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Am. J. Trop. Med. Hyg., 20(1), 1971, pp. 10-13
Copyright © 1971 by The American Society of Tropical Medicine and Hygiene

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Agreement between Microscopical Diagnosis and Indirect Fluorescent-Antibody Tests in Plasmodium Vivax and Plasmodium Falciparum Infections*

Neva N. Gleason{dagger}, Marianna Wilson{dagger}, A. J. Sulzer{dagger} AND Karel Runcik{ddagger}
U. S. Department of Health, Education, and Welfare, Public Health Service, Health Services and Mental Health Administration, National Communicable Disease Center, Parasitology Section, Atlanta,Georgia 30333

Results of tests by the indirect fluorescent-antibody (IFA) technique of serum samples were compared with results from microscopical diagnosis of blood films from two groups of patients with malaria: 159 persons infected with Plasmodium vivax (120 cases) or Plasmodium falciparum (39 cases); and from 79 servicemen who had attacks of vivax or falciparum malaria after returning from Vietnam. In the 159 persons, the parasite species was correctly identified by the IFA test in 76.7%. fourfold or greater differences in titer being used as a basis for speciation, as compared to identification of species by blood film examination. In the second group, the same criteria were used and correct identification was obtained in 81% of the cases from 0 to 14 days after the onset of symptoms, and in 96.2% from 15 to 60 days after the onset of symptoms. The IFA test was unreliable for speciation in tests of serum samples taken 6 months after the onset of symptoms.

Accepted for publication June 3, 1970.


* This study was supported in part by the U. S. State Department, Agency for International Development, Participating Agency Service Agreement (PASA) No. RA (HA) 5–68.


{dagger} Parasitology Section, Microbiology Branch, Laboratory Division, National Communicable Disease Center, Atlanta, Georgia 30333.


{ddagger} Preventive Medicine Division, Womack Army Hospital, Fort Bragg, North Carolina 28307. Present address: Army Environmental Hygiene Agency, Edgewood Arsenal, Edgewood, Maryland 21010.






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Copyright © 1971 by the American Society of Tropical Medicine and Hygiene.