Another scientific search engine for your arsenal.
Scirus claims to be "the most comprehensive scientific research tool on the web. With over 450 million scientific items indexed at last count, it allows researchers to search for not only journal content but also scientists' homepages, courseware, pre-print server material, patents and institutional repository and website information."
This general search for "tropical medicine" right now finds 677,271 sources. So they may be right...
[Found in this article, which lists over a hundred different niche searche engines covering a range of topics.]
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