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Journal of Clinical Microbiology, 02 1997, 450-454, Vol 35, No. 2
CM Shih, LP Liu, WC Chung, SJ Ong and CC Wang
An asymptomatic Babesia infection was confirmed by laboratory diagnoses.
The intraerythrocytic protozoan (designed TW1) isolated from a 51-year-old
Taiwanese woman appeared to be morphologically consistent with small-form
piroplasm, and measurements indicated that it had a body size of 1.5 to 2.5
microm in diameter. The typical features of ring, binary, and tetrad forms
were observed in Giemsa-stained thin blood smears. A persistent and
low-grade parasitemia was established after hamster inoculation. Indirect
immunofluorescent-antibody reactivities indicate that this strain (TW1) of
Babesia was serologically related to, but not identical to, the Babesia
species (B. microti) that infects rodents. Antibody titers in the patient's
sera combined with the clinical symptoms suggested that the present case
was a chronic and subclinical babesial infection. A neighborhood human
serologic survey indicated that the infection may have been acquired
accidentally from an infected rodent and localized within the same family.
Indeed, rodents from areas around the neighborhood were trapped, and a high
prevalence (83%) of babesial infection was observed. The possible vector
responsible for the transmission remains to be identified.
Copyright © 1997 by the American Society for Microbiology. All rights reserved.
Human babesiosis in Taiwan: asymptomatic infection with a Babesia microti-like organism in a Taiwanese woman
Department of Parasitology and Tropical Medicine, National Defense Medical Center, Taipei Medical College, Taiwan, Republic of China.
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