The figures I've heard for farm raised eggs is 1/30,000 are contaminated with salmonella. Salmonella is bad news in a factory farm situation; it causes some fairly serious health problems in the birds, and they test for it and generally have salmonella-free birds.
I'd be more worried about wild bird eggs, frankly, though not so worried that I wouldn't eat 'em raw. I eat raw eggs without concern -- quail egg with hot sauce is nummy! Just make sure the eggs are intact, and the shells not cracked.
My NEIGHBOR eats dud eggs from the incubator (kept at 98.5 for several days, until it's clear they're duds), though I've never been that brave. I was hatching chicks for him and he made me give him the duds back so he could have them for breakfast. I didn't ask him how he prepared them -- I didn't want to know. He's a bit of a farm boy.
The thing with eggs is that if they're bad, they go bad really really quickly at room temperature. You'd know. They stink. They stink so bad you can smell it through the shell, and if they've been bad for awhile, they explode like really memorable little stink bombs when you touch them.
(The neighbor's kids would bury eggs in the manure pile and dig them up days later to deliberately make stink bombs! Farm kids ... gotta love 'em.)
However, eggs are designed to survive weeks at 98.5-100 degrees (depending on species) under the mama bird. The same temps that let baby birds grow are perfect for growing bacteria. Any bacterial contamination at all will kill the baby chick. Bacterial contamination happens when there's a flaw in the egg shell, or the egg's been super-saturated in filth.
Though in a survival situation, the heroes will almost certainly find eggs that have varying degrees of "baby bird" in it, from a blood spot to a twitching bit of fetal tissue with a visible beating heart, to an actual fully formed chick. They're all edible (and the presence of a live chick in the egg pretty much guarantees little to no bacterial combination) but, umm, somewhat disconcerting and off-putting to civilized appetites.