Help.. Do I treat 9 wk old chicks for Cocci if they were treated at 3 days old?

[NotableNancy]

I have (7) 9 week old chicks and my Silkie has had several bloody droppings today and was sitting puffed up off and on throughout the day. She has an empty crop but did eat a bit of wet starter feed earlier this morning and a few weeds. I would assume cocci and treat with Corid but here is the problem...

When my chicks were only 3 days old I saw blood on on the paper towels lining the brooder so I immediately started them on Corid.
Hours later I saw that it was a chick that was bleeding and I had to put down and was not Cocci. I did complete the 5 full days of Corid even though they didn't have it because I assumed it was more harmful to stop it.
So could my chicks still have Cocci even though they had a full course of it at 3 days old?
I just started integrating them with my 15 month old hens so they have access to their run. Should I treat them all or could this be something completely different?
When I isolated her she wasn't just standing around puffed up, she was actively trying to get out of the crate and seemed pretty peppy but did have bloody poo in the crate about an hour after I put her in it.

Chicks did have medicated starter feed for about a month now they're on starter/grower Agway brand.

Any ideas???

 

[Eggcessive]

Yes treat them now for 5 days. Chicks are building up immunity to coccidia and are not immune fully until 11-20 weeks old. Some treat them with a preventative dose (a 1/3 dose) every 3 weeks until they are old enough to have immunity. Medicated feed doesn't always help them develop immunity. I would give them 2 tsp of liquid Corid (or 1.5 tsp of the powder) per gallon of water.

 

[NotableNancy]

Yes treat them now for 5 days. Chicks are building up immunity to coccidia and are not immune fully until 11-20 weeks old. Some treat them with a preventative dose (a 1/3 dose) every 3 weeks until they are old enough to have immunity. Medicated feed doesn't always help them develop immunity. I would give them 2 tsp of liquid Corid (or 1.5 tsp of the powder) per gallon of water.

Thank you for your quick response!! Since they're in the older hens run as well as they're own is it ok for the older ones to drink it as well?
I hate to stop the integration of the 2 groups since it didn't go so bad today but will do it if I have to.

Thanks!!

 

[Eggcessive]

It shouldn't hurt the older pullets, so treat them all if you need to. After Corid is finished, give everyone some vitamins and probiotics or yogurt to help replace the good bacteria in the gut. Something that can be done is to use portable fencing (plastic poultry netting) as a barrier to separate the groups during the day, but do what you need to do. I would rather treat both groups than not treat the youngsters.