Malaria : etiology, pathology, diagnosis, prophylaxis, and treatment / by Graham E. Henson.

  • Henson, Graham E. (Graham Edward), 1874-
Date:
1913
Catalogue details

Licence: In copyright

Credit: Malaria : etiology, pathology, diagnosis, prophylaxis, and treatment / by Graham E. Henson. Source: Wellcome Collection.

    47/204 (page 39)
    Tertian Estivo-Autumnal Malaria (Plasmodium Falciparum, Figs. 9-11).—This is the most common of the estivo-autumnal infections, and has been more often reported than the quotidian type. The cycle is completed in forty-eight hours, or sometimes a little less, and attended with exacerbations of symptoms every third day. Double invasion of a cell and even multiple infections are a common occurrence in this type, of the disease. (Fig. 9.) The parasite as first seen is a hyaline ring (Fig. 10), usually round but occasionally taking on oval shapes, and while it is somewhat hard to differentiate from the very early forms of the quartan parasite, a close and careful observation will bring out certain differential Fig. 9.—Plasmodium falciparum (Ter- tian estivo-autumnal plasmodium). Multiple invasion with the estivo- autumnal parasite. Fig. 10.—Plasmodium falciparum (Ter- tian estivo-autumnal plasmodium). Young ring forms. (After Craig.) points in its morphology. It is considerably smaller than either of the parasites previously described, and as the schizont de- velops the difference in morphology allows of no mistake. The infected cell appears smaller arid is of a green color. In the young forms of the parasite the protoplasmic ring is broader at one point of its periphery than the remainder, giving to it a characteristic “signet-ring” appearance; it is a very refractive or- ganism and possesses but slight ameboid motion. Pigment is formed while the parasite is in the ring form, usually appearing, in the broad part of the protoplasmic ring, at about the end of eighteen hours; the granules are of a reddish color and are motile but not so actively as in the benign tertian parasite. The organ-