<div><p>CHICAGO (Reuters) - The U.S. Food and Drug Administration said on Tuesday AstraZeneca's MedImmune unit is voluntarily recalling some of its H1N1 swine flu vaccine because it was not as potent as it should be.</p><p>Norman Baylor, director of the office of vaccines research and review at ...

<div><p>A week after 800,000 doses of children's swine flu vaccine were recalled in the United States for losing their potency, a second vaccine maker recalled its A(H1N1) nasal spray for the same reason.</p><p>MedImmune announced late Tuesday that it was "voluntarily recalling unused doses of ...

<div><p>Drugmaker MedImmune is recalling nearly 5 million doses of swine flu vaccine because the nasal spray appears to lose strength over time, federal health officials announced Tuesday.</p><p>The vaccine recall is the second this month caused by declining potency and comes as public health officials urge millions of ...

<div><p>WASHINGTON (Reuters) - U.S. health officials are struggling to deliver vaccine against the H1N1 pandemic virus ahead of its spread but Sanofi Pasteur, one of five vaccine makers under contract, said on Friday it was on track.</p><p>A spokeswoman said the company could now deliver 75.3 million ...