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The Specific Status of Plasmodium Ovale Stephens¹

We should like to correct a rumour which seems to have got abroad to the effect that we have recently changed our opinion regarding the specific status of Plasmodium ovale. We wish to say without qualification that no change of that kind has occurred and that for the reasons given in our paper published in Parasitology (vol. xxv, March, 1933), there still remains no doubt in our minds that P. ovale must be regarded as a separate species. The reasons may be summarized as follows:

1. The morphology of P. ovale in the human host is specifically different from that of any of the three malaria parasites previously recognized, and these specific morphological differences are not lost or modified when the parasite is passed from person to person by direct blood inoculation.

Received December 20, 1934.
¹ This communication was received in the form of a letter to the Editor but, owing to its importance it has been thought best to print it as a separate paper in the JOURNAL.—Editor.