200 Million Eggs Recalled: How Does Salmonella Get into Eggs, Anyway?...
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One site I looked at said it can come from inside a laying hens ovaries, but also from dirty eggs. Most factory farm hens are in cages and I would assume a bit cleaner than a farmyard. I was at a clients house last week and they have 40 chickens but because they are free range, chicken shit everywhere. Did get a dozen free eggs though after reading some of the things on the internet, I will probably wipe the eggs down with a sanitized cloth.
Not a bad idea!