Yes, PARVO is a Scrabble word!

Letter values in Scrabble US: P 3, A 1, R 1, V 4, O 1.

Is it a valid word?

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

any of a group of viruses containing DNA in an icosahedral protein shell and causing disease in dogs and cattle; not known to be associated with any human disease