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a cold is technically an upper respiratory infection... (according to the MAYO clinic)... I would give them all a good supplement ...

http://www.afn.org/~poultry/flkman3.htm (INFECTIOUS BRONCHITIS AND ITS EFFECT ON EGG PRODUCTION AND EGG QUALITY) ...here is a helpful "poster" of Poultry Disease and anatomy (click on the magnifier to enlarge the section you wish to read)... also handy to print out...

I would imagine they have all been exposed and with the swollen eyes and such, I believe it is too far along to be helped in any way with ACV... I would suggest you put a call into your vet for the appropriate med and treat your entire flock.