I don't know that it's always necessary to immerse oneself in the minutia of a particular claim to doubt it's validity.
The first problem with the fat-virus claim lies with thermodynamics. The only way in which it is physically possible to gain weight is to consume more calories than one expends. End of story.
Did YOU read the study? Chickens that were given the human virus gained approx. twice as much body fat as chickens that did not get the virus, for identical feeding and exercise regimes.
Then why is it that when people go on a diet, they eat chicken. And why does everything else always taste just like chicken? And why is it that when you are scared of something, say like--of getting fat, people call you chicken? And why is the term choking the chicken used....oh nevermind.
Why did the chicken cross the road? He was caught in the fat folds of yo mama.