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The kittens in this section have either been exposed to Feline Rhinotracheitis or caught it.    This is a common disease in cats/kittens and one that we vaccinate for.     In this case, I had given all of these kittens their first vaccination (and 2nd vaccination to a few) before they caught this upper respiratory infection.
I have graded it on a scale of 1 - 5 and expect that the "no symptoms" group of level 1 will not have reoccurances.    Most likely, neither will level 2.    The moderate level of 3 and the few more moderate/severe level of 4 are more at risk for future sneezing, watery eyes etc.     NONE of these kittens became a level 5 with the ulcerated cornea and no scaring of the eye has occured in any of them.    I beleive that this "light" infection was because of the first vaccination that was given.
If the kittens get "stressed", it can trigger a minor re-occurance.     It is possible to spread this to other cats (not dogs or humans) because the vaccination that we give annually is not 100% effective.
Please take a look at the video for more information from an actual Vet and Expert on this disease. 
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Dr. Mulligan on Feline Rhinotracheitis