“Viral” (** out of four) was a not-bad horror thriller about the outbreak of a virus that leads to the quarantine of a small Midwestern town, and how one teenager in particular (Sofia Black-D’Elia) tries to protect her sister (Analeigh Tipton) who has already been infected. Good-looking and well acted but unfortunately covers too much familiar ground, in the vein of “28 Days Later” and “Outbreak”. Michael Kelly is solid as usual as the girl’s protective dad.