Pandemic Phase
Definition
Novel Virus Alert
1.
•
novel virus detected in one or more humans
•
little or no immunity in the general population
•
potential, but not inevitable precursor to a pandemic
Pandemic Alert
1.
•
Novel virus demonstrates sustained person-to-person
transmission and causes multiple cases in the same
geographic area
Pandemic
Imminent
1.
•
Novel virus causing unusually high rates of morbidity and/or
mortality in multiple, widespread geographic areas
Pandemic
1.
•
Further spread with involvement of multiple continents; formal
declaration made
"Second Wave"
1.
•
Recrudescence of epidemic activity within several months
following the initial wave of infection
Pandemic over
1.
•
Cessation of successive pandemic "waves", accompanied by
the return (in the U.S.) of the more typical wintertime
"epidemic" cycle
1.