Hen a bit gurgly and sneezing

My Bluebell, Clara, was sounding a bit congested tonight when I went to shut them in. She is making little squeaky noises and is sneezing too. She is otherwise fine, eating and drinking as normal, perfectly active, lovely plump, red comb and wattles, no abnormal poos etc. I assume this could be a sign of a respiratory problem. Not much I can do tonight but I'll have to phone the vet in the morning and hope the 'chicken vet' Steve is in. If he isn't in the surgery tomorrow is there anything folks can suggest I can do to help her until Steve is there? Also, do I need to treat all three girls as a precaution? Clara is about two and a half years old now and the other two are only young, about 6 months.

As usual, Sod's Law prevails and 'chicken vet' Steve's day off is now on a Wednesday!! However, one of the other vets has agreed to have a look, so we're taking her later, armed with a list of possible ailments and appropriate treatments. Most likely is myco I think, although no watery eyes or yellow poo. She just gurgles instead of her usual happy chicken noises and sneezes every now and again. Otherwise she seems fine, bright eyed and tail up. We use Stalosan F in the run and coop to sanitise and it's anti-bacterial so should help reduce myco bacteria up to a point, but  they do free range in the garden when we're around, so they clearly aren't completely protected. I'll post the verdict later for info for folks who may have a similar issue in the future.

Actually he's right. I've always assumed that it is okay to eat eggs 28 days after the last treatment of Baytril and I know that I have read it on many forums, but I've just made a point of looking it up and even DEFRA records state that it should never be used in hens that are in the food chain. Everywhere I've looked it says the same, so where has the 28 day egg withdrawal come from - urban myth?
Fortunately, mine have only ever had Tylan which doesn't have the same drastic effect, but it's a frightening thought.

Vets can prescribe drugs not licensed for chooks but would need to justify why. Often it is because it is the best option for the bird. Not much money will be spent on drug research for chooks as commercially they are considered expendable! 

Good news