Poultry is definitely a no-go, especially if it's a whole/uncleaned bird.
I'd personally be just fine with the beef. Do you have a sous-vide circulator? That's the easiest way to ensure it's safe for guests - you could let it sit in the sous-vide for a couple hours once it gets to 135 and then broil it to finish it off.
Otherwise, just check the temperature at multiple points prior to pulling it out.
I was curious about this - I sous-vide'd a prime rib last year and was wondering if it was actually *safer* doing it this way as far as temps are concerned. Given what you say, I think I may go ahead and sous-vide it tonight. I took it out yesterday and salt/pepper'ed it and it's currently sitting in the fridge. Is a couple hours really enough for a large prime rib like this to finish off? IIRC, it was an overnight ordeal when I last used the sous-vide for that other prime rib. This is a ~6lber btw
I should emphasize that I meant you should add an
additional couple hours once it reaches your temperature, but not so long that you're turning it into Texas brisket.
Controlling microbial growth has a temperature element, but to a lesser extent a time element. Once a cut of meat (or anything cooked, really) reaches a certain temperature, you've achieved an X-log reduction in the colonies of harmful microbes. But you can also further kill off any remaining stragglers by allowing additional time at a given temperature.
Normally, under typical cooking conditions you can't add too much extra time after your temperature is reached, because you're going to ruin the sensory aspects of the thing you're trying to eat. But sous-vide is different in that your water bath will never get hotter than the end temp, so the food more or less can't overcook. Obviously, just like with microbes, time will take its toll on the various structures and components of the food so
eventually you will ruin it but adding a few hours to something like a rib roast shouldn't do anything detrimental to how it tastes or feels.
I don't own a sous-vide circulator (but really should get one) so I can't say what amount of extra time will cause your meat to start to become unappealing.