Polio - Still Around

...World Health Organization announced Monday that spread of polio is an international public health emergency... could grow in the next few months and unravel the nearly three-decade effort to eradicate the crippling disease. ...described current polio outbreaks in Asia, Africa and the Middle East as an "extraordinary event...." first-ever international alert on polio. ...
[Extraordinary.... what could these areas have in common...?]