Can a snake get sick from...

[Warocker's Wife]

So I don’t know if your snake can get sick but I would assume it.
I would never feed an sick feeder to a snake.

MADCOW disease hello..

I would ask for your money back and get a feeder somewhere else.

[LadyOhh]

You can transmit parasites (roundworm, hookworm) to your snake if the rat is a carrier.

That is why you need to make sure your feeders are of a high quality.

You never know what a sick rodent can be carrying.

[bsash]

I have always bred my own feeders, so I know they are healthy, and parasite free. I am talking about the ones that get a respiratory infection or just get old, I have fed off with no issues. In my opinion, you should try and take the feeder back, most places will not give you your money back, but it is worth a try.

[Elise.m]

I would take it back, and ask for store credit or money back. If they don't give you that, then I would leave the feeder with them and not go back.

[Jeremy78]

I would take it back and be taking my business somewhere else. A store who sells a visibly sick rat to someone wouldn't be getting my business.
I believe that just because they are a feeder they don't deserve a crappy life. That's why I raise my own feeders, fat and healthy :-). And happy :-P