Answer: pandemic

AnswerCrossword Clue
PANDEMIC

Large-scale outbreak

PANDEMIC

Universal

PANDEMIC

Prevalent all over

PANDEMIC
Considerable outbreak
PANDEMIC
Existing everywhere
PANDEMICPlague, e.g.
PANDEMICNightmare for the C.D.C.
PANDEMICVery widespread
PANDEMICWidespread epidemic
PANDEMIC"The Last Ship" event
PANDEMICGlobal scare