The story of Desiree Jennings, the young woman who developed a devastating neurological disorder just 10 days after taking a seasonal flu shot, is the number one video on YouTube, and is generating controversy about the safety of the vaccine.

Opinions of the viewers who commented on a video of Desiree's story on YouTube were mixed.

One commenter wrote, "Stop taking shots...you're wrecking your immune system and making the diseases stronger."

But flu shot supporters also weighed in. One supporter wrote, "While her story is very unfortunate, this should not make people afraid of vaccines."

Indeed, medical experts say Desiree's reaction to the flu shot is a one-in-a-million occurrence, and urge everyone to get vaccinated for the seasonal and the hard-to-get H1N1 vaccine.

Meanwhile, Desiree's courage continues to inspire people. INSIDE EDITION caught up with her as she competed in a five mile race in Reston, Virginia.

She experienced sheer joy during the run, moving comfortably and speaking normally. But the second she crossed the finish line, her spasms return. Despite the heartbreaking moment, Desiree's story has clearly captivated the nation.

Despite the severe side effect that afflicted Desiree, doctors say you should not be afraid of getting the flu shot.