Don Ryan/The Associated Press archive Medimmune makes the only nasal spray version of the swine flu vaccine. Sorayo Martinez, 4, was photographed getting vaccinated in October in Oregon City, Ore.

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.

Dec. 22 (Bloomberg) -- AstraZeneca Plc’s MedImmune unit announced a recall of 4.7 million doses of its nasal spray version of the swine flu vaccine because tests showed a decline in potency, U.S. regulators said.

Drugmaker Medimmune is recalling nearly 5 million doses of swine flu vaccine because the nasal spray appears to lose strength over time.

TUESDAY, Dec. 22 (HealthDay News) -- The good news on the H1N1 swine flu front is that the number of cases of infection continues to decrease and the vaccine supply is now plentiful.

At least 60 million people in the United States have been vaccinated against swine flu, and children are twice as likely as adults to have been inoculated, a top health official said Tuesday.

Dec. 22 (Bloomberg) -- At least 60 million Americans have received the swine flu vaccine out of 111 million doses available as of this week, the U.S. Centers for Disease Control and Prevention reported today.

Long-term asthmatic Alex Salmond receives the swine flu jab at a GP surgery, it is confirmed by the SNP.

Americans who were worried about the safety of the swine flu vaccine are still worried and it may not be easy to convince them to get themselves or their children vaccinated, researchers said on Tuesday.

Experts say a dog in suburban New York is the nation's first confirmed to be carrying the same strain of swine flu that is infecting humans.