Health officials admitted, Wednesday, they may not be able to produce enough vaccines to keep pace with the spread of the H1N1 virus.

Centers for Disease Control and Prevention Director Thomas Frieden appeared on Capitol Hill to update House lawmakers on the availability of swine flu vaccines.

"We're very frustrated," he told the panel.

Only 32.3 million of the 159 million doses needed to cover all those at risk of getting the virus are available as of today, Frieden added.
    
High demand and problems growing the flu strain in labs have led to a shortfall.

Frieden said the department had been "burned" by making predictions and promises to get the vaccine out.
    
Meanwhile, California Democrat Rep. George Miller is working on a bill to guarantee five paid sick days to workers if their bosses tell them to stay home with symptoms of the swine flu.