A pool of uncommon but replicating minor variants could provide the virus with many paths of escape from a particular immune response; the most common escape paths are likely to be relatively fit and to reflect a balance between replicative fitness and immune susceptibility.
France, by contrast, is looking relatively fit.
It was true: although the festival participants were relatively fit, the locals were relatively not fit.
Knowing you're relatively fit and healthy helps.
Students who were overweight but relatively fit had higher test scores than lighter, less-fit children.
Running has now become a habit and at last I am relatively fit.
Now spring forth my soon-to-be fellow relatively fit people and be proud of those six-minute kilometres.
The man's 73-year-old father died of organ failure, even though he had been relatively fit and healthy.
Other people have argued that the ad will backfire and elicit sympathy for Christie among the multitudes of overweight voters even in the relatively fit state of New Jersey.
Now, for the first time, the effect has been measured on a star (it has been measured on the Sun, of course, but since the Sun rotates relatively slowly it is relatively fit, with a diameter at the equator that is just 0.001 percent bigger than the diameter at the poles).
