The company says it is working to determine how the shell eggs are being contaminated.

CNN: STORY HIGHLIGHTS

Country Eggs, Inc. on Thursday said it is voluntary recalling specific Julian dates of shell eggs produced by Wright County Egg.

CNN: STORY HIGHLIGHTS

Krista Eberle, director of food safety programs at the Egg Safety Center, reiterated that only shell eggs are affected by the Wright County recall.

CNN: STORY HIGHLIGHTS

"From what we know they only do shell eggs, and if they did extra egg products, they are still considered to be safe, " Eberle said.

CNN: STORY HIGHLIGHTS

Only shell eggs are affected by the recall, the company said.

CNN: STORY HIGHLIGHTS

As a precautionary measure, Wright County Egg also has decided to divert its existing inventory of shell eggs from the recalled plants to a breaker, where they will be pasteurized to kill any salmonella bacteria present.

CNN: STORY HIGHLIGHTS

He sources the eggs through a registered farm or aviary (emus and their eggs are protected in the wild), then treats the eggs with a special resin to harden the shell.

BBC: The new 'Australian made'

Most helmets are a bit like eggs: good at withstanding compressive forces across the entire shell, but not so protective against localised impacts.

ECONOMIST: MONITOR