Yes, TYPHOID is a Scrabble word!

Letter values in Scrabble US: T 1, Y 4, P 3, H 4, O 1, I 1, D 2.

Is it a valid word?

TYPHOID is a valid word in the official Scrabble dictionary (US), the UK Scrabble Dictionary and Words with Friends (ENABLE).

serious infection marked by intestinal inflammation and ulceration; caused by Salmonella typhosa ingested with food or water

Also: typhoid fever, enteric fever.