Investigating the magnitude and drivers of...

In the News

Muhas don is new IHI board member

Prof. Kaaya. Ifakara Health Institute (IHI) Board of Governors (BOG) has appointed Prof. Sylvia Kaaya member of the IHI Board of Trustees (BOT) effective Wednesday January 10, 2018. The appointment …

Marcel steps down from IHI boards

Prof. Marcel Tanner has stepped down as Ifakara Health Institute (IHI) member of the Board of Trustees (BOT) and Board of Governors (BOG) effective Wednesday January 10, 2018. The Former …

Recent Projects

Understanding and enhancing approaches to quality improvement in small and medium sized private facilities in sub-Saharan Africa

This is an evaluation study that IHI is conducting in collaboration with London school of hygiene and tropical medicine. The research takes place in the context of an innovative intervention …

Vaccine Delivery Costing Study

As countries drive towards achieving high and equitable coverage of life-saving vaccines, the availability of sustainable, equitable, and predictable financing for vaccine delivery is essential. Over the last two decades, …

Investigating the magnitude and drivers of residual malaria transmission in Zanzibar

The global malaria burden has dramatically decreased in recent years, with at least four million fewer deaths today compared to 2001. WHO has estimated that between 2000 and 2015, the annual rate of new malaria cases dropped by 37% globally, and malaria death rates fell by 60% (WHO 2015). Current vector control practices, notably long-lasting insecticide treated nets (LLINs) and indoor residual spraying (IRS) have contributed approximately 78% of these gains (Bhatt et al 2015). In many settings, low-level residual transmission now persists even where LLIN and IRS coverage already exceeds 80%. The widespread lack of accurate data on extents and drivers of this residual transmission compound this problem. In Zanzibar, including Pemba and Unguja Islands, malaria prevalence rates are now so low (last estimates <1% in both Unguja and Pemba), that the country can feasibly aim for elimination. Field evidence suggests the few remaining cases are focalized and coincident with areas having high vector abundance, or where residents have recently travelled to mainland Tanzania. A comprehensive understanding of dynamics of residual transmission, and associated factors, would be immensely useful in guiding the end-game operations in Zanzibar. It is essential to exhaustively investigate the actual magnitude of the residual malaria transmission, and characterize it on the basis of where and when it occurs, as well as its main environmental and anthropological determinants. The main objective of this study is therefore to quantify and characterize existing residual Plasmodium transmission in communities where LLINs and IRS are already widely used, but where transmission still persists, in Zanzibar. In the short-term, we will deliver a set of profiles and quantification of residual malaria transmission and its associated determinants in selected sites in Zanzibar. This information will inform improved targeting of the remaining malaria

Lead Scientists:

Samson Kiware

Brian Tarimo

Kimberly Mihayo

April Monroe

Fredros Okumu


Johns Hopkins University



Projects Location

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