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Table 1 Formula to calculate the time to quantify soil-transmitted helminth and Schistosoma mansoni eggs in stool based

From: Comparison of individual and pooled stool samples for the assessment of intensity of Schistosoma mansoni and soil-transmitted helminth infections using the Kato-Katz technique

 

Individual samples (n = 360)

Pooled samples

Pool size of 5 (n = 72)

Pool size of 10 (n = 36)

Pool size of 20 (n = 18)

Pooling stool samples

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72 x mean time to make one pool of 5

72 x mean time to make one pool of 5 + 36 x mean time to make one pool of 10

72 x mean time to make one pool of 5 + 36 x mean time to make one pool of 10 + 18 x mean time to make one pool of 20

Preparing of KK smears

+36 x mean time to prepare 10 KK thick smears

+ 7.2. x mean time to prepare 10 KK thick smears

+ 3.6 x mean time to prepare 10 KK thick smears

+ 1.8 x mean time to prepare 10 KK thick smears

Examining of KK smears

+ Total time required to examine 360 KK thick smears of 360 individual stool samples

+ Total time required to examine 72 KK thick smears of 72 pools of 5

+ Total time required to examine 36 KK thick smears of 36 pools of 10

+ Total time required to examine 18 KK thick smears of 18 pools

  1. KK Kato-Katz