AJTMH Transactions of the Royal Society of Tropical Medicine and Hygiene
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Am. J. Trop. Med. Hyg., 23(2), 1974, pp. 163-168
Copyright © 1974 by The American Society of Tropical Medicine and Hygiene

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Studies on Egg Excretion and Tissue Egg Burden in Urinary Schistosomiasis*

J. H. Smith{dagger}, Hazem Torky, Noshi Mansour AND Allen W. Cheever
Departments of Pathology and Parasitology, U.S. Naval Medical Research Unit No. 3, and the Department of Urology, Cairo University, Cairo, Egypt, U.A.R., and Department of Pathology, Peter Bent Brigham Hospital, Boston, Massachusetts 02115

Three 24-hour urinary egg excretion determinations were done on 25 patients with urinary schistosomiasis who were to undergo elective cystectomy. Tissue egg burdens were determined on the cystectomy specimens. There was no relationship between mean daily egg excretion and tissue egg burden in all cases. However, when cases were classed as "active," (histologic evidence of active oviposition) and inactive, the mean daily egg excretion (EE) was dependent upon tissue egg burden. This relationship may be expressed as: EE = a + k (the number of eggs/urinary bladder), where a (a constant) and k (the regression coefficient) vary with the activity of the disease. The effect of malignant tumors upon egg excretion appears to vary with the activity of the disease also. It is suggested that egg excretion as an estimator of tissue egg burden or intensity of infection should not be interpreted without consideration of the stage or activity of the disease. Moreover, further studies to more closely define the regressions of egg excretion upon egg burden in the various stages of urinary schistosomiasis may permit accurate estimation of egg burden (and consequently severity of disease) in individuals and communities.

Accepted for publication August 25, 1973.


* This work was partially supported by the U.S. Navy, Bureau of Medicine and Surgery Work Unit No. MR041.20.01-0328 and by Contract No. DA-49-193-MD-2253 of the U.S. Army Research and Development Command, Armed Forces Epidemiological Board.

Address reprint requests to: Medical Editor, NAMRU 3, FPO New York 09527.


{dagger} Present address: Hopital Mama Yemo, FOMECO, B.P. 169, Kinshasa, Republique du Zaire, Africa.






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Copyright © 1974 by the American Society of Tropical Medicine and Hygiene.