The first step uses a bit of influenza DNA to get the patient's immune system to begin fighting off the flu, and then the protection is given a "boost" some time later by the second step, which can be either another bit of DNA or a conventional flu vaccine.

VOA: standard.2010.07.21

And I had to step back and say, wait a second, things have happened in this nine-month period that were unimaginable for years and years and years.

WHITEHOUSE: Press Briefing by Press Secretary Jay Carney

In a sprint, every step and every second is significant.

FORBES: The Power Of Perspective In Your Business Success (Or Failure)

It looks like they've struck a sweet spot with performance and have taken a bit step forward as they usually do in the second half of the season.

BBC: David Coulthard column