There are two common forms of FIP: a ‘wet’ form and a ‘dry’ form. 
In both forms, the clinical signs vary depending on the involved organs, such as the peritoneum, pleurae, liver, kidneys, central nervous system (CNS), and eyes. 

FIP causes immune-mediated vasculitis, meaning that blood vessels of any organ can be affected with clinical signs resulting from the damage to the affected organ. In the ‘wet’ form the damage is greater and is more rapidly fatal than the ‘dry’ form.

  1. ‘Wet’ (Effusive) form, obvious thick yellow fluids build up in the cat’s belly or chest. The disease usually develops within 4-6 weeks from infection and often follows a stress, such as re-homing or vaccination. 
  2. ‘Dry’ (Un-effusive) form’s clinical signs are usually vague, including weight loss, lack of energy, and appetite. The disease develops over a longer period, potentially even a year, but usually takes a toll within several weeks to a few months.

Clinical work-up of different signs will be presented in a case oriented approach in attached to this lesson presentation. 
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