Only about 19% of the samples tested for swine-flu has returned positive. This is of course expected since the clinical markers for suspecting swine-flu is not very different from that of common flu. Since the diagnostic test facilities are not many and the test is quite expensive it may be worthwhile for the public health authorities to spend some money on research for better (preliminary) indication of swine flu. I anticipate it would not be hard to come up with a system based on bayesian methods that can give substantially better indication. This system can possibly be also deployed over the internet.
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