To manufacture the vaccine for a flu from pigs, humans need lots of eggs from chickens.

The biggest obstacle is the egg-based technology used to develop all flu vaccines in the United States.

The process involves first growing the virus in chicken eggs, then harvesting it into vaccines.

Not only is this a time-consuming process, but Goldhammer points out that the quantity of the vaccine produced is limited to the egg's volume.

"It's only so fast that you can make a chicken lay eggs," said Goldhammer.