Volume 13, Issue 3
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



A repository preparation of the dihydrotriazine metabolite of chlorguanide (proguanil), known as CI-501 (Camolar®), was tested in 24 prisoner volunteers for its effectiveness as an antimalarial drug.

The 24 premedicated volunteers were challenged 1 to 10 times by the bites of mosquitoes heavily infected with the Chesson strain of vivax malaria. As of 24 November 1963, 12 of the 24 volunteers have developed patent infections 169 to 586 days after medication or 13 to 434 days after their last exposure to infection. The remaining 12 volunteers continue to show no evidence of infection 619 to 730 days (20 to 24 months) after medication.

These results indicate that this preparation has the capacity to exert long-term protection against vivax malaria. The importance of such a preparation in a program of world-wide malaria eradication is stressed.


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