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Seasonal incidence of tertian, subtertian and quartan infections



Seasonal incidence of tertian, subtertian and quartan infections



Indian Jour Med Res 20(1): 303-326



In Bengal 71% of the inhabitants were infected, as follows: P. vivax, 41.8%, P. falciparum, 50.3%, and P. malariae, 14.4%. 67% of P. vivax infections occurred in March-April and 29% in Sept.-Oct.; 25% of P. falciparum in the spring months, 72% Sept.-Oct.; 33% of P. malariae in June and 4% in Sept. Quartan infections occurred in June, sub-tertian in Sept. and tertian in March. 6.4% mixed infections were found. Gametocytes were lowest with P. falciparum and highest with P. malariae. Seasonal incidence was highest in P. vivax Sept.-Jan. and lowest in July; in P. falciparum maxima are present March-June and Sept.-Nov.; in P. malariae April-July and in Oct. P. vivax gave the most intense infection, P. malariae least. The ratio of gametocytes to parasites in P. malariae was 25.5%; the other spp. 13.5%. In P. vivax the intensity of infection was highest during the hot months, lowest in the winter with no positive correlation between intensity of infection and incidence of gametocytes. P. falciparum intensity was greatest Aug.-Oct. with a moderate correlation. In P. malariae the max. intensity occurred Sept.-Nov. with a fairly high correlation.

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