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CORRIGENDA Volume 42, No. 4 CERCARIAL TRANSMISSION SEASONS OF SCHISTOSOMA MANSOArl IN THE NILE DELTA AREA Page 577, Table 3, third column, heading Delete: No. of snails shedding cercariae in the first 24 hours Insert: No. of counts of cercariae shed in the first 24 hours Volume 42, No. 4 EVALUATION OF LEPROSY CONTROL PROGRAMMES: SOME SUGGESTIONS FOR OPERATIONAL AND EPIDEMIOLOGICAL ASSESSMENTS Page 633, footnote 5 Second sentence: Delete: and 5 years for lepromatous and borderline cases Insert: and 10 years for lepromatous and borderline cases