Table 1.
Grading of the pulmonary lesions.
| Type of lesion |
Number of cases |
||
|---|---|---|---|
| EIAV pos | EIAV neg | ||
|
[A]
Lymphocyte infiltration |
Absence: |
14
|
11 |
| Presence: |
65
|
3 |
|
| |
Grade: |
|
|
|
[B]
(Peri)bronchiolar inflammation |
0 |
15
|
11 |
| I |
41
|
3 |
|
| II |
17
|
0 |
|
| III |
5
|
0 |
|
| IV |
1
|
0 |
|
|
[C]
Thickness of the septa |
0 |
24 |
13 |
| I |
34 |
1 |
|
| II |
21 |
0 |
|
| III |
0 |
0 |
|
| |
Histological score
* [(B + C)/2]
|
||
| No lesions |
0 (0–0.4) |
13 |
11 |
| Mild lesions |
I (0.5-1.4) |
35 |
3 |
| Moderate lesions |
II (1.5-2.4) |
27 |
0 |
| Severe lesions |
III (>2.4) |
4 |
0 |
| Mean score: | 1.09 | 0.17 | |
Pulmonary lesions have been blindly observed and graded according to their severity from EIAV-positive (EIAVPOS) and EIAVnegative (EIAVNEG) horses. [A] described the presence of infiltrating lymphocytes. [B] described the type and the severity of (peri) bronchiolar inflammation; [C] described the thickness of the septa and its severity; * total histological score was calculated using the [(B + C)/2] formula. The histological score allows the ranking of the pulmonary disease where 0 to 0.4 means no lesions, 0.5-1.4 mild lesions, 1.5-2.4 moderate lesions and >2.4 severe lesions.