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Worms (roundworm larva) can cause a respiratory symptoms, but not sneezing. That's caused by an upper respiratory irritation and/or infection with some sort of organism (viral, bacterial, fungal - not known yet).
First things first - please tell us all the ages in which you're seeing symptoms. Tell us please what each age group is eating, and whether or not they're housed with another age group.
have you had any new birds come in within the last 30 days? A lot of rain?
Certain inadequate ventilation is a big deal with birds. Even with a clean coop. Especially in the summer, and particularly with humidity. since we're discussing this, what type of grounds and bedding and housing are you using?
First, rather than resorting to antibiotics yet (because we don't know the cause quite yet) I would start by boosting their immune systems.
Vitamin A is very important to respiratory health. Chickens of all ages can be given cod liver oil or fortified wheat germ oil sprayed on the feed twice weekly, three times weekly during illness. If you choose wheat germ oil, you can find it in the horse section of feedstores. Make sure to read the labels for "Fortified with A, D, and E". Use a hand-held sprayer and spray on top of the feed in the feeder.
Second, since there are sneezes, give all birds yogurt daily during illness and treatment for its live beneficial bacteria. The eyes and nares drain into the digestive tract, upsetting the healthy and essential live flora (bacteria) of the gut. If you use a cycline or mycin antibiotic (not recommended) then you'd have to stop yogurt or any milk products but instead you still have to give probiotics; in that case you will use Probios brand powder from the cattle section of the feedstore, or acidophilis capsules from the drug store. For now, yogurt is recommended to prevent secondary diarrhea.
Third, disinfect all waterers and feeders as the droplets are over them. Handle all sick flocks last, wearing a pair of coveralls or a man's shirt over your clothes for those sick birds. Use antibacterial gel as you leave the sick birds for the house to prevent putting their bacteria on the door knobs before you wash your hands. Make sure the entire family knows that the sick bird areas are off limits.
Fourth, smell your birds' heads daily. If the sinuses or faces get a certain smell (sour, or alternately fetid and nasty) update *this* thread and let us know - those can be pointers to specific disease. So can eye bubbles, cheesy nodules on the roof of the mouth, wry-neck. Every symptom you see, please report here.
Fifth, for the worst birds, I highly recommend using VetRx mixed in the same amount of water on q-tips and swabbing the nares, roof of the mouth, and under the eyes with it. That facilitates breathing, reduces sneezing (which can reduce infectious droplets), reduces irritation, reduces mucus, increase air (which bacteria hate - they hate oxygen), increases comfort. Buy the small 2 ounce bottle, any species (poultry, rabbits, cats, etc).
If you DO choose to use an antibiotic be sure you get a really good one. I'm a big fan of Tylan as it's not a 'mycin or 'cycline, it's very strong, it has few resistances, and can be either soluble (water dosed) or injected (3-day dosage - great stuff). I do NOT recommend an antibiotic yet. I do recommend the support treatments above in hopes that they themselves can overcome.
