Does my cat's distemper shot prevent all upper respiratory infections?

The distemper vaccine is against feline rhinotrachetis and calicivirus (feline herpes virus type I) which are responsible for 80-90% of infectious feline upper respiratory tract diseases. But that means there are still 10-20% of upper respiratory infections that can be caused by other things such as bacteria and viruses. It may be Alani has a respiratory infection from one of those. I would have her seen by a vet. The vet can confirm if she has a respiratory infection, and can prescribe medication to help her. I can give you some things to try at home as well, but they should not take the place of seeing the vet. First, you can try starting her on an L-lysine supplement - this is an amino acid that has been shown to help the immune system fight off respiratory infections more effectively. Enisyl and Viralys are both good brands, and can be purchased over the counter without a prescription - just follow the dosing instructions on the label based on your cat's weight. If she's congested, you can also try using a humidifier or bringing her into the bathroom with the door closed while you take a hot shower - the steam and humidity help to break up congestion and temporarily relieve symptoms associated with respiratory infections. I hope this helps!