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During the incubation period, at the time of the acute primary attack, or shortly after recovery from the acute attack, an absence of cross immunity between P. vivax and P. falciparum infections has been shown.
1 The studies and observations on which this paper is based were conducted with the support and under the auspices of the International Health Division of The Rockefeller Foundation, in cooperation with the Florida State Board of Health and the Florida State Hospital.
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