Adult Mansonella perstans in the Abdominal Cavity in Nine Africans

J. Kevin Baird
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Ronald C. Neafie
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Leo LanoieDivision of Geographic Pathology, Department of Infectious and Parasitic Disease Pathology, Armed Forces Institute of Pathology, Washington, DC 20306-6000

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Daniel H. Connor
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Adult Mansonella perstans infected the abdominal cavity of nine patients seen at Karawa Hospital in the Ubangi territory of Zaire. In four patients the worms were removed at laparotomy, and in the other five they were removed at autopsy. Twelve adult worms were identified in the nine patients. None of the worms caused symptoms or contributed to the patient's death. Worms were in the hernial sac in three patients, and one each was in connective tissue beside a reactive mesenteric lymph node, in peripancreatic connective tissue, in perirenal connective tissue, in hepatic portal connective tissue, on the serosal surface of the small intestine, and in connective tissue adjacent to rectum. The diameter of male worms was 45 µm to 60 µm and of female worms, 80 µm to 125 µm. One female worm was removed intact. It was 6 cm long and had a bifurcated tail characteristic of M. perstans.

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