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The North Korean strain of Plasmodium vivax was characterized by its extraordinarily prolonged incubation period in certain circumstances. It was clearly demonstrated by quantitative observations that the phenomenon may be elicited by the inoculation of small numbers of sporozoites. After the intradermal inoculation of 10 or 100 sporozoites, the incubation(More)
Relatively little is known outside the USSR about the past history of malaria in that country, the contribution of its scientists to malaria research, the recent progress of Soviet malariology, or the achievements of the Soviet Union in the eradication of malaria. These achievements are of particular interest because the general strategy of malaria(More)
Numerous strains of P. vivax, distinguishable chiefly by their biological characteristics, are known to exist. Two main varieties are recognized: the so-called temperate and tropical strains. The most extreme example of the former-designated by Nikolaev as P. vivax hibernans-constantly exhibited an extremely long incubation period. The strain is no longer(More)
Chloroquine and amodiaquine are demonstrably still the most reliable drugs for the treatment of malaria, except in the south east Asia area, and in parts of south and central America where an altered sensitivity of falciparum plasmodia has been confirmed. The present position of malaria prophylaxis is, unfortunately, anything but satisfactory. But there are(More)