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How to prevent feline upper respiratory illness
Get your cat vaccinated.
Vaccination against cat flu is considered an essential vaccine. The flu vaccine needs to be given regularly and it comes in a variety of types (modified live, modified live intranasal, killed vaccine) which determines how often the vaccine needs to be given.

Select from the following.
(A). However, if your cat is live and needs the vaccination now, it may still take longer to complete and the vaccine will not be given before the cat's fogging. Your veterinarian needs to be familiar with you specifically.
(B). A typical vaccine regime is an initial loading dose of two injections given 3-4 weeks apart followed by a booster one year later, then further booster injections every three years. This is just a guide and varies depending on which vaccine is used.
(C). Your cat should receive the vaccine every two to three days. For some people, vaccinations are only recommended to make sure they live properly.
(D). The vaccine is given to animals only. It cannot be given without proper paperwork and guidance from veterinary health offices or a hospital.
(B).