Yes, VACCINIAS is a Scrabble word!

Letter values in Scrabble US: V 4, A 1, C 3, C 3, I 1, N 1, I 1, A 1, S 1.

Is it a valid word?

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

a local infection induced in humans by inoculation with the virus causing cowpox in order to confer resistance to smallpox; normally lasts three weeks and leaves a pitted scar
a viral disease of cattle causing a mild skin disease affecting the udder; formerly used to inoculate humans against smallpox

Also: variola vaccine, variola vaccinia, variola vaccina.