The integrated transmission assessment survey (iTAS), a modification of the transmission assessment survey for LF, offers an opportunity to co-evaluate transmission levels of both diseases in areas receiving MDA for LF and onchocerciasis. It provides a standardized platform for the joint assessment of LF and onchocerciasis to effectively coordinate treatment cessation decisions in known or suspected co-endemic areas and thereby maximize resources. The iTAS can be used to map onchocerciasis transmission in areas of unknown or hypo-endemicity, or to assess the status of transmission in onchocerciasis meso- and hyper-endemic areas after several rounds of MDA.
The iTAS was developed by WHO with guidance from technical experts, informed by research and the implementation experiences of country programs. (WHO, 2025)
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