The Centers for Disease Control and Prevention (CDC) says 1,925 malaria cases were reported in the United States in 2011. This number is the highest since 1971 and represents a 14% increase since 2010.
CDC says 'Almost all of the malaria cases reported in the U.S. were acquired overseas. More than two-thirds (69%) of the cases were imported from Africa and for the first time, India was the country from which the most cases were imported. Cases showed seasonal peaks in January and August.'
More at: Malaria Nexus and CDC