteers. The burger is the result of years of research by Dutch scientist Mark Post, a vascular biologist at the University of Maastricht, who is working to show how meat grown in petri dishes might one day be a true alternative to meat from livestock.The meat in the burger has been made by knitting together around 20,000 strands of protein that has been cultured from cattle stem cells in Post's lab. REUTERS/Toby Melville (BRITAIN - Tags: ENVIRONMENT SCIENCE TECHNOLOGY ANIMALS FOOD) 

Chef Rich McGeown prepares to cook the world's first lab-grown beef burger during a launch event in west London, August 5, 2013. The in-vitro burger, cultured from cattle stem cells, the first example of what its creator says could provide an answer to global food shortages and help combat climate change, was fried in a pan and tasted by two volunteers. The burger is the result of years of research by Dutch scientist Mark Post, a vascular biologist at the University of Maastricht, who is working to show how meat grown in petri dishes might one day be a true alternative to meat from livestock.The meat in the burger has been made by knitting together around 20,000 strands of protein that has been cultured from cattle stem cells in Post's lab. REUTERS/Toby Melville (BRITAIN - Tags: ENVIRONMENT SCIENCE TECHNOLOGY ANIMALS FOOD) 

Chef Rich McGeown prepares to cook the world's first lab-grown beef burger during a launch event in west London, August 5, 2013. The in-vitro burger, cultured from cattle stem cells, the first example of what its creator says could provide an answer to global food shortages and help combat climate change, was fried in a pan and tasted by two volunteers. The burger is the result of years of research by Dutch scientist Mark Post, a vascular biologist at the University of Maastricht, who is working to show how meat grown in petri dishes might one day be a true alternative to meat from livestock.The meat in the burger has been made by knitting together around 20,000 strands of protein that has been cultured from cattle stem cells in Post's lab. REUTERS/Toby Melville (BRITAIN - Tags: ENVIRONMENT SCIENCE TECHNOLOGY) 

A scientist works in a laboratory at the Complutense Medicine University in Madrid December 4, 2012. Picture taken December 4. REUTERS/Andrea Comas (SPAIN - Tags: SCIENCE TECHNOLOGY BUSINESS EMPLOYMENT) 

Doris Ortiz, Medical Technician 2, prepares samples in the specimen set-up area of the Vanderbilt Clinical Microbiology Lab for patient care, where the fungal meningitis outbreak was first diagnosed, in Nashville, Tennessee on October 19, 2012. 257 people in the United States have been diagnosed with this disease and 20 have died. REUTERS/Harrison McClary (UNITED STATES) 

A Dominican doctor observes Aedes aegypti mosquitos, which can spread the dengue fever, at Centro Nacional de Control de Enfermedades Tropicales (CENCET), or the National Centre for Tropical Diseases Control, in Santo Domingo October 8, 2012. The Dominican government has issued a public health warning against rising incidents of Aedes aegypti dengue disease, which has affected 6,000 people and killed more than 13 in 2012, local media reported. Picture taken October 8, 2012. REUTERS/Ricardo Rojas (DOMINICAN REPUBLIC - Tags: HEALTH SOCIETY) 

Samples of in-vitro meat, or cultured meat grown in a laboratory, are seen at the University of Maastricht November 9, 2011. Scientists are cooking up new ways of feeding the world's ever growing hunger for meat that could save the environment and the lives of millions of animals. In-vitro meat or cultured meat is an animal flesh product that has never been part of a complete, living animal, and is quite different from imitation meat or meat substitutes, which are vegetarian foods made from vegetable proteins like soy. Picture taken November 9. To match Feature SCIENCE-MEAT/ REUTERS/Francois Lenoir (NETHERLANDS - Tags: FOOD SOCIETY SCIENCE TECHNOLOGY) 

A specialist arranges petri dishes for Escherichia coli (E.coli) tests at the Institute of Food Safety, Animal Health and Environment in Riga June 9, 2011. More than 1,600 people have been infected by a toxic strain of E.coli bacteria that has killed at least 17 and may be the deadliest yet in human history. Latvian government officials on Thursday informed media of stringent monitoring and control over its food sources, and the country has yet to be hit with any E.coli related cases. REUTERS/Ints Kalnins (LATVIA - Tags: ENVIRONMENT HEALTH SCI TECH) 

