Will my cat with calicivirus spread it to another cat after isolation?

I recommend getting a cat when you no longer live with your current roommate and her cat. As many of half of all cats with calicivirus infection may continue to shed calicivirus particles intermittently or constantly for several months or for a lifetime. As calicivirus is extremely contagious through either direct contact with an infected cat/cat shedding viral particles, breathing the same air as an infected/carrier state/shedding cat, or contact with contaminated objects such as food bowls and toys, it would definitely be best to wait and to be sure that your new cat/kitten receives all required boosters of the FVRCP vaccine as well as the rabies vaccine early on. Good luck!

Once a cat is exposed to calicivirus, it will go through an incubation period of 2-6 days before developing clinical signs which typically last for 14-21 days. During this entire time, the cat will potentially be infectious to other cats. At a minimum, infected cats will shed virus in their bodily secretions for 2-3 weeks. Following apparent recovery from the disease, as many as half of all infected cats may develop a carrier state in which they will continue to shed the virus. In some of these cats the carrier state may only last for a few months, but in a small percentage of cats the carrier state may persist for life. Carrier cats may or may not show any signs of infection when they are actively shedding calicivirus and serve as an important source of infection to susceptible cats. I would say it would not be safe for you to bring the kitten home for at least one month. I would also recommend re-vaccinating your old cat with the FVRCP vaccine if it has not been given in the last 6 months to boost his immunity.

If your cat isn't vaccinated against Calicivirus, then yes Kovu can get it. Make sure his vaccines are up to date, and should reduce the symptoms should your cat acquire the virus from this foster cat. How lovely of you to want to take this foster cat in!

It is true that if she has the virus, the vaccination is not likely to help much, but it is still recommended to vaccinate her as the vaccination will protect her from other diseases. There is unfortunately no known effective treatment for calicivirus, when it flares up it is recommended that the vet pute Fluffy on antibiotics and anti inflammatories.

It is possible that you could spread the disease, but if your cats are appropriately vaccinated they should have some degree of immunity to it. Keep an eye on them for changes in behavior/illness and call your veterinarian if anything changes.

That is a great question. Upper respiratory infections in cats are highly contagious. If one of your friends has a sick cat at their home, they can spread the infection to your cat if they have any contamination on their hands or clothes. Your cat can also contract an infection if they are in close enough contact to any outdoor cats that are sick, such as a sick cat sneezing near your open window, etc. You can picture children on a school setting and how easy it is to spread a virus...it is the same with cats.

I'm assuming that your cat has an upper respiratory virus like herpesvirus or calicivirus. It is fine to vaccinate cats who have been already infected, especially since this is typically a combination vaccine that covers other viruses as well. There is some evidence that the intranasal vaccine could lessen the severity of signs in a cat who is having an outbreak, but if your cat is already infected the vaccine will not cure him. If you introduced another cat and Frank became symptomatic again (i.e. sneezing, watery eyes or nasal discharge) the new cat could catch the disease. That being said, these viruses are extremely common and many kittens have been exposed even before they are vaccinated. If you are concerned you could always consider adopting an older cat who already has been vaccinated.