Weird sci-fi like scene from a show or movie I can’t seem to place.

Ok so I watched this scene on TV though I’m not sure if it’s a show or movie. It kinda had a Twilight Zone feel though. In the scene a man dressed like an astronaut is exploring a house where everyone is dead. I think he cuts the arm of a body and instead of blood, sand comes out. The only living person is a baby in a crib and he makes an assumption that the sickness only affects people who have eaten in the past 24 hours. It is in English and the video looked 70’s-80’s ish

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