Specialist Jelena Kovalkova looks at a petri dish as she works to isolate the Escherichia coli (E.coli) bacteria strain at the Institute of Food Safety, Animal Health and Environment in Riga June 9, 2011. More than 1,600 people have been infected by a toxic strain of E.coli bacteria that has killed at least 17 and may be the deadliest yet in human history. Latvian government officials on Thursday informed media of stringent monitoring and control over its food sources, and the country has yet to be hit with any E.coli related cases. REUTERS/Ints Kalnins (LATVIA - Tags: ENVIRONMENT HEALTH SCI TECH) 

A petri dish with bacterial strains of EHEC bacteria (enterohaemorrhagic Escherichia coli.) is pictured in the microbiological laboratory of the The Austrian Agency for Health and Food Safety (AGES) in Vienna June 9 , 2011. The German government has been criticised at home and around Europe for failing so far to pin down the cause of the E.coli outbreak that has killed 27 and stricken more than 2,700 people in 12 countries. All cases have been traced back to near Hamburg in northern Germany. REUTERS/Leonhard Foeger (AUSTRIA - Tags: SCI TECH HEALTH) 

A petri dish with bacterial strains of EHEC bacteria (enterohaemorrhagic Escherichia coli.) is pictured in the microbiological laboratory of the The Austrian Agency for Health and Food Safety (AGES) in Vienna June 9 , 2011. The German government has been criticised at home and around Europe for failing so far to pin down the cause of the E.coli outbreak that has killed 27 and stricken more than 2,700 people in 12 countries. All cases have been traced back to near Hamburg in northern Germany. REUTERS/Leonhard Foeger (AUSTRIA - Tags: SCI TECH HEALTH) 

An Austrian scientist points to a petri dish with bacterial strains of EHEC bacteria (enterohaemorrhagic Escherichia coli.) in the microbiological laboratory of the The Austrian Agency for Health and Food Safety (AGES) in Vienna June 9 , 2011. The German government has been criticised at home and around Europe for failing so far to pin down the cause of the E.coli outbreak that has killed 27 and stricken more than 2,700 people in 12 countries. All cases have been traced back to near Hamburg in northern Germany. REUTERS/Leonhard Foeger (AUSTRIA - Tags: SCI TECH HEALTH) 

An Austrian scientist prepares petri dishes with bacterial strains of EHEC bacteria (enterohaemorrhagic Escherichia coli.) in the microbiological laboratory of the The Austrian Agency for Health and Food Safety (AGES) in Vienna June 9 , 2011. The German government has been criticised at home and around Europe for failing so far to pin down the cause of the E.coli outbreak that has killed 27 and stricken more than 2,700 people in 12 countries. All cases have been traced back to near Hamburg in northern Germany. REUTERS/Leonhard Foeger (AUSTRIA - Tags: SCI TECH HEALTH) 

An Austrian scientist holds a petri dish with bacterial strains of EHEC bacteria (enterohaemorrhagic Escherichia coli.) in the microbiological laboratory of the The Austrian Agency for Health and Food Safety (AGES) in Vienna June 9 , 2011. The German government has been criticised at home and around Europe for failing so far to pin down the cause of the E.coli outbreak that has killed 27 and stricken more than 2,700 people in 12 countries. All cases have been traced back to near Hamburg in northern Germany. REUTERS/Leonhard Foeger (AUSTRIA - Tags: SCI TECH HEALTH IMAGES OF THE DAY) 

An Austrian scientist holds a petri dish with bacterial strains of EHEC bacteria (enterohaemorrhagic Escherichia coli.) in the microbiological laboratory of the The Austrian Agency for Health and Food Safety (AGES) in Vienna June 9 , 2011. The German government has been criticised at home and around Europe for failing so far to pin down the cause of the E.coli outbreak that has killed 27 and stricken more than 2,700 people in 12 countries. All cases have been traced back to near Hamburg in northern Germany. REUTERS/Leonhard Foeger (AUSTRIA - Tags: SCI TECH HEALTH) 

An Austrian scientist holds petri dishes with bacterial strains of EHEC bacteria (enterohaemorrhagic Escherichia coli.) in the microbiological laboratory of the The Austrian Agency for Health and Food Safety (AGES) in Vienna June 9 , 2011. The German government has been criticised at home and around Europe for failing so far to pin down the cause of the E.coli outbreak that has killed 27 and stricken more than 2,700 people in 12 countries. All cases have been traced back to near Hamburg in northern Germany. REUTERS/Leonhard Foeger (AUSTRIA - Tags: HEALTH SCI TECH) 

An employee holds petri dishes with bacterial strains of EHEC bacteria (bacterium Escherichia coli.) in the microbiological laboratory of the 'Universitaetsklinikum Hamburg-Eppendorf ' (University Clinic Eppendorf- UKE) in the northern German town of Hamburg, June 2, 2011. REUTERS/Fabian Bimmer (GERMANY - Tags: HEALTH SCI TECH) 

A laboratory worker looks for strains of E.coli bacteria in vegetable cells placed in a petri dish, in La Mojonera near Almeria in southeastern Spain June 2, 2011. A deadly outbreak of E.coli centred in Germany and spreading across Europe is caused by a dangerous new strain, Chinese scientists who analyzed the bacteria said. The scientists said the outbreak, which has killed 17 and made more than 1,500 others ill in at least 10 European countries and is thought to come from vegetables, carried genes making it resistant to several classes of antibiotics. REUTERS/Francisco Bonilla (SPAIN - Tags: HEALTH BUSINESS AGRICULTURE SCI TECH) 

A laboratory worker looks for strains of E.coli bacteria in vegetable cells placed in a petri dish, in La Mojonera near Almeria in southeastern Spain June 2, 2011. A deadly outbreak of E.coli centred in Germany and spreading across Europe is caused by a dangerous new strain, Chinese scientists who analyzed the bacteria said. The scientists said the outbreak, which has killed 17 and made more than 1,500 others ill in at least 10 European countries and is thought to come from vegetables, carried genes making it resistant to several classes of antibiotics. REUTERS/Francisco Bonilla (SPAIN - Tags: HEALTH BUSINESS AGRICULTURE SCI TECH) 

An employee displays EHEC bacteria (bacterium Escherichia coli.) strain in a petri dish containing agar jelly for bacterial culture in the microbiological laboratory of the 'Universitaetsklinikum Hamburg-Eppendorf ' (University Cllinic Eppendorf- UKE) in the northern German town of Hamburg May 24, 2011. REUTERS/Morris Mac Matzen (GERMANY - Tags: SCI TECH HEALTH) 

An employee displays EHEC bacteria (bacterium Escherichia coli.) strain in a petri dish containing agar jelly for bacterial culture in the microbiological laboratory of the 'Universitaetsklinikum Hamburg-Eppendorf ' (University Cllinic Eppendorf- UKE) in the northern German town of Hamburg May 24, 2011. REUTERS/Morris Mac Matzen (GERMANY - Tags: SCI TECH HEALTH) 

An employee displays EHEC bacteria (bacterium Escherichia coli.) strain in a petri dish containing agar jelly for bacterial culture in the microbiological laboratory of the 'Universitaetsklinikum Hamburg-Eppendorf ' (University Cllinic Eppendorf- UKE) in the northern German town of Hamburg May 24, 2011. REUTERS/Morris Mac Matzen (GERMANY - Tags: SCI TECH HEALTH) 

An employee displays EHEC bacteria (bacterium Escherichia coli.) strain in a petri dish containing agar jelly for bacterial culture in the microbiological laboratory of the 'Universitaetsklinikum Hamburg-Eppendorf ' (University Cllinic Eppendorf- UKE) in the northern German town of Hamburg May 24, 2011. REUTERS/Morris Mac Matzen (GERMANY - Tags: SCI TECH HEALTH) 

An employee displays EHEC bacteria (bacterium Escherichia coli.) strain in a petri dish containing agar jelly for bacterial culture in the microbiological laboratory of the 'Universitaetsklinikum Hamburg-Eppendorf ' (University Cllinic Eppendorf- UKE) in the northern German town of Hamburg May 24, 2011. REUTERS/Morris Mac Matzen (GERMANY - Tags: SCI TECH HEALTH)