Bama1,
Wazine is not meant to kill worms, just paralyzes them so they can be passed out of the body, where they die exposed to air. The reason most people will do Wazine as a first dose, is to keep the worms from dying all at one time, causing a protien overload, killing the chicken. Especially if it is the chickens first time to worm, and evidence of round worms have been passed in the stool. After that, you shouldn't need Wazine again, unless you fear there are still alot of worms. You can stay with Pandur, Fenbendazole/SafeGaurd or Valbazen.
Follow your vet's instruction since they have seen the size of the chick and worm/egg load, guessing it will be fine.
In the future, as a routine worming program to protect yours flocks from the ill's of the ground, in our area, you will want to start a worming protocol.
If you are interested, I can send you some info on Valbazen, at least for future reference. It will treat that plus everything else we have to address with our soil/weather/critters that they eat. The others mentioned above will not address every worm, but will need to be rotated with say, Valbazen, on occasion to avoid immunity/resistance.
I will be glad to pm it to you. It's listed on the AL site too. Think I sent it to Chicka a couple of weeks ago. Let me know if you need assistance, I'll be glad to help. So happy you were able to get a vet, so rare.....