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Infect. Immun., 06 1995, 2323-2326, Vol 63, No. 6
A Rowe, J Obeiro, CI Newbold and K Marsh
Rosette formation in 154 fresh Plasmodium falciparum isolates from Kenyan
children with mild (n = 54), moderate (n = 64), or severe (n = 36) malaria
was studied to determine whether the ability to form rosettes in vitro is
correlated with malaria severity. There was a wide distribution of rosette
frequencies within each clinical category; however, a clear trend towards
higher rosette frequency with increasing severity of disease was seen, with
the median rosette frequency of the mild-malaria group (1%; range, 0 to
82%) being significantly lower than those of the moderate-malaria group
(5%; range, 0 to 45%; Mann-Whitney U test, P < 0.02) and the
severe-malaria group (7%; range, 0 to 97%; Mann-Whitney U test, P <
0.003). Within the severe-malaria category there was no difference in
rosetting among isolates from cerebral malaria patients or those with other
forms of severe malaria. We also examined the ABO blood groups of the
patients from whom isolates were obtained and found that isolates from
group O patients (median rosette frequency, 2%; range 0 to 45%) rosetted
less well than those from group A (median, 7%; range 0 to 82%; Mann-Whitney
U test, P < 0.01) or group AB (median, 11%; range 0 to 94%; Mann-Whitney
U test, P < 0.03). We therefore confirm that rosetting is associated
with severe malaria and provide further evidence that rosetting is
influenced by ABO blood group type. Whether rosetting itself plays a direct
role in the pathogenesis of severe malaria or is a marker for some other
causal factor remains unknown.
Copyright © 1995, American Society for Microbiology
Plasmodium falciparum rosetting is associated with malaria severity in Kenya
Institute of Molecular Medicine, John Radcliffe Hospital, Oxford, United Kingdom.
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