WebMD Veterinary Reference https://pets.webmd.com/cats/feline-herpes-symptoms-treatment#1

Sneezing, congestion, watery eyes and nose.... Has one of your cats caught a cold? It could be feline herpes, also known as feline viral rhinopneumonitis (FVR), rhinotracheitis virus and feline herpesvirus type 1 (FHV-1), and one of the most common causes of upper respiratory infections in cats. Many cats are exposed to this virus at some point in their lives.