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Table 1 Grading of the pulmonary lesions.

From: Interstitial lung disease associated with Equine Infectious Anemia Virus infection in horses

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
  1. 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.