A pandemic event is the widespread incidence of a disease that is present through an entire region, continent, or even worldwide. A pandemic flu happens when a new variety of virus invades a community that does not have any resistance to that particular flu strain. Four major pandemics have swept around the globe since 1890.
The first recorded pandemic flu history happened 1890 and was most intense in the United States and Western Europe.
The Spanish Flu circled the w...
