Together, they have this claim over the asset value of the business because they represent the funders of the business with Liabilities representing the external funders (banks, suppliers) and Owners Equity representing the internal funders (investors).
The red stain indicates areas of rabies viral antigen by using IHC or avidin-biotin complex (ABC) technique. Rabies in the horse is a relatively uncommon viral disease. Rabies is an acute viral encephalomyelitis that principally affects carnivores and bats, although it can affect any mammal. It is invariably fatal once clinical signs appear.
Your concerns are valid about them potentially having pneumonia. Most of the time horses with nasal discharge do just have a simple upper respiratory infection which is usually of little significance. Less frequently, it is a lower respiratory infection (pneumonia). However, pneumonia is a serious illness in horses and is potentially life-threatening.