Thank you very much!
I ended up keeping Napoleon in the hospital cage from the Tuesday when he was bitten, to Sunday. I was uneasy about returning him to the cage with the others, but over the course of the week, I noticed he just wasn't eating as much as he used to. Throughout all of this, the most hopeful thing was that he kept eating so well, and it made me nervous that he was now eating less. So Sunday I decided to put him back in the cage with the others. So far, there haven't been any major problems, and I'm keeping a very close watch on them.
Napoleon's appointment at the vet this week also went well. The vet said he didn't hear the raspiness in Napoleon's breathing that he used to hear, though he said Napoleon was breathing faster than usual. The vet thought that might be stress. Napoleon was again 32 grams, so he didn't gain weight, but he also didn't lose weight either. The vet also said he checked Napoleon's ability to grip with his feet. Previously Napoleon had a very weak grip, but during this last visit the vet said Napoleon was gripping better. Napoleon is still having difficulty balancing, but the vet says the neurological symptoms accompanying infections could take some time, possibly weeks, to completely disappear.
The vet had two recommendations: a third doxy injection to make sure we get rid of the bacteria and a beak trim. The vet had previously agreed that Napoleon's beak was too long, but hadn't wanted to stress Napoleon while he was sick. Since Napoleon was now doing better, the vet believed the beak trim could help at this point. Next week I'm due to call the vet with an update to see if a fourth injection is necessary.
Everything going forward is dependant on how Napoleon's condition progresses. For now, I'm seeing a lot of positive signs. While wobbly, he doesn't lose his balance as much as before. He can do a lot more that he couldn't before. I see him frequently scratching his head with his leg, which before used to either be a struggle or just impossible for him. Preening is less difficult for him as well, and he's able to open up his tail and preen his feathers, where before he would lose his balance if he tried. When he walks on the bottom of the cage, he's again not losing his balance as much as he used to. And periodically throughout the day he'll chirp, not as loud as before he was sick, but he is chirping more often where before he wasn't. Progress is slow but noticeable.
I'm wondering how much I should push for a fourth doxy injection. I read that in cases of psittacosis doxy is given for 45 days, which would be more than the four weeks the vet has mentioned. Then again, we don't know if Napoleon has psittacosis or something else. We do know that he is clearly responding to the doxy.