Does that have raw eggs in it? I wonder if those of us who just add water would be ok. It would also be nice to know the brand.

I would guess people buy powdered cake mix they add water to so I wouldn't think it would be a danger as the egg would be dried.

Eggs are very unlikely to be the source of E. coli. This sounds more like a storage or processing-led contamination.

Eggs can be a source of salmonella, but that's highly unlikely in a processed product as the eggs will have been pasteurised.

The E. coli risk involves raw flour (not heat-treated), which cake and similar mixes usually contain in abundance. It has nothing to do with eggs.

E. coli is also a risk that is always present with any untreated flour, not a specific outbreak issue. This and the salmonella risk from raw eggs are the two reasons why you are always told to not eat raw cookie dough. (But it's so good!)