U.S. Millions more doses of swine flu vaccine were recalled

Post date: Dec 24, 2009 10:16:7 PM

Dec-24-2009

4.7 million doses shipped

Routine tests found they weren't strong enough to meet minimum public health standards for protection against the virus.

About 4.7 million doses of the weak vaccine were sent nationwide in October and November and the vast majority already

have been given to people. California public health officials said today they weren't sure how many doses the state received.

MedImmune.

The vaccine was strong enough when it was distributed but had weakened over time and fallen below minimum potency levels

by this month, according to the manufacturer, MedImmune.