In the past, CDC received reports of approximately one human swine influenza virus infection every one to two years in the U.S., but from December 2005 through February 2009, 12 cases of human infection with swine influenza have been reported.
Reference: Facts come from the cdc.gov website on virus h1n1flu (swine flu)
We should be thankful that the swine flu did not spread very rapidly. it is not very deadly like Ebola but swine flu can still kill you.