A medical professional leads a volunteer to receive an experimental flu shot at the University of Maryland in Baltimore
A medical professional leads a volunteer to receive an experimental vaccine designed to prevent him from contracting the H1N1 swine flu virus, during early trials of the drug at the University of Maryland in Baltimore, August 10, 2009. The University of Maryland's School of Medicine is one of the eight university medical centres and clinics trialling the experimental vaccine, expected to become more widely available later in the year, designed to protect against the H1N1 influenza virus. REUTERS/Jason Reed (UNITED STATES HEALTH)
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