A half dose may be enough

Nathan Compton, 5, grimaces as he gets an H1N1 vaccination from nurse Leslie Trotter, left, as his mother Madeline Rubenstein, right, comforts him at a H1N1-swine flu clinic in Sacramento, Calif., Monday, Nov. 16, 2009. Pharmaceutical maker Novartis AG said Tuesday a U.S. clinical study... Rich Pedroncelli, Associated Press
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