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Blood, 15 November 2000, Vol. 96, No. 10, pp. 3333-3333
FEATURED MICROGRAPH

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Congenital relapsing fever (Borrelia hermsii).
William A. Dittman Sr, Sacred Heart Medical Center, Spokane, WA. A
35-week infant was delivered by cesarean section because of fetal
distress. Her mother presented to Sacred Heart Medical Center early
because of decreased fetal movement. At delivery, the child
demonstrated respiratory depression requiring intubation and manual
resuscitation. Apgar scores were 1 at one minute and 5 at five minutes.
The "admitting" diagnosis was sepsis with shock. Cord blood counts
revealed a white blood cell count at 8.2/µL, hemoglobin level at
16.4g/dL, hematocrit level at 48.8%, and platelet count at 8/µL.
Nucleated red blood cells were 88 per 100 white blood cells. During
verification of the platelet count with the blood film, multiple
spirochetes were seen (A), many in clumps (B). These spirochetes were
further classified and confirmed by immunofluorescent antibody staining
as Borrelia hermsii. No organisms were seen on
multiple blood films of the mother. Although the placenta was grossly
and microscopically normal, silver stains demonstrated spirochetes.
A review of the prenatal history identified an episode of fever,
chills, aching, headache, and fatigue which occurred at week 16 of the
pregnancy. The mother recalled a similar one-day illness at week 19. There were no other untoward events until presentation. The child
was treated with fluids for the septic shock. Ampicillin and cefotaxime
were given initially, and erythromycin was added when the spirochetes
were found. Dexamethasone was administered for the septic shock and
thrombocytopenia. Improvement was progressive until day 9 when
hypotension, pallor, and abdominal distension occurred. Autopsy
revealed bleeding into a liver abscess with subsequent rupture of a
subcapsular hematoma. No organisms were found in the abscesses at
autopsy. Relapsing fever (tick-borne borrelia hermsii)
is endemic to the western United States. It is transmitted by the
Ornithodoros hermsii tick.
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