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Infection and Immunity, January 2000, p. 391-393, Vol. 68, No. 1
Wellcome Trust Research
Laboratories1 and Department of
Obstetrics and Gynaecology,4 College of
Medicine, University of Malawi, Blantyre, Malawi; Liverpool
School of Tropical Medicine, University of Liverpool, Liverpool,
United Kingdom2; and The Walter and
Eliza Hall Institute of Medical Research, Melbourne,
Australia3
Received 5 August 1999/Returned for modification 20 September
1999/Accepted 18 October 1999
We examined the formation of Plasmodium falciparum
erythrocyte rosettes using parasite isolates from placental or
peripheral blood of pregnant Malawian women and from peripheral blood
of children. Five of 23 placental isolates, 23 of 38 maternal
peripheral isolates, and 136 of 139 child peripheral isolates formed
rosettes. Placental isolates formed fewer rosettes than maternal
isolates (range, 0 to 7.5% versus 0 to 33.5%; P = 0.002), and both formed fewer rosettes than isolates cultured from
children (range, 0 to 56%; P < 0.0001). Rosette
formation is common in infections of children but uncommon in pregnancy
and rarely detected in placental isolates.
0019-9567/0/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.
Plasmodium falciparum Rosette Formation
Is Uncommon in Isolates from Pregnant Women
*
Corresponding author. Mailing address: Wellcome Trust
Research Laboratories, Box 30096, Chichiri, Blantyre 3, Malawi. Phone: 265 676 444. Fax: 265 675 774. E-mail: srogerson{at}malawi.net.
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