Table 2. Clinical scores.

Clinical category	Clinical signs	Score
Ocular/nasal discharge	Normal, slightly serous	0
	Copius serous	1
	Slightly mucopurulent	2
	Moderately mucopurulent	3
Coughing	Normal	0
	Single episode	1
	Two episodes	2
	≥Three episodes	3
	Daily respiratory disease score per horse	0–6
CNS	Normal	0
	Reduced tail muscle tone	1
	Mild – moderate ataxia: Mayhew* ataxia grade 1–2	2
	Severe ataxia – recumbency: Mayhew* ataxia grade 3–5	3
	Daily neurological disease score per horse	0–3

*Mayhew et al. [53].