Malaria 3500 Returning Vietnam veterans 3000 -Foreign immigration from 2500 malaria-endemic countries in Southeast Asia 20 00 1000 500 0 19671972197719821987199219972002 Malarial areas in 1912 Year (a)Areas where malaria was endemic as recently as 1912. (b)Graph showing reported cases of malaria in the U.S.1967-2002 Figure 23.24Malaria Figure 23.24