Some cats also display signs of reduced physical activity, irritation on or by the vaccine location, slight fever, swelling, diarrhea, throwing up, exhaustion and difficulty walking. Sure enough, Felocell 4 website says 1% of cats develop fever, lethargy, anorexia beginning 7-21 days AFTER vaccine was given, lasting an average of 12 days. It is not uncommon at all that kittens/cats are lethargic and lose their appetite after vaccinations. This is because the animal's immune system is fighting a low dose of the disease in the vaccine, which can upset the gastrointestinal tract. However, it is common for many pets to experience mild side effects following vaccination, similar to those that humans experience. Modern vaccines are extremely effective and safe. they took her to a veterinarian after seeing green mucus from her nose. I asked vet about vaccine reaction and he said "very unlikely that far out." Organ Damage: A protein in the rabies vaccine can sometimes damage a cat's liver, kidneys and nervous system. Sometimes a "full stomach" after vaccines, for the first twelve or so hours, keeps the cat acting "normal". My cat was the same. The distemper vaccine causes many animals to feel sick to their stomach. my parents have a cat. Mild vomiting due to nausea is not uncommon, but … Regular vet (Best Vet in The Universe) saw her Monday and her first thought was vaccine reaction. It is normal for a cat to be lethargic for up to seventy two hours, after vaccines. she was getting lethargic and not herself. This is similar to human babies who often are cranky, lethargic, and even feverish after vaccines. I have noticed, if you keep the cats stomach "full" after vaccines that seems to lessen the physical side effects. In the days immediately following your fluffball's vaccination, closely monitor her for any unusual health symptoms. Watch out for loss of motor skills, seizures and tissue damage at the vaccination site. The cause of your cat lethargy can be as simple and benign as plain old boredom, however, such listlessness could also signal disease, and it is in every cat owners interest to know the signs. A 1 year booster vaccination is required after primary vaccination, followed by a vaccination every three years.” If a kitten is in a high risk situation (e.g., feral kitten that is to be released following a TNR [trap, neuter, return] protocol, or is living outside for any other reason), they can … two days later she had some violent spasming while meowing very loudly. Typical vaccine reactions may range from immediately after vaccination to days, months, or even years later. the vet wouldn’t treat her without a rabies vaccine and determined she had a bad sinus infection. 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