National Geographic : 2007 Jul
A GLOBAL BATTLE Pushed out of temperate zones like southern Europe half a cen tury ago by DDT spraying and draining of wetlands, malaria remains entrenched in the humid, lowland tropics of South America, Africa, and Asia. A less danger- ous strain-vivax-occurs mainly in South America and Asia. The deadliest form-falciparum sickens people in all three places. Sub-Saharan Africa suffers 90 percent of all malaria deat s. Malaria prevalence SMore than 50% of children infected S11-50% of children -------- - 10% or less of children - Plasmodium vivax only Extent in 1946 of all strains No malaria Omi 1,000 0 km 1,000 SOURCE: MALARIAATLASPROJECT NGMMAPS;REPORTEDBY HUGHK.TRUSLOW SOUTH AMERICA A volunteer health worker listens for signs of respiratory trouble in a man complaining of aches and a high fever near Iquitos, in Peru's Amazon. A blood test showed malaria. 44 NATIONAL GEOGRAPHIC JULY 2007 NORTH AMERICA UNITED STATES OF CANCER SOUTH SAMERICA PERU1 TROPICOF CAPRICORN ASIA Suspecting malaria, a technician, right, at a Kolkata clinic draws blood in the very room where a century earlier Sir Ronald Ross (portrait on wall) discov ered that mosquitoes spread the illness.