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Further Observations on the Duration of Immunity to the Homologous Strain of Plasmodium Vivax¹

In a previous paper (1) it was shown that an effective homologous immunity to the McCoy strain of Plasmodium vivax may endure for more than three years. In 1938, the availability of the same test patient, together with another patient whose primary attack was practically contemporaneous, provided an opportunity for repeating the observation after an interval of approximately seven years since the primary attack.

The previous inoculation experiences of these patients may be summarized as follows:

(a) Patient 14. This patient was originally included in our second series of inoculations. On August 12, 1931, he was inoculated by three demonstrably infected mosquitoes (lot 38), containing the McCoy strain of P. vivax. Thirteen days later parasites were first detected in his blood smears, and over a period of 42 days he experienced a primary attack lasting 19 days and a recurrence lasting 15 days, both of which terminated spontaneously.

Received November 24, 1938.
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 coöperation with the Florida State Board of Health and the Florida State Hospital.