Sick 6 day old chick- Help!

[Bzrzad3]

Alright so we recently had a batch of 20 new Hampshire red chicks hatch, but suddenly we found and isolated one who was
- "gasping"
- sneezing occasionally
- lethargic in general
It's day two of this sick baby being sick, but she is floppier and tends to sleep. I have her set under a heat lamp on the table- but she's barely moving. Just breathing. Has she got mareks and I accidentally spread it to other babies? Is this a simple common sickness?

 

[Bzrzad3]

At this point we did euthanasia on her- she had slipped tendon and wasn't eating well. However it'd be great to know what happened!

 

[True Patriot]

Sorry to hear. I don't know enough about respiratory problems to be of more help.

 

[ChickNanny13]