There are many chances of Feline Leukemia as well. Keep it indoor. Feed it raw or fresh food because raw or fresh diets are more digestible nutrition than processed commercial cat foods. Better nutrition improves immunity in pets. There can be feline upper respiratory disease as well which be cured by few measures. Keep its eyes and nasal passages clear by removal of discharge. Increase humidity. Increase its water intake. Keep the cat warm and give it antibiototics. This disease does not need hospitalization unless disease gets worst.