He is no more a human petri dish that any other kid in his school.
Less so than any of the recent arrivals from third world countries who are welcomed with open arms at the same school, and certainly less so that the two kids at the same school who actually DO have CF.
The sweat test is a routine screen for children whose parents are both known have the CF gene. He passed.
When you read the article, did you happen to see the part where it mentions that "1 in 25 people are carriers".
For those of you in Rio Linda that means that the odds are pretty darned good that in any random classroom of 30 or so students there is already a kid with one CF gene.
Yet he's too "dirty" to go to this school? Why?
And why is he clean enough to go to another school 3 miles away?
What's so "special" about the two siblings at Jordan school that ACTUALLY HAVE CF and by your reasoning are little, filthy, living, breathing, coughing petri dishes full of "everything from staph to strep, and it doesn’t stop with bacteria. Fungal infections also plague" that they get to stay, while the healthy kid has to go infect some other school?
(So I deliberately edited your words to imply you said that CF sufferers could have plague. Sue me.)
It does not say in the article that the boy has only one defective copy of the CFTR gene.
It also does not say that he can never get CF, only that he does not have it now.
So it is unclear from the article whether he has one good copy of the CFTR gene, or if he is some sort of unusual case who has not come down with the disease despite having two defective copies.