Inside 4 month old female. Started with high fever Lil to no food, water. Lethargic. Took to vet. Negative on hiv and leukemia, dewormed.no apparent signs of a reason. Did adopt 2 other young kittens from shelter about a week before. They were fixed and had shots and healthy. Anyway no apparent reason for fever so vet have a shot and i am giving amoxicillon orally twice a day. Encouraging water and cat formula several times a day. She will take a bite or 2 of food but not much. My question is i think i should see improvement by now. If i took her Monday and it's now thursday. She still is weak and sleeping day and night and feels like she still running fevers... Any ideas on what is going on