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The amount of influenza-specific antibodies present in an individual’s blood can indicate not only if they experienced the flu, but potentially when - a finding that could improve disease monitoring in the tropics, where flu season is unending. In the largest study of its kind, an international team, led by researchers from the Oxford University Clinical Research Unit in Ho Chi Minh City, Vietnam, the Erasmus Medical Centre in Rotterdam, Netherlands, and Penn State University, identified antibody concentrations that correspond to recent and past exposure to the flu strain H1N1 - the strain involved in the 2009 flu pandemic.

Microscope image of influenza virus