Plasmodium vivax

Infected erythrocyte beginning at stage B: often larger than normal, often with red Schüffner's dots

Rings 1/3 to 1/2 Large rings or 12-24 merozoites, Rounded, larger Rounded, nucleus

EDM, vacuole irregularly cleft form 1 to 2 pigment than EDM, nucleus larger than D, large, plasmic with diffuse pigment clumps, peripheral small and excentric, central or excentric, fringe narrow dispersal or central with diffuse pigment finer than pigment dispersal D and dispersed diffusely

Rings 1/3 to 1/2 Large rings or 12-24 merozoites, Rounded, larger Rounded, nucleus

EDM, vacuole irregularly cleft form 1 to 2 pigment than EDM, nucleus larger than D, large, plasmic with diffuse pigment clumps, peripheral small and excentric, central or excentric, fringe narrow dispersal or central with diffuse pigment finer than pigment dispersal D and dispersed diffusely

Fig. 9.18 EDM = erythrocyte diameter (according to Geigy R, Herbig A. Erreger und Überträger tropischer Krankheiten. Basel: Verlag für Recht und Gesellschaft; 1995).

the blood plasma when the erythrocyte is destroyed, they infect other erythrocytes and begin a new asexual cycle. After a short initial phase, the schi-zogonic cycles recur at regular intervals. A cycle takes 48 hours with P. vivax, P. ovale, and P. falciparum and 72 hours with P. malariae. Fever is induced when the schizonts burst and when many red blood cells are destroyed at once, causing the typical, intermittent fever attacks ("malarial paroxysm").

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