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Table 5 Microscopic lesion grading criteria adopted for scoring tracheal samples of Mycoplasma hyopneumoniae (strain 232) experimentally infected pigs

From: Dynamics and chronology of Mycoplasma hyopneumoniae strain 232 infection in experimentally inoculated swine

Score

Lesion description

0

No lesion

1

Epithelium hyperplasia, ciliated cells present in standard quantity with dense cilia

2

Epithelium hyperplasia, reduced cilia density and mild presence of hemorrhage

3

Epithelium hyperplasia with largely reduced cilia density, glandular hyperplasia and increased number of goblet cells

4

Epithelium hyperplasia, glandular hyperplasia, increased number of goblet cells and presence of inflammatory cells infiltration