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Am. J. Trop. Med. Hyg., 63(3), 2000, pp. 209-213
Copyright © 2000 by The American Society of Tropical Medicine and Hygiene

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American Journal of Tropical Medicine and Hygiene, Vol 63, Issue 3, 209-213
Copyright © 2000 by American Society of Tropical Medicine and Hygiene

Research Articles


An outbreak of fulminant hepatitis delta in the Waorani, an indigenous people of the Amazon basin of Ecuador

SR Manock, PM Kelley, KC Hyams, R Douce, RD Smalligan, DM Watts, TW Sharp, JL Casey, JL Gerin, R Engle, A Alava-Alprecht, CM Martinez, NB Bravo, AG Guevara, KL Russell, W Mendoza, and C Vimos

An outbreak of delta hepatitis occurred during 1998 among the Waorani of the Amazon basin of Ecuador. Among 58 people identified with jaundice, 79% lived in four of 22 Waorani communities. Serum hepatitis B surface antigen (HBsAg) was found in the sera of 54% of the jaundiced persons, and 14% of asymptomatic persons. Ninety-five percent of 105 asymptomatic Waorani had hepatitis B core (HBc) IgG antibody, versus 98% of 51 with jaundice. These data confirm that hepatitis B virus (HBV) infection is highly endemic among the Waorani. Sixteen of 23 (70%) HBsAg carriers identified at the onset of the epidemic had serologic markers for hepatitis D virus (HDV) infection. All 16 were jaundiced, where as only two of seven (29%) with negative HDV serology were jaundiced (P = .0006). The delta cases clustered in families, 69% were children and most involved superinfection of people chronically infected with HBV. The data suggest that HDV spread rapidly by a horizontal mode of transmission other than by the sexual route.


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