Loss of sensitivity of immunochromatographic test (ICT) for lymphatic filariasis diagnosis in low prevalence settings: consequence in the monitoring and evaluation procedures.

Indeed, a positive trend was found between microfilarial density (measure by blood smears) and circulating filarial antigen (CFA), measured either by ICT or ELISA, as well as with the number of adult worms assessed by ultrasound [ 13 , 14 ].

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