How long does feline influenza last?

The length of time feline influenza lasts can vary depending on the severity of the infection and the individual cat's immune system. Mild cases may only last a few days to a week, while more severe cases can last for several weeks. In some cases, cats may develop chronic respiratory problems that can last for months or even years. It is important to take your cat to the vet if they are showing any signs of feline influenza so that they can be properly diagnosed and treated.