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Er, actually some of us don't know what could happen, LOL. Would you mind explaining to the clueless one? Thanks!
There are many different types of worms that chickens can get. Certain types of wormers kill or paralyze certain types of worms. If a broad spectrum wormer is used for the first time on chickens that have never been wormed, it's possible that the overload of dead worms in the chickens system could cause toxicity and possibly kill the chicken. For the very first time worming, I always recommend using wazine first to expel large roundworms, then follow up 10-14 days later with a broad spectrum wormer such as valbazen, safeguard or ivermectin, to kill the roundworm larva and other worms. Then the next time when worming, I recommend using valbazen first, then 10-14 days later use safeguard or ivermectin as the second wormer.