You do not understand about coccidiosis. You DO NOT need to kill chicks!!!! Cocci is a parasitic infection of the intestinal tract. It is the leading cause of death among chicks,but is easily controlled using a coccidiostat. Cocci is spread by droppings,which get into feed/water via droppings(cocci thrives in brooder setups)but it is also spread by wild birds/bringing new birds into flock,your own hands/clothes/shoes/feed utensils,etc. Most birds have some cocci in their small intestines,ONLY becomes a problem if they have an overload/outbreak,then we use a coccidiostat to bring it under control. It is a parasitic infection NOT a contagious a disease.
Symptoms of coccidiosis are: runny/watery poop(may or may not contain blood,depends on which strain it is)fluffed feathers,lethargic,not eating/drinking properly. The key to preventing deaths is to administer a coccidiostat(all chicken keepers should keep a coccidiostat on hand) immediately,even if you only suspect cocci,treating with a coccidiostat will not harm chicks,but not treating will result in deaths. Birds are only immune to the strains they have had prior exposure to.
Purchase Corid(amprolium) or might be called Amprol(amprolium)depends where you live(Amprolium is the medication,but the brand names differ from country to country). Amprolium is a thiamine blocker,parasite needs thiamine to survive/reproduce,stop reproduction and parasite comes under control. Dose for Corid/Amprol 9.6% liquid is 2 tsp per gallon of water,dose for Corid 20% powder is 1-1.5 tsp per gallon of water. Treat ALL chickens for 5 days,make sure medicated water is their ONLY source of drinking water. DO NOT give vitamins during treatment as they interfere with the ability of coccidiostat to work,give vitamins after treatment is complete.
For cleaning use diluted cleaning ammonia as bleach is not effective in killing parasite.
BOTTOM LINE, NO NEED TO KILL CHICKS and it is not necessary to burn anything!
NOTE: Coccidiosis is species specific,meaning that the cocci your chicks had is not the same cocci your dog/pups had. Pups are frequently infected with coccidia from the feces of their mother and are most likely to develop coccidiosis b/c of undeveloped immune system. Dog kennels/pounds/breeders etc do have outbreaks of coccidiosis,this is common.