The United States recently recorded its largest number of malaria cases in 40 years.
In 2011 the Centers for Disease Control and Prevention (CDC) received reports of 1925 malaria cases, the most since 3180 cases were reported in 1971 and a 14% increase over the 1691 cases reported in 2010. Nearly all of the 2011 cases were in US residents who had traveled to countries with ongoing malaria transmission.
Of 1655 cases in which the region where the illness was acquired had been determined, 69% were contracted in Africa, 22% in Asia, and 8% in the Americas. About half of the US malaria cases reported in 2011 were in 7 areas of the country: New York City, California, Maryland, Florida, Texas, New Jersey, and Georgia. Massachusetts reported the greatest change in cases—a 133% increase from 36 in 2010 to 84 in 2011.