With the virulent form of bird flu being reported in China now (see http://www.cfr.org/diseases-infectious/lethal-bird-flu-returns-china/p38832?c...), it may be good to have a discussion on diagnostics options for influenza.
Here are a couple of recent, free reviews on the topic:
Current Approaches for Diagnosis of Influenza Virus Infections in Humans
Point-of-Care Testing for Influenza
I know we have virologists in our community and look forward to their insights, especially with diagnosis of the latest strain of bird flu in humans.