There are three core cat vaccinations that every single cat should get. We call the core vaccinations the F3. They cover feline herpes virus, feline calicivirus, and a condition called feline panleukopaenia. If you tested every cat to see if they had been exposed to these viruses, it would be around 85 to 90 per cent have seen them at some point in their life. But there’s a catch with vaccinations—not all cats can get them, and they have to be tailored to every individual cat.