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Okay, are the remaining chicks eating and drinking normally? Check their crops to see if they feel fairly full. How about the poo, what does it look like and are they actually pooing? If you observe them for several minutes you should see them poo at some point.
With every type of illness I've treated in my chickens, my first line of attack is to give supportive care: keep them warm and get food and water in them. Often I've noticed that just feeding them by hand while their own immune system takes care of whatever is wrong works wonders.
I keep an emergency kit on hand which includes the Kaytee Exact Hand Feeding Formula for all baby birds, lots of needle-less syringes of various sizes, and a bottle of the iron-free Poly Visol.
You can find the Kaytee at any pet store in the parrot section and it is great because it's a powder that you just add warm water to and you can mix it to whatever consistency you need. The Poly Visol is a liquid vitamin found in the (human) children's vitamin section at any store that carries vitamins. Make sure to get the one with no iron.
I usually start with mixing the Kaytee fairly thin to make it easy to syringe. Hold the chick gently and squirt the food into its mouth a little at a time. You don't want to drown them so take it slow and watch to make sure they are swallowing. Sometimes you can squirt just a little into the side of the beak and they will take it from there. I do the same thing with the water, just squirt it into the side of the beak and let them do the swallowing so you don't squirt it in the lungs.
I feed until I can feel the crop bulge a bit and then give them a drop or two of the poly visol. Repeat this at least 2 to 3 times a day. Check the crop to see when it is empty and watch for them to start eating and drinking on their own.
Some other useful things to keep on hand for the future are regular syringes with small gauge needles, Tylan 50 (feed store), antibiotic ointment with NO pain killer (poison to birds), preparation H (also with no pain killer, this is to treat prolapse), poultry drench, apple cider vinegar, Cocci meds, and standard first aid supplies like swabs, cotten balls and gauze.
I hope your remaining chicks make it through, and that this bad experience doesn't put you off the idea of keeping chickens. It is always sad when you lose some, but the joy that comes from the ones that stick around is well worth the pain.
Edited to add: Not sure why the site is substituting the word 'hen' wherever I used the singular version of the word chicks but it won't let me fix it so...whatever. Apparently we can say chicks but we can't say chick (watch, it is going to censor the word I really used here...weird).