epidemic
ɛpɪˈdɛmɪk
noun
a widespread occurrence of an infectious disease in a community at a particular time.
a flu epidemic
outbreak,plague,scourge,infestation,widespread illness/disease,pandemic,epizootic,recrudescence,boutade
adjective
of the nature of an epidemic.
epidemic diseases
rife,rampant,widespread,wide-ranging,extensive,sweeping,penetrating,pervading,global,universal,inescapable,ubiquitous,prevalent,predominant,endemic,pandemic,epizootic