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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