it is always better to perfom the injection at the clinic to optimize the environment quality.
Once this said, we had several situations when cells had to be injected at the barn, since the horse could hardly move. And this went smoothly.
The attention paid by the vet to respect aseptic procedures is key.
We did not experienced any septic incident post injection, which also relates to the quality of the product we provide to the vet.
I hope this answer your question Duncan.
If this wasn't the case, please contact us directy.