Help identifying disease wiping out new chickens

Orange Chicken 22

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About two months ago, I got about a dozen new chickens, a mix of australorp pullets and Red sexlink hens( actual ages unknown). Within the first two weeks, three australorp pullets had died. Two looked like they had just died in the middle of the night while sleeping on their roosting bars and fallen on the ground. The third had looked lethargic the day before, and had died by the next morning.

In the past two weeks, I have had two more australorp pullets and a red sexlink hen die. Again, one pullet died in the middle of the night, for seemingly no reason. The other pullet was a little lethargic, and was laying on the floor of the coop the next day, alive but doing very poorly. I had tried to get some food and water in her, but she was too weak to take it. I left her under a heat lamp so she would be at least be a little more comfortable and she died later on that day. The red sexlink was fine yesterday, but this morning I found her laying on her side in the coop, with her head tightly curled forward. After I picked her up, she started shaking her head back and forth. I also put her under the heat lamp and she died within an hour.

I hadn't noticed any other symptoms in these birds. I went back and re-examined the sexlink, and she seemed perfectly normal. Normal comb and eyes, no sign of diarrhea or weird poop, normal skin and feathers, normal weight.

A few weeks ago I noticed two of my original hens sneezing, but they are fine now. Only chickens from that new group have died. My ducks are also unaffected.

The new group was not isolated from the rest of the flock, which I now regret. Only one of the hens from the original flock is vaccinated for Marek's that I am 100% sure of, the rest I don't know.

They are free range on an acre, and usually don't sleep in the actual coop unless it rains. They usually sleep out in a chicken wire covered run. They are fed 18% layer pellets. The weather in my area has been ranging from 40s and 50s during the day and 20s and 30s at night.

I need help identifying what this may be, and what, if anything, I can do about it. Please let me know if there is any additional information I can give to help narrow it down.
 
Sorry for your losses. Where are you located? Usually there are some signs of illness before a chicken dies. It sounds like there could be a problem with a possible toxin or moldy feed. Coccidiosis, crop disorders, or something else might be happening, but those usally cause symptoms. I would examine the feed now, smell it and look for a bad odor or green mold. The best way to know if you have a disease affecting your flock ia to save abondy, keep it cold, not frozen, and send or take it to your state vet for a necropsy. Here is a list of most state vet labs in the US:
https://www.metzerfarms.com/PoultryLabs.cfm
 
I'm in Alabama. I've checked the feed and it seems fine. I've had issues with coccidiosis in the past, but nobody seems to be having any symptoms of it right now. I've saved the body of the hen from this morning, and I'll try to get in contact with the lab and see if they'll take it.
 
Alright, I've got my hen set up to go to the lab tomorrow morning. I'll post an update when I get the results back.
 
The lab called and said that there was a good bit of mucus in the throat, and she must not have been eating for a while, since she had no muscle. They also found a couple parasite eggs, but that may or may not be significant. They can't narrow it down yet, but I should know more next week after they've run more tests. I'm going to try to band or somehow differentiate between every hen so I can watch and know exactly who is eating, and who is not.
 
Here's the latest update from the lab:

"Histopathology: Intestine: The tissues are markedly autolytic, precluding critical evaluation; however, large numbers of cross and longitudinal sections of cestodes are present in the lumen or attached to the mucosa. Trachea: Apart from autolysis, no significant histologic changes are observed. Heart, lung, kidney, liver, spleen, ventriculus, brain, sciatic nerve: No significant histologic abnormalities are observed
Histopathologic Diagnosis: Cestodiasis, intestine"

What I got from googling was that this means she had a lot of evidence of tapeworms.

I also got a positive on the Avibacterium Paragallinarum (Infectious Coryza) PCR test. Everything else so far, (Avian Influenza, Avian Paramyxovirus 1,Mycoplasma Gallisepticum, and Mycoplasma Synoviae) tested negative. The lab says cause of death is still TBD.

My other chickens are all still fine. They seem to be spending more time in their run now that I'm bedding it every other day with the hay that my goats waste. I've also kept food out for them 24/7 in the run as opposed to a once a day feeding. They still free range, but stay much closer now.

Deworming is definitely on the list. Any recommendations on what to use? And should I go ahead and deworm my ducks also?

As for the positive for infectious coryza, I'm still working on what that means for the flock and what I should do about it.
 
Tapeworm infections are caused by chickens eating insects that are infected with tapeworm eggs. Treatment is Equimax equine paste found in the equine section at a feed store.
Dosage is 0.15ml given orally to a 5 pound chicken. Repeat dosing in 10 days.
Look for tapeworm segments or strands in feces. Segments look like white rice. The strands are flat and segmented. You only have to treat the birds that show segments or strands in feces.
View attachment 2497794View attachment 2497798
 

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