President Barack Obama said the swine flu vaccine is voluntary but the government will "strongly recommend" that citizens get it.
"I don't want anybody to be alarmed, but I do want everyone to be prepared," Obama said.
Obama spoke after he was briefed on the nation's preparation for swine flu by officials that included Health and Human Service Secretary Kathleen Sebelius and Homeland Security Janet Napolitano.
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A vaccine is currently being developed and will likely be available by October. A new report from the White House showed that as many as half the U.S. population could be infected.
Get more: AP