Every day, your horse’s respiratory tract is challenged by pathogens, such as bacteria, viruses and fungal elements. In the majority of cases, your horse’s immune system and defence mechanisms easily overcome these small challenges without any external symptoms. Some mes, however, when the challenge is too great or the defence mechanisms are overwhelmed, clinical infec on and symptoms can result.
The anatomy of the respiratory tract has already been discussed in Part One of this series, but will be described in greater detail below in relation to special conditons.
