The resulting citation library was then reviewed and refined, retaining all references that met the following criteria for inclusion: (i) the reported study was undertaken after December 1984 (longitudinal surveys that began prior to but continued past this date were included); (ii) the surveys provided location information to a precision of administrative unit level one or higher; (iii) the surveys reported primary data; (iv) the surveys provided species-level information at the studied location; and (v) the surveys reported the presence of at least one DVS. Electronic mail alerts were then set up on various malaria information bulletins (Malaria in the News [37 ], Malaria World [36 ] and the Malaria Bulletin [38 ]) and by using "Anopheles" as a key word to generate article alerts via PubMed [31 ]. Content notifications for specific high yielding journals including Malaria Journal and Parasite and Vectors (via BioMed Central [39 ]), Vector-Borne and Zoonotic Diseases [40 ] and the Indian Journal of Medical Research [41 ] were also set up. Results from these searches were included until 31 October 2009.
Globally, the literature search resulted in 3857 publications or reports containing potential data to be reviewed. Of these publications, 2276 fulfilled the inclusion criteria, providing data for 147 countries worldwide. A total of 366 sources detailed surveys conducted across 25 countries in the Americas that are further summarized in the results. These data were then augmented with species records from the WRBU MosquitoMap [42 ].