viral infection

NOUN
15 LETTERS · STARTS WITH V

viral infection is a valid 15-letter word worth 22 points in Scrabble and 27 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS
V4I1R1A1L1I1N1F4E1C3T1I1O1N1
4 + 1 + 1 + 1 + 1 + 0 + 1 + 1 + 4 + 1 + 3 + 1 + 1 + 1 + 1 =22 PTS
DOUBLE WORD → 44TRIPLE WORD → 66
MEANING

What does viral infection mean?