Gametocytemia in Plasmodium vivax and Plasmodium falciparum infections.
Two expert research microscopists, each blinded to the other's reports, diagnosed single-species malaria infections in 2,141 adults presenting at outpatient malaria clinics in Tak Province, Thailand, and Iquitos, Peru, in May-August 1998, May-July 1999, and May-June 2001. Plasmodium vivax patients with gametocytemia had higher fever and higher parasitemia than those without gametocytemia; temperature correlated with parasitemia in the patients with gametocytemia. Plasmodium falciparum patients with gametocytemia had lower fever than those without gametocytemia, but similar parasitemia; temperature correlated with parasitemia in the patients without gametocytemia. Hematologic data in Thailand in 2001 showed lower platelet counts in P. vivax patients with gametocytemia than in the P. vivax patients without gametocytemia, whereas P. falciparum patients with gametocytemia had similar platelet counts but lower red blood cell counts, hemoglobin levels, hematocrit levels, and higher lymphocyte counts than patients without gametocytemia.
Mckenzie
F Ellis
FE
Fogarty International Center, National Institutes of Health, Bethesda, Maryland 20892, USA. em225k@nih.gov
Wongsrichanalai
Chansuda
C
Magill
Alan J
AJ
Forney
J Russ
JR
Permpanich
Barnyen
B
Lucas
Carmen
C
Erhart
Laura M
LM
O'Meara
Wendy P
WP
Smith
David L
DL
Sirichaisinthop
Jeeraphat
J
Gasser
Robert A
RA
D000328:Adult; D000367:Age Factors; D000818:Animals; D003430:Cross-Sectional Studies; D019353:Endemic Diseases; D004906:Erythrocyte Count; D005260:Female; D005334:Fever; D006400:Hematocrit; D006454:Hemoglobins / Q000032:analysis; D006801:Humans; D007958:Leukocyte Count; D016778:Malaria, Falciparum / Q000453:epidemiology* / Q000469:parasitology; D016780:Malaria, Vivax / Q000453:epidemiology* / Q000469:parasitology; D008297:Male; D018512:Parasitemia / Q000453:epidemiology* / Q000469:parasitology; D010568:Peru / Q000453:epidemiology; D013785:Thailand / Q000453:epidemiology
D006454:Hemoglobins