Chapter IV: Part I: Tropical Diseases and Their Treatment

DESCRIPTION OF PLATE OF MALARIAL PARASITES

Benign Tertian Parasites

A1. _Schizonts._ 1. Normal red cell. 2. Young ring form. 3.
Amoeboid or figure-of-eight form showing Schüffner’s dots. 4.
Amoeboid form showing increased chromatin (twenty-four to thirty
hours). 5. Segmentation of nucleus. 6. Nuclear halves further
apart, red cells enlarged and pale. 7. Further division of nucleus.
8. Unusual division form. 9. Typical merocyte. 10. Rupture of
merocyte liberating merozoites.

A2. _Female gametes._ 1. Young form showing solid instead of
ring-form staining. 2. Half grown form. 3. Rapidly growing form
with compact nucleus and clear vacuolated zone. 4. Full grown
macrogamete showing eccentrically placed chromatin and much
pigment in deep blue stained protoplasm. _Male gametes._ 1. Young
form similar to female one. 2. Half grown form showing central
chromatin. 3. Full grown microgametocyte showing large amount of
centrally placed chromatin with light blue protoplasm surrounding.
4. Division of chromatin occurring in microgametocyte and
developing in wet preparation. NOTE.—Chromatin division in gametes
does not take place until blood is withdrawn. 5. Spermatozoon like
microgametes developing from the microgametocyte. This only occurs
in wet preparations or in the stomach of the mosquito.

Quartan Parasites

B1. _Schizonts._ 1. Normal red cell. 2. Young ring form. 3. Older
ring form. 4. Narrow equatorial band. 5. Typical band-form. 6. Oval
form showing division of chromatin. 7. Early stage merocyte. 8.
Daisy form merocyte.

B2. _Male gametes._ 1. Young solid form. 2, 3, 4. Developmental
stages microgametocytes. 5. Flagellated body in wet preparation
showing microgametes developing from microgametocyte. _Female
gametes._ 1. Young oval form. 2. Somewhat older stage. 3 and 4.
Mature macrogametocytes (same as benign tertian).

Malignant Tertian Parasites

C1. _Schizonts._ 1. Normal red cell. 2, 3, 4, 5, 6. Young ring
forms. These are hair-like rings and are the only forms besides
crescents to be found in the peripheral blood. _In very heavy
infections_ or in smears from spleen the following forms are found.
7. Beginning division of chromatin. 8 and 9. Further division. 10.
Merocyte.

C2. _Female gametes._ 1 and 2. Young macrogametes. 3. Older stage.
4. Development in red cell. 5 and 6. Fully developed female
crescents showing clumping of pigment and rich blue colour. _Male
gametes._ 1 and 2. Developing forms. 3 and 4. Fully developed
microgametocytes. 5. Flagellated body developed in wet preparation.