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© 1977 Oxford University Press

other

On Allowing for Diagnostic Imperfections in Assessing Effective of Treatment for Schistosomiasis

M J GODDARD1

1 London School of Hygiene and Tropical Medicine London WC1, England

Some possible effects of misdiagnosis for Schistosomlasis in epidemiological measurements are investigated. With greater chances of misdiagnosis for lower prevalence levels, expectations of control programmes might be reassessed. As prevalence decreases, the fraction of missed positives over all apparent negatives need not uniformly decrease. In control situations even perfect treatment rates may produce very small changes in prevalence and other indices of infectivity level.

Revised 8 July 1977


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