Can humans catch scours

Humans can get diarrhea, yes. Scours is just another Word for diarrhea, and most certainly they can get it from calves, from vectors like E. coli 0157:H7, salmonella, campybacter spp. and CryptosporidiOSis parvum, all bacteria that can transmit from young calves to humans if good hygiene (i.e., washing hands, cleaning boots and clothing, etc.) is not followed.