According to the literature the American negro possesses a marked tolerance, either natural or acquired, to the vivax malaria which he encounters in the United States.
A group of American white and negro troops, stationed in a highly malarious area of the Pacific, were studied to determine their comparative response to Pacific vivax malaria. There was no difference in the incidence of primary or recurrent malaria between the two races. Clinical and epidemiological observations likewise indicated a similar behavior in regard to this disease. Natives of this area in comparison with American negroes and whites manifested definite tolerance to the vivax malaria of their neighborhood.
It is concluded that:
a.The American negro lacks racial tolerance to the strain or strains of vivax malaria encountered in the Pacific.
b.The susceptibility of American negroes to Pacific vivax malaria does not differ from that of the American white.