Bottles of donated breast milk are pasteurised at the Guangzhou Women and Children's medical centre in the southern Chinese city of Guangzhou May 8, 2013. With China's first breast milk bank opening in June at the centre, about 80 moms have donated to premature babies and other needy infants since the trial period started in late March, local media reported. REUTERS/Tyrone Siu (CHINA - Tags: HEALTH SOCIETY)

Pasteurized eggs are seen on a conveyor to be boxed at the National Pasteurized Eggs plant in Lansing, Illinois August 24, 2010. REUTERS/Frank Polich (UNITED STATES - Tags: SOCIETY HEALTH BUSINESS)

Workers sort eggs after pasteurization at the National Pasteurized Eggs plant in Lansing, Illinois August 24, 2010. REUTERS/Frank Polich (UNITED STATES - Tags: SOCIETY HEALTH BUSINESS)

Junvenal Olivar stacks pasteurized eggs for boxing at the National Pasteurized Eggs plant in Lansing, Illinois August 24, 2010. REUTERS/Frank Polich (UNITED STATES - Tags: SOCIETY HEALTH)

A labourer works at the production line of a local dairy factory in Hefei, Anhui province September 23, 2008. REUTERS/Jianan Yu (CHINA)

A worker freezes cow moose milk used to treat patients in a sanatorium near Kostroma some 350 km (217.5 miles) north-east of Moscow September 4, 2007. The moose farm, founded in 1963 to study the behaviour of moose, is the only one of its kind in Russia and is well-known for having achieved a family-like relationship between the animals and the farmers. Picture taken September 4, 2007. REUTERS/Denis Sinyakov (RUSSIA)

A farm worker filters cow moose milk at a farm near Kostroma some 350 km (217.5 miles) north-east of Moscow September 4, 2007. The moose farm, founded in 1963 to study the behaviour of moose, is the only one of its kind in Russia and is well-known for having achieved a family-like relationship between the animals and the farmers. Picture taken September 4, 2007. REUTERS/Denis Sinyakov (RUSSIA)

An Etoile du Vercors cheese factory employee selects cheeses at the packaging line in Saint Just de Claix, south-eastern France, 24 August, 2000. French cheese makers fear that lawmakers, seeking to eradicate a germ called Listeria monocytogenes, will force them to use pasteurised milk instead of raw milk to make cheese.

JD/

An Etoile du Vercors cheese factory lab technician analyses cheese looking for listeria germ at Saint Just de Claix, south eastern France, 24 August, 2000. French cheese makers fear that lawmakers, seeking to eradicate the germ called Listeria monocytogenes, will force them to use pasteurised milk instead of raw milk ending traditions that date back centuries.

JD/

Etoile du Vercors cheese factory employees select cheeses at the packaging line in Saint Just de Claix, south-eastern France, 24 August, 2000. French cheese makers fear that lawmakers, seeking to eradicate a germ called Listeria monocytogenes, will force them to use pasteurised milk instead of raw milk ending traditions that date back centuries.

JD/

An Etoile du Vercors cheese factory employee places cheese palettes on a packaging line in Saint Just de Claix, south-eastern France, 24 August, 2000. French cheese makers fear that lawmakers, seeking to eradicate a germ called Listeria monocytogenes, will force them to use pasteurised milk instead of raw milk ending traditions that date back centuries.

JD/

Bernard Gaud owner of Etoile du Vercors cheese factory poses in Saint Just de Claix, south-eastern France, 24 August, 2000. Gaud and other French cheese makers fear that lawmakers, seeking to eradicate a germ called Listeria monocytogenes, will force them to use pasteurised milk instead of raw milk ending traditions that date back centuries.

JD/

Etoile du Vercors cheese factory employees salt and turn cheese in their palettes in Saint Just de Claix, south-eastern France, 24 August, 2000. French cheese makers fear that lawmakers, seeking to eradicate a germ called Listeria monocytogenes, will force them to use pasteurised milk instead of raw milk ending traditions that date back centuries.

Etoile du Vercors cheese factory employee places cheese palettes in Saint Just de Claix, south-eastern France, 24 August, 2000. French cheese makers fear that lawmakers, seeking to eradicate a germ called Listeria monocytogenes, will force them to use pasteurised milk instead of raw milk ending traditions that date back centuries.

Etoile du Vercors cheese factory employees turn cheese in their palettes in Saint Just de Claix, south-eastern France, 24 August, 2000. French cheese makers fear that lawmakers, seeking to eradicate a germ called Listeria monocytogenes, will force them to use pasteurised milk instead of raw milk ending traditions that date back centuries.

Etoile du Vercors cheese factory employees turn cheese palettes in Saint Just de Claix, south-eastern France, 24 August, 2000. French cheese makers fear that lawmakers, seeking to eradicate a germ called Listeria monocytogenes, will force them to use pasteurised milk instead of raw milk ending traditions that date back centuries.

Etoile du Vercors cheese factory employees turn cheese palettes in Saint Just de Claix, south-eastern France, 24 August, 2000. French cheese makers fear that lawmakers, seeking to eradicate a germ called Listeria monocytogenes, will force them to use pasteurised milk instead of raw milk ending traditions that date back centuries.

Raw milk buckets seen at the Etoile du Vercors cheese factory in Saint Just de Claix, south-eastern France, 24 August, 2000. Gaud and other French cheese makers fear that lawmakers, seeking to eradicate a germ called Listeria monocytogenes, will force them to use pasteurised milk instead of raw milk ending traditions that date back centuries.

Raw milk buckets seen at the Etoile du Vercors cheese factory in Saint Just de Claix, south-eastern France, 24 August, 2000. Gaud and other French cheese makers fear that lawmakers, seeking to eradicate a germ called Listeria monocytogenes, will force them to use pasteurised milk instead of raw milk ending traditions that date back centuries.

Bernard Gaud owner of Etoile du Vercors cheese factory poses in Saint Just de Claix, south-eastern France, 24 August, 2000. Gaud and other French cheese makers fear that lawmakers, seeking to eradicate a germ called Listeria monocytogenes, will force them to use pasteurised milk instead of raw milk ending traditions that date back centuries.

An Etoile du Vercors cheese factory employee places cheese palettes on a packaging line in Saint Just de Claix, south-eastern France, 24 August, 2000. French cheese makers fear that lawmakers, seeking to eradicate a germ called Listeria monocytogenes, will force them to use pasteurised milk instead of raw milk ending traditions that date back centuries.

Etoile du Vercors cheese factory employees select cheeses at the packaging line in Saint Just de Claix, south-eastern France, 24 August, 2000. French cheese makers fear that lawmakers, seeking to eradicate a germ called Listeria monocytogenes, will force them to use pasteurised milk instead of raw milk ending traditions that date back centuries.

An Etoile du Vercors cheese factory lab technician analyses cheese looking for listeria germ at Saint Just de Claix, south eastern France, 24 August, 2000. French cheese makers fear that lawmakers, seeking to eradicate the germ called Listeria monocytogenes, will force them to use pasteurised milk instead of raw milk ending traditions that date back centuries.

An Etoile du Vercors cheese factory employee selects cheeses at the packaging line in Saint Just de Claix, south-eastern France, 24 August, 2000. French cheese makers fear that lawmakers, seeking to eradicate a germ called Listeria monocytogenes, will force them to use pasteurised milk instead of raw milk to make cheese.