This is a test of commonsense. Complete the next sentence:

How to diagnose respiratory problems in rabbits
Look for nasal discharge.
The most common respiratory problem is' snuffles ,' a disease that causes upper respiratory tract infections with a nasal discharge. The classic pasteurella infection discharge is a thick, creamy white discharge from the nostrils.
However the discharge can be anything from watery to white to yellow. Pasteurella is so commonly a cause of ill health because many rabbits have it in their respiratory tract as a normal inhabitant.