Observations for

Recent 12 Months VCAP
Multi-year Comparisons

Vectorial Capacity

This map shows a Vectorial Capacity (VCAP) model that defines precipitation and temperature as the limiting factors of malaria incidence. VCAP is the daily rate at which future malaria inoculations could arise from a currently infected case.

It is used as a convenient way to express malaria transmission risk or receptivity of an area to malaria


Ceccato, P. , Vancutsem, C., Klaver, R., Rowland, J., Connor, S.J. A Vectorial Capacity Product to Monitor Changing Malaria Transmission Potential in Epidemic Regions of Africa. Journal of Tropical Medicine, Volume 2012, Article ID 595948, doi:10.1155/2012/595948.

Dataset Documentation

8 day average Vectorial Capacity
Data 8 Day Vectorial Capacity Model -- Malaria
Data Source USGS/Famine Early Warning System (FEWS)

Epidemiological Mask

This map utilizes an epidemiological mask to isolate areas prone to new exposure of malaria. The mask allows for VCAP to be exclusively illustrated in areas where malaria is considered to be epidemic, therefore, areas where malaria transmission is considered absent or endemic are excluded. The mask is based purely on climatic constraints to malaria transmission and does not yet account for areas in the northern and southern margins of the continent where control has eliminated malaria risk.

*More dekadal and daily data from FEWS is available from the FEWS NET Africa Data Portal.


Access the dataset used to create this map.


Contact help@iri.columbia.edu with any technical questions or problems with this Map Room.


The default map on this page displays the most recent 8 day average VCAP over Africa. As the user moves the cursor over the map, a tool bar will appear on top that will allow for previous 8 day estimate periods (2004-to the most recent) to be displayed.

The interface consists of a clickable map that allows users to generate customized time series graphs. When a desired location is clicked, two time series graphs are generated that provide a 12 Month VCAP time series and a Multi-year Comparison.

By placing recent VCAP in historical context, comparisons can be made to past outbreaks and useful early warning information can be developed for epidemic prone regions.