It turns out that Amanda was right and that kitty had panleukopenia -which has a 60-90% mortality rate. It’s so aggressive that the vet had to shut down the examination room we were in for the rest of the day and any of the people who took care of kitty could not treat any other cats during their shift.
She slept for two days straight and by today, we were able to pick her up and bring her home. When they brought her out from the back, her head was shooting straight out of the box and she didn’t stop purring for the first hour.
We rode in the back of the car where she nibbled on Gus’ toes -who squealed and grabbed at his fur.
Happy reunions all round.