The iTunes U app gives you access to complete courses from leading universities and other schools - plus the world’s largest digital catalog of free education content - right on your iPad, iPhone, or iPod touch.
Video tutorial e previews of the app:
[video:http://vimeo.com/33626913]
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The vaccine against seasonal influenza is called trivalent, because it contains viruses representing three influenza strains: one A/H1N1, one A/H3N2, and one B. the single B-lineage antigen included is the one that is predicted to circulate in the related season. However, this means that some mismatch between the B antigen in the vaccine and the B antigen actually circulating may occur, this being a problem since cross-protection by immunization against the other lineage is expected to be low.
