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Table 4 Scoring system used to determine the severity of microscopic lung lesions

From: Prevalence of mycoplasma-like lung lesions in pigs from commercial farms from Spain and Portugal

Type of pneumonia Mild
(Score 1)
Moderate
(Score 2)
Severe
(Score 3)
Bronchointerstitial pneumonia BALT in > 5 bronchi or bronchioles (1–2 BALT per structure) 1.- BALT in > 5 bronchi or bronchioles (50 % of the structure is surrounded by BALT)
or
2.- BALT in > 5 bronchi or bronchioles (1–2 BALT per structure) and one bronchus or bronchiole completely surrounded by hyperplasia of BALT
1.- At least two structures are almost completely surrounded (80 %) by hyperplasia of BALT
or
2.- All structures of the section are affected
Interstitial pneumonia 1–2 lobule/s affecteda 50 % affecteda All lobuli are affecteda
Suppurative pneumonia 1–2 lobule/s affecteda 50 % affecteda All lobuli are affecteda
Fibrinous pleuropneumonia 1–2 lobule/s affecteda 50 % affecteda All lobuli are affecteda
Pleurisy Presence --- ---
  1. The term “structure” describes a bronchus or bronchiole, equally
  2. BALT bronchus-associated lymphoid tissue
  3. aEvery evaluated section included at least 6 lobuli
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