Volume 9, Issue 6
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



Three experiments were performed in which large numbers of dissected, uninfected salivary glands of mosquitoes were injected intravenously into normal rhesus monkeys. No artefacts resembling exoerythrocytic parasites of were seen when liver taken at biopsy 8 days later was examined.

The same three monkeys were subsequently injected with smaller numbers of glands infected with sporozoites. Liver biopsy revealed many schizonts 8 days later.

When monkeys were injected intravenously with infected glands, exoerythrocytic parasites were invariably seen, even when as few as eight pairs of glands were used. Exoerythrocytic parasites have been seen in 24 different monkeys.

Exoerythrocytic parasites are described from 5 to 120 days after inoculation of the monkeys. The findings in all essential details confirm those of Shortt and Garnham and their associates. Small differences between typical and subspecies are described.

Two plates, made from color photomicrographs, depicting the cycle in the monkey are presented.


